为什么我们需要 LadderScript
LadderScript 旨在通过为梯形图提供一种标准、易读的文本格式来解决这个问题。
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在 PLC 编程中，管理梯形图（Ladder Logic）文件可能很棘手。不同的 PLC 厂商以各种格式存储其文件，通常使用二进制文件，这使得 Git 等版本控制工具难以使用。有些厂商提供 XML 导出，但这些格式仍然难以阅读和处理。LadderScript 旨在通过为梯形图提供一种标准、易读的文本格式来解决这个问题。
1、不同 PLC 厂商如何存储梯形图
1.1 二进制格式
大多数 PLC 厂商使用二进制格式存储其项目文件。这使得版本控制工具难以使用，因为二进制文件不易比较或合并。这与传统软件开发中基于文本的代码为常态的做法截然不同。
1.2 XML 格式
有些厂商允许以 XML 格式导出项目，这更好一些，但仍不理想。每家厂商使用不同的 XML 格式，而且这些文件通常难以阅读。下面是一些不同 PLC 厂商如何以 XML 存储项目文件的示例。
1.3 PLCopenXML
PLCopen XML 试图为以 XML 存储梯形图制定标准。虽然它比二进制更好，但仍然复杂且难以阅读。
<FunctionBlock name="LD_FB">
<Parameters>
<OutputVars>
<Variable name="Output" orderWithinParamSet="1">
<Type>
<TypeName>BOOL</TypeName>
</Type>
</Variable>
</OutputVars>
</Parameters>
<Vars accessSpecifier="private">
<Variable name="S1">
<Type>
<TypeName>BOOL</TypeName>
</Type>
<InitialValue>
<SimpleValue value="TRUE" />
</InitialValue>
</Variable>
<Variable name="S2">
<Type>
<TypeName>BOOL</TypeName>
</Type>
</Variable>
<Variable name="S1TON">
<Type>
<TypeName>TON</TypeName>
</Type>
</Variable>
<Variable name="S2TON">
<Type>
<TypeName>TON</TypeName>
</Type>
</Variable>
</Vars>
<MainBody>
<BodyContent xsi:type="LD">
<Rung evaluationOrder="1">
<RelPosition x="1" y="1" />
<CommonObject xsi:type="Comment">
<RelPosition x="1" y="0" />
<Content xsi:type="SimpleText">S1 -> S2</Content>
</CommonObject>
<LdObject xsi:type="LeftPowerRail">
<RelPosition x="1" y="0" />
<ConnectionPointOut connectionPointOutId="1">
<RelPosition x="0" y="7" />
</ConnectionPointOut>
<ConnectionPointOut connectionPointOutId="2">
<RelPosition x="0" y="15" />
</ConnectionPointOut>
</LdObject>
<LdObject xsi:type="Contact" operand="S1">
<RelPosition x="4" y="4" />
<ConnectionPointIn>
<RelPosition x="2" y="3" />
<Connection refConnectionPointOutId="1" />
</ConnectionPointIn>
<ConnectionPointOut connectionPointOutId="3">
<RelPosition x="4" y="3" />
</ConnectionPointOut>
</LdObject>
<FbdObject xsi:type="DataSource" identifier="T#1s">
<RelPosition x="8" y="9" />
<ConnectionPointOut connectionPointOutId="4">
<RelPosition x="4.2" y="1" />
</ConnectionPointOut>
</FbdObject>
<FbdObject xsi:type="Block" typeName="TON" instanceName="S1TON">
<RelPosition x="13" y="4" />
<InputVariables>
<InputVariable parameterName="IN">
<ConnectionPointIn>
<RelPosition x="0" y="3" />
<Connection refConnectionPointOutId="3" />
</ConnectionPointIn>
</InputVariable>
<InputVariable parameterName="PT">
<ConnectionPointIn>
<RelPosition x="0" y="6" />
<Connection refConnectionPointOutId="4" />
</ConnectionPointIn>
</InputVariable>
</InputVariables>
<OutputVariables>
<OutputVariable parameterName="Q">
<ConnectionPointOut connectionPointOutId="5">
<RelPosition x="5" y="3" />
</ConnectionPointOut>
</OutputVariable>
<OutputVariable parameterName="ET">
<ConnectionPointOut connectionPointOutId="6">
<RelPosition x="5" y="6" />
</ConnectionPointOut>
</OutputVariable>
</OutputVariables>
</FbdObject>
<LdObject xsi:type="Contact" operand="S2">
<RelPosition x="4" y="12" />
<ConnectionPointIn>
<RelPosition x="2" y="3" />
<Connection refConnectionPointOutId="2"></Connection>
</ConnectionPointIn>
<ConnectionPointOut connectionPointOutId="7">
<RelPosition x="4" y="3" />
</ConnectionPointOut>
</LdObject>
<LdObject xsi:type="Coil" operand="S2">
<RelPosition x="32" y="4" />
<ConnectionPointIn>
<RelPosition x="2" y="3" />
<Connection refConnectionPointOutId="5" />
<Connection refConnectionPointOutId="7">
<RelPosition x="-10" y="0" />
<RelPosition x="-10" y="8" />
</Connection>
</ConnectionPointIn>
<ConnectionPointOut connectionPointOutId="8">
<RelPosition x="4" y="3" />
</ConnectionPointOut>
</LdObject>
<LdObject xsi:type="RightPowerRail">
<RelPosition x="40" y="0" />
<ConnectionPointIn>
<RelPosition x="0" y="7" />
<Connection refConnectionPointOutId="8" />
</ConnectionPointIn>
</LdObject>
</Rung>
<Rung evaluationOrder="2">
<RelPosition x="1" y="18" />
<LdObject xsi:type="LeftPowerRail">
<RelPosition x="1" y="0" />
<ConnectionPointOut connectionPointOutId="1">
<RelPosition x="0" y="5" />
</ConnectionPointOut>
</LdObject>
<LdObject xsi:type="Contact" negated="true" operand="S1TON.Q">
<RelPosition x="4" y="2" />
<ConnectionPointIn>
<RelPosition x="2" y="3" />
<Connection refConnectionPointOutId="1" />
</ConnectionPointIn>
<ConnectionPointOut connectionPointOutId="2">
<RelPosition x="4" y="3" />
</ConnectionPointOut>
</LdObject>
<LdObject xsi:type="Contact" operand="S1">
<RelPosition x="11" y="2" />
<ConnectionPointIn>
<RelPosition x="2" y="3" />
<Connection refConnectionPointOutId="2" />
</ConnectionPointIn>
<ConnectionPointOut connectionPointOutId="3">
<RelPosition x="4" y="3" />
</ConnectionPointOut>
</LdObject>
<LdObject xsi:type="Coil" operand="S1">
<RelPosition x="32" y="2" />
<ConnectionPointIn>
<RelPosition x="2" y="3" />
<Connection refConnectionPointOutId="3" />
</ConnectionPointIn>
<ConnectionPointOut connectionPointOutId="4">
<RelPosition x="4" y="3" />
</ConnectionPointOut>
</LdObject>
<LdObject xsi:type="RightPowerRail">
<RelPosition x="40" y="0" />
<ConnectionPointIn>
<RelPosition x="0" y="5" />
<Connection refConnectionPointOutId="4" />
</ConnectionPointIn>
</LdObject>
</Rung>
<Rung evaluationOrder="3">
<RelPosition x="1" y="26" />
<CommonObject xsi:type="Comment">
<RelPosition x="1" y="0" />
<Content xsi:type="SimpleText">S2 -> S1</Content>
</CommonObject>
<LdObject xsi:type="LeftPowerRail">
<RelPosition x="1" y="0" />
<ConnectionPointOut connectionPointOutId="1">
<RelPosition x="0" y="7" />
</ConnectionPointOut>
<ConnectionPointOut connectionPointOutId="2">
<RelPosition x="0" y="15" />
</ConnectionPointOut>
</LdObject>
<LdObject xsi:type="Contact" operand="S2">
<RelPosition x="4" y="4" />
<ConnectionPointIn>
<RelPosition x="2" y="3" />
<Connection refConnectionPointOutId="1" />
</ConnectionPointIn>
<ConnectionPointOut connectionPointOutId="3">
<RelPosition x="4" y="3" />
</ConnectionPointOut>
</LdObject>
<FbdObject xsi:type="DataSource" identifier="T#1s">
<RelPosition x="8" y="9" />
<ConnectionPointOut connectionPointOutId="4">
<RelPosition x="4.2" y="1" />
</ConnectionPointOut>
</FbdObject>
<FbdObject xsi:type="Block" typeName="TON" instanceName="S2TON">
<RelPosition x="13" y="4" />
<InputVariables>
<InputVariable parameterName="IN">
<ConnectionPointIn>
<RelPosition x="0" y="3" />
<Connection refConnectionPointOutId="3" />
</ConnectionPointIn>
</InputVariable>
<InputVariable parameterName="PT">
<ConnectionPointIn>
<RelPosition x="0" y="6" />
<Connection refConnectionPointOutId="4" />
</ConnectionPointIn>
</InputVariable>
</InputVariables>
<OutputVariables>
<OutputVariable parameterName="Q">
<ConnectionPointOut connectionPointOutId="5">
<RelPosition x="5" y="3" />
</ConnectionPointOut>
</OutputVariable>
<OutputVariable parameterName="ET">
<ConnectionPointOut connectionPointOutId="6">
<RelPosition x="5" y="6" />
</ConnectionPointOut>
</OutputVariable>
</OutputVariables>
</FbdObject>
<LdObject xsi:type="Contact" operand="S1">
<RelPosition x="4" y="12" />
<ConnectionPointIn>
<RelPosition x="2" y="3" />
<Connection refConnectionPointOutId="2"></Connection>
</ConnectionPointIn>
<ConnectionPointOut connectionPointOutId="7">
<RelPosition x="4" y="3" />
</ConnectionPointOut>
</LdObject>
<LdObject xsi:type="Coil" operand="S1">
<RelPosition x="32" y="4" />
<ConnectionPointIn>
<RelPosition x="2" y="3" />
<Connection refConnectionPointOutId="5" />
<Connection refConnectionPointOutId="7">
<RelPosition x="-10" y="0" />
<RelPosition x="-10" y="8" />
</Connection>
</ConnectionPointIn>
<ConnectionPointOut connectionPointOutId="8">
<RelPosition x="4" y="3" />
</ConnectionPointOut>
</LdObject>
<LdObject xsi:type="RightPowerRail">
<RelPosition x="40" y="0" />
<ConnectionPointIn>
<RelPosition x="0" y="7" />
<Connection refConnectionPointOutId="8" />
</ConnectionPointIn>
</LdObject>
</Rung>
<Rung evaluationOrder="4">
<RelPosition x="1" y="43" />
<LdObject xsi:type="LeftPowerRail">
<RelPosition x="1" y="0" />
<ConnectionPointOut connectionPointOutId="1">
<RelPosition x="0" y="5" />
</ConnectionPointOut>
</LdObject>
<LdObject xsi:type="Contact" negated="true" operand="S2TON.Q">
<RelPosition x="4" y="2" />
<ConnectionPointIn>
<RelPosition x="2" y="3" />
<Connection refConnectionPointOutId="1" />
</ConnectionPointIn>
<ConnectionPointOut connectionPointOutId="2">
<RelPosition x="4" y="3" />
</ConnectionPointOut>
</LdObject>
<LdObject xsi:type="Contact" operand="S2">
<RelPosition x="11" y="2" />
<ConnectionPointIn>
<RelPosition x="2" y="3" />
<Connection refConnectionPointOutId="2" />
</ConnectionPointIn>
<ConnectionPointOut connectionPointOutId="3">
<RelPosition x="4" y="3" />
</ConnectionPointOut>
</LdObject>
<LdObject xsi:type="Coil" operand="S2">
<RelPosition x="32" y="2" />
<ConnectionPointIn>
<RelPosition x="2" y="3" />
<Connection refConnectionPointOutId="3" />
</ConnectionPointIn>
<ConnectionPointOut connectionPointOutId="4">
<RelPosition x="4" y="3" />
</ConnectionPointOut>
</LdObject>
<LdObject xsi:type="RightPowerRail">
<RelPosition x="40" y="0" />
<ConnectionPointIn>
<RelPosition x="0" y="5" />
<Connection refConnectionPointOutId="4" />
</ConnectionPointIn>
</LdObject>
</Rung>
<Rung evaluationOrder="5">
<RelPosition x="1" y="51" />
<CommonObject xsi:type="Comment">
<RelPosition x="1" y="0" />
<Content xsi:type="SimpleText">Output</Content>
</CommonObject>
<LdObject xsi:type="LeftPowerRail">
<RelPosition x="1" y="0" />
<ConnectionPointOut connectionPointOutId="1">
<RelPosition x="0" y="5" />
</ConnectionPointOut>
</LdObject>
<LdObject xsi:type="Contact" operand="S1">
<RelPosition x="4" y="2" />
<ConnectionPointIn>
<RelPosition x="2" y="3" />
<Connection refConnectionPointOutId="1" />
</ConnectionPointIn>
<ConnectionPointOut connectionPointOutId="2">
<RelPosition x="4" y="3" />
</ConnectionPointOut>
</LdObject>
<LdObject xsi:type="Coil" operand="Output">
<RelPosition x="32" y="2" />
<ConnectionPointIn>
<RelPosition x="2" y="3" />
<Connection refConnectionPointOutId="2" />
</ConnectionPointIn>
<ConnectionPointOut connectionPointOutId="3">
<RelPosition x="4" y="3" />
</ConnectionPointOut>
</LdObject>
<LdObject xsi:type="RightPowerRail">
<RelPosition x="40" y="0" />
<ConnectionPointIn>
<RelPosition x="0" y="5" />
<Connection refConnectionPointOutId="3" />
</ConnectionPointIn>
</LdObject>
</Rung>
</BodyContent>
</MainBody>
</FunctionBlock>
2、Codesys
Codesys 使用 PLCopenXML 进行导出，但结构有所不同。例如，元素位置值始终为 0，这意味着它们可能被编辑器忽略。
<pou name="PLC_PRG" pouType="program">
<interface>
<localVars>
<variable name="S1">
<type>
<BOOL />
</type>
</variable>
<variable name="S2">
<type>
<BOOL />
</type>
</variable>
<variable name="S1TON">
<type>
<derived name="TON" />
</type>
</variable>
<variable name="S2TON">
<type>
<derived name="TON" />
</type>
</variable>
</localVars>
<outputVars>
<variable name="Output">
<type>
<BOOL />
</type>
</variable>
</outputVars>
</interface>
<body>
<LD>
<leftPowerRail localId="0">
<position x="0" y="0" />
<connectionPointOut formalParameter="none" />
</leftPowerRail>
<comment localId="1" height="0" width="0">
<position x="0" y="0" />
<content>
<xhtml xmlns="http://www.w3.org/1999/xhtml" />
</content>
</comment>
<vendorElement localId="2">
<position x="0" y="0" />
<alternativeText>
<xhtml xmlns="http://www.w3.org/1999/xhtml" />
</alternativeText>
<addData>
<data name="http://www.3s-software.com/plcopenxml/fbdelementtype" handleUnknown="implementation">
<ElementType xmlns="">networktitle</ElementType>
</data>
</addData>
</vendorElement>
<contact localId="5" negated="false" storage="none" edge="none">
<position x="0" y="0" />
<connectionPointIn>
<connection refLocalId="0" />
</connectionPointIn>
<connectionPointOut />
<variable>S1</variable>
</contact>
<inVariable localId="6">
<position x="0" y="0" />
<connectionPointOut />
<expression>T#1S</expression>
</inVariable>
<block localId="4" typeName="TON" instanceName="S1TON">
<position x="0" y="0" />
<inputVariables>
<variable formalParameter="IN">
<connectionPointIn>
<connection refLocalId="5" />
</connectionPointIn>
</variable>
<variable formalParameter="PT">
<connectionPointIn>
<connection refLocalId="6" />
</connectionPointIn>
</variable>
</inputVariables>
<inOutVariables />
<outputVariables>
<variable formalParameter="Q">
<connectionPointOut />
</variable>
<variable formalParameter="ET">
<connectionPointOut>
<expression />
</connectionPointOut>
</variable>
</outputVariables>
<addData>
<data name="http://www.3s-software.com/plcopenxml/fbdcalltype" handleUnknown="implementation">
<CallType xmlns="">functionblock</CallType>
</data>
</addData>
</block>
<contact localId="7" negated="false" storage="none" edge="none">
<position x="0" y="0" />
<connectionPointIn>
<connection refLocalId="0" />
</connectionPointIn>
<connectionPointOut />
<variable>S2</variable>
</contact>
<vendorElement localId="3">
<position x="0" y="0" />
<alternativeText>
<xhtml xmlns="http://www.w3.org/1999/xhtml">ParallelBranch</xhtml>
</alternativeText>
<addData>
<data name="http://www.3s-software.com/plcopenxml/ldparallelbranch" handleUnknown="implementation">
<ParallelBranch mode="seq" xmlns="">
<BranchInput>
<connectionPointIn>
<connection refLocalId="0" />
</connectionPointIn>
</BranchInput>
<BranchTrees>
<Tree>
<connectionPointIn>
<connection refLocalId="4" formalParameter="Q" />
</connectionPointIn>
</Tree>
<Tree>
<connectionPointIn>
<connection refLocalId="7" />
</connectionPointIn>
</Tree>
</BranchTrees>
</ParallelBranch>
</data>
</addData>
</vendorElement>
<coil localId="8" negated="false" storage="none">
<position x="0" y="0" />
<connectionPointIn>
<connection refLocalId="4" />
<connection refLocalId="7" />
</connectionPointIn>
<connectionPointOut />
<variable>S2</variable>
</coil>
<comment localId="9" height="0" width="0">
<position x="0" y="0" />
<content>
<xhtml xmlns="http://www.w3.org/1999/xhtml" />
</content>
</comment>
<vendorElement localId="10">
<position x="0" y="0" />
<alternativeText>
<xhtml xmlns="http://www.w3.org/1999/xhtml" />
</alternativeText>
<addData>
<data name="http://www.3s-software.com/plcopenxml/fbdelementtype" handleUnknown="implementation">
<ElementType xmlns="">networktitle</ElementType>
</data>
</addData>
</vendorElement>
<contact localId="11" negated="true" storage="none" edge="none">
<position x="0" y="0" />
<connectionPointIn>
<connection refLocalId="0" />
</connectionPointIn>
<connectionPointOut />
<variable>S1TON.Q</variable>
</contact>
<contact localId="12" negated="false" storage="none" edge="none">
<position x="0" y="0" />
<connectionPointIn>
<connection refLocalId="11" />
</connectionPointIn>
<connectionPointOut />
<variable>S1</variable>
</contact>
<coil localId="13" negated="false" storage="none">
<position x="0" y="0" />
<connectionPointIn>
<connection refLocalId="12" />
</connectionPointIn>
<connectionPointOut />
<variable>S1</variable>
</coil>
<comment localId="14" height="0" width="0">
<position x="0" y="0" />
<content>
<xhtml xmlns="http://www.w3.org/1999/xhtml" />
</content>
</comment>
<vendorElement localId="15">
<position x="0" y="0" />
<alternativeText>
<xhtml xmlns="http://www.w3.org/1999/xhtml" />
</alternativeText>
<addData>
<data name="http://www.3s-software.com/plcopenxml/fbdelementtype" handleUnknown="implementation">
<ElementType xmlns="">networktitle</ElementType>
</data>
</addData>
</vendorElement>
<contact localId="17" negated="false" storage="none" edge="none">
<position x="0" y="0" />
<connectionPointIn>
<connection refLocalId="0" />
</connectionPointIn>
<connectionPointOut />
<variable>S2</variable>
</contact>
<inVariable localId="18">
<position x="0" y="0" />
<connectionPointOut />
<expression>T#1S</expression>
</inVariable>
<block localId="16" typeName="TON" instanceName="S2TON">
<position x="0" y="0" />
<inputVariables>
<variable formalParameter="IN">
<connectionPointIn>
<connection refLocalId="17" />
</connectionPointIn>
</variable>
<variable formalParameter="PT">
<connectionPointIn>
<connection refLocalId="18" />
</connectionPointIn>
</variable>
</inputVariables>
<inOutVariables />
<outputVariables>
<variable formalParameter="Q">
<connectionPointOut />
</variable>
<variable formalParameter="ET">
<connectionPointOut>
<expression />
</connectionPointOut>
</variable>
</outputVariables>
<addData>
<data name="http://www.3s-software.com/plcopenxml/fbdcalltype" handleUnknown="implementation">
<CallType xmlns="">functionblock</CallType>
</data>
</addData>
</block>
<contact localId="19" negated="false" storage="none" edge="none">
<position x="0" y="0" />
<connectionPointIn>
<connection refLocalId="0" />
</connectionPointIn>
<connectionPointOut />
<variable>S1</variable>
</contact>
<coil localId="20" negated="false" storage="none">
<position x="0" y="0" />
<connectionPointIn>
<connection refLocalId="16" />
<connection refLocalId="19" />
</connectionPointIn>
<connectionPointOut />
<variable>S1</variable>
</coil>
<comment localId="21" height="0" width="0">
<position x="0" y="0" />
<content>
<xhtml xmlns="http://www.w3.org/1999/xhtml" />
</content>
</comment>
<vendorElement localId="22">
<position x="0" y="0" />
<alternativeText>
<xhtml xmlns="http://www.w3.org/1999/xhtml" />
</alternativeText>
<addData>
<data name="http://www.3s-software.com/plcopenxml/fbdelementtype" handleUnknown="implementation">
<ElementType xmlns="">networktitle</ElementType>
</data>
</addData>
</vendorElement>
<contact localId="23" negated="true" storage="none" edge="none">
<position x="0" y="0" />
<connectionPointIn>
<connection refLocalId="0" />
</connectionPointIn>
<connectionPointOut />
<variable>S2TON.Q</variable>
</contact>
<contact localId="24" negated="false" storage="none" edge="none">
<position x="0" y="0" />
<connectionPointIn>
<connection refLocalId="23" />
</connectionPointIn>
<connectionPointOut />
<variable>S2</variable>
</contact>
<coil localId="25" negated="false" storage="none">
<position x="0" y="0" />
<connectionPointIn>
<connection refLocalId="24" />
</connectionPointIn>
<connectionPointOut />
<variable>S2</variable>
</coil>
<comment localId="26" height="0" width="0">
<position x="0" y="0" />
<content>
<xhtml xmlns="http://www.w3.org/1999/xhtml" />
</content>
</comment>
<vendorElement localId="27">
<position x="0" y="0" />
<alternativeText>
<xhtml xmlns="http://www.w3.org/1999/xhtml" />
</alternativeText>
<addData>
<data name="http://www.3s-software.com/plcopenxml/fbdelementtype" handleUnknown="implementation">
<ElementType xmlns="">networktitle</ElementType>
</data>
</addData>
</vendorElement>
<contact localId="28" negated="false" storage="none" edge="none">
<position x="0" y="0" />
<connectionPointIn>
<connection refLocalId="0" />
</connectionPointIn>
<connectionPointOut />
<variable>S1</variable>
</contact>
<coil localId="29" negated="false" storage="none">
<position x="0" y="0" />
<connectionPointIn>
<connection refLocalId="28" />
</connectionPointIn>
<connectionPointOut />
<variable>Output</variable>
</coil>
<rightPowerRail localId="2147483646">
<position x="0" y="0" />
<connectionPointIn />
</rightPowerRail>
</LD>
</body>
<addData>
<data name="http://www.3s-software.com/plcopenxml/objectid" handleUnknown="discard">
<ObjectId>6b7e38b6-d20c-49d8-8996-c2bab4f21546</ObjectId>
</data>
</addData>
</pou>
3、Siemens TIA Portal
西门子 TIA Portal 有一个版本控制工作区，程序文件以 XML 存储，提供了一种结构化但复杂的格式。
<?xml version="1.0" encoding="utf-8"?>
<Document>
<Engineering version="V17" />
<DocumentInfo>
<Created>2024-06-24T19:29:50.1427684Z</Created>
<ExportSetting>WithDefaults</ExportSetting>
<InstalledProducts>
<Product>
<DisplayName>Totally Integrated Automation Portal</DisplayName>
<DisplayVersion>V17 Update 6</DisplayVersion>
</Product>
<OptionPackage>
<DisplayName>TIA Portal Openness</DisplayName>
<DisplayVersion>V17 Update 6</DisplayVersion>
</OptionPackage>
<OptionPackage>
<DisplayName>TIA Portal Teamcenter Gateway</DisplayName>
<DisplayVersion>V17 Update 6</DisplayVersion>
</OptionPackage>
<OptionPackage>
<DisplayName>TIA Portal Version Control Interface</DisplayName>
<DisplayVersion>V17</DisplayVersion>
</OptionPackage>
<Product>
<DisplayName>STEP 7 Professional</DisplayName>
<DisplayVersion>V17 Update 6</DisplayVersion>
</Product>
<OptionPackage>
<DisplayName>STEP 7 Safety</DisplayName>
<DisplayVersion>V17 Update 6</DisplayVersion>
</OptionPackage>
<Product>
<DisplayName>WinCC Advanced / Unified PC</DisplayName>
<DisplayVersion>V17 Update 6</DisplayVersion>
</Product>
</InstalledProducts>
</DocumentInfo>
<SW.Blocks.FB ID="0">
<AttributeList>
<AutoNumber>true</AutoNumber>
<HeaderAuthor />
<HeaderFamily />
<HeaderName />
<HeaderVersion>0.1</HeaderVersion>
<Interface><Sections xmlns="http://www.siemens.com/automation/Openness/SW/Interface/v5">
<Section Name="Input" />
<Section Name="Output">
<Member Name="Output" Datatype="Bool" Remanence="NonRetain" Accessibility="Public"><AttributeList><BooleanAttribute Name="ExternalAccessible" SystemDefined="true">true</BooleanAttribute><BooleanAttribute Name="ExternalVisible" SystemDefined="true">true</BooleanAttribute><BooleanAttribute Name="ExternalWritable" SystemDefined="true">true</BooleanAttribute></AttributeList></Member>
</Section>
<Section Name="InOut" />
<Section Name="Static">
<Member Name="S1TON" Datatype="TON_TIME" Version="1.0" Remanence="NonRetain" Accessibility="Public"><AttributeList><BooleanAttribute Name="ExternalAccessible" SystemDefined="true">true</BooleanAttribute><BooleanAttribute Name="ExternalVisible" SystemDefined="true">true</BooleanAttribute><BooleanAttribute Name="ExternalWritable" SystemDefined="true">true</BooleanAttribute><BooleanAttribute Name="SetPoint" SystemDefined="true">true</BooleanAttribute></AttributeList><Sections><Section Name="None"><Member Name="PT" Datatype="Time" /><Member Name="ET" Datatype="Time" /><Member Name="IN" Datatype="Bool" /><Member Name="Q" Datatype="Bool" /></Section></Sections></Member>
<Member Name="S2TON" Datatype="TON_TIME" Version="1.0" Remanence="NonRetain" Accessibility="Public"><AttributeList><BooleanAttribute Name="ExternalAccessible" SystemDefined="true">true</BooleanAttribute><BooleanAttribute Name="ExternalVisible" SystemDefined="true">true</BooleanAttribute><BooleanAttribute Name="ExternalWritable" SystemDefined="true">true</BooleanAttribute><BooleanAttribute Name="SetPoint" SystemDefined="true">true</BooleanAttribute></AttributeList><Sections><Section Name="None"><Member Name="PT" Datatype="Time" /><Member Name="ET" Datatype="Time" /><Member Name="IN" Datatype="Bool" /><Member Name="Q" Datatype="Bool" /></Section></Sections></Member>
<Member Name="S1" Datatype="Bool" Remanence="NonRetain" Accessibility="Public"><AttributeList><BooleanAttribute Name="ExternalAccessible" SystemDefined="true">false</BooleanAttribute><BooleanAttribute Name="ExternalVisible" SystemDefined="true">false</BooleanAttribute><BooleanAttribute Name="ExternalWritable" SystemDefined="true">false</BooleanAttribute><BooleanAttribute Name="SetPoint" SystemDefined="true">false</BooleanAttribute></AttributeList></Member>
<Member Name="S2" Datatype="Bool" Remanence="NonRetain" Accessibility="Public"><AttributeList><BooleanAttribute Name="ExternalAccessible" SystemDefined="true">false</BooleanAttribute><BooleanAttribute Name="ExternalVisible" SystemDefined="true">false</BooleanAttribute><BooleanAttribute Name="ExternalWritable" SystemDefined="true">false</BooleanAttribute><BooleanAttribute Name="SetPoint" SystemDefined="true">false</BooleanAttribute></AttributeList></Member>
</Section>
<Section Name="Temp" />
<Section Name="Constant" />
</Sections></Interface>
<IsIECCheckEnabled>false</IsIECCheckEnabled>
<IsRetainMemResEnabled>false</IsRetainMemResEnabled>
<MemoryLayout>Optimized</MemoryLayout>
<MemoryReserve>100</MemoryReserve>
<Name>PLC_PRG</Name>
<Number>3</Number>
<ProgrammingLanguage>LAD</ProgrammingLanguage>
<SetENOAutomatically>false</SetENOAutomatically>
<UDABlockProperties />
<UDAEnableTagReadback>false</UDAEnableTagReadback>
</AttributeList>
<ObjectList>
<MultilingualText ID="1" CompositionName="Comment">
<ObjectList>
<MultilingualTextItem ID="2" CompositionName="Items">
<AttributeList>
<Culture>en-US</Culture>
<Text />
</AttributeList>
</MultilingualTextItem>
</ObjectList>
</MultilingualText>
<SW.Blocks.CompileUnit ID="3" CompositionName="CompileUnits">
<AttributeList>
<NetworkSource><FlgNet xmlns="http://www.siemens.com/automation/Openness/SW/NetworkSource/FlgNet/v4">
<Parts>
<Access Scope="LocalVariable" UId="21">
<Symbol>
<Component Name="S1" />
</Symbol>
</Access>
<Access Scope="TypedConstant" UId="22">
<Constant>
<ConstantValue>T#1s</ConstantValue>
</Constant>
</Access>
<Access Scope="LocalVariable" UId="23">
<Symbol>
<Component Name="S2" />
</Symbol>
</Access>
<Access Scope="LocalVariable" UId="24">
<Symbol>
<Component Name="S2" />
</Symbol>
</Access>
<Part Name="Contact" UId="25" />
<Part Name="TON" Version="1.0" UId="26">
<Instance Scope="LocalVariable" UId="27">
<Component Name="S1TON" />
</Instance>
<TemplateValue Name="time_type" Type="Type">Time</TemplateValue>
</Part>
<Part Name="Contact" UId="28" />
<Part Name="O" UId="29">
<TemplateValue Name="Card" Type="Cardinality">2</TemplateValue>
</Part>
<Part Name="Coil" UId="30" />
</Parts>
<Wires>
<Wire UId="32">
<Powerrail />
<NameCon UId="25" Name="in" />
<NameCon UId="28" Name="in" />
</Wire>
<Wire UId="33">
<IdentCon UId="21" />
<NameCon UId="25" Name="operand" />
</Wire>
<Wire UId="34">
<NameCon UId="25" Name="out" />
<NameCon UId="26" Name="IN" />
</Wire>
<Wire UId="35">
<IdentCon UId="22" />
<NameCon UId="26" Name="PT" />
</Wire>
<Wire UId="36">
<NameCon UId="26" Name="Q" />
<NameCon UId="29" Name="in1" />
</Wire>
<Wire UId="37">
<NameCon UId="26" Name="ET" />
<OpenCon UId="31" />
</Wire>
<Wire UId="38">
<IdentCon UId="23" />
<NameCon UId="28" Name="operand" />
</Wire>
<Wire UId="39">
<NameCon UId="28" Name="out" />
<NameCon UId="29" Name="in2" />
</Wire>
<Wire UId="40">
<NameCon UId="29" Name="out" />
<NameCon UId="30" Name="in" />
</Wire>
<Wire UId="41">
<IdentCon UId="24" />
<NameCon UId="30" Name="operand" />
</Wire>
</Wires>
</FlgNet></NetworkSource>
<ProgrammingLanguage>LAD</ProgrammingLanguage>
</AttributeList>
<ObjectList>
<MultilingualText ID="4" CompositionName="Comment">
<ObjectList>
<MultilingualTextItem ID="5" CompositionName="Items">
<AttributeList>
<Culture>en-US</Culture>
<Text />
</AttributeList>
</MultilingualTextItem>
</ObjectList>
</MultilingualText>
<MultilingualText ID="6" CompositionName="Title">
<ObjectList>
<MultilingualTextItem ID="7" CompositionName="Items">
<AttributeList>
<Culture>en-US</Culture>
<Text />
</AttributeList>
</MultilingualTextItem>
</ObjectList>
</MultilingualText>
</ObjectList>
</SW.Blocks.CompileUnit>
<SW.Blocks.CompileUnit ID="8" CompositionName="CompileUnits">
<AttributeList>
<NetworkSource><FlgNet xmlns="http://www.siemens.com/automation/Openness/SW/NetworkSource/FlgNet/v4">
<Parts>
<Access Scope="LocalVariable" UId="21">
<Symbol>
<Component Name="S1TON" />
<Component Name="Q" />
</Symbol>
</Access>
<Access Scope="LocalVariable" UId="22">
<Symbol>
<Component Name="S1" />
</Symbol>
</Access>
<Access Scope="LocalVariable" UId="23">
<Symbol>
<Component Name="S1" />
</Symbol>
</Access>
<Part Name="Contact" UId="24">
<Negated Name="operand" />
</Part>
<Part Name="Contact" UId="25" />
<Part Name="Coil" UId="26" />
</Parts>
<Wires>
<Wire UId="27">
<Powerrail />
<NameCon UId="24" Name="in" />
</Wire>
<Wire UId="28">
<IdentCon UId="21" />
<NameCon UId="24" Name="operand" />
</Wire>
<Wire UId="29">
<NameCon UId="24" Name="out" />
<NameCon UId="25" Name="in" />
</Wire>
<Wire UId="30">
<IdentCon UId="22" />
<NameCon UId="25" Name="operand" />
</Wire>
<Wire UId="31">
<NameCon UId="25" Name="out" />
<NameCon UId="26" Name="in" />
</Wire>
<Wire UId="32">
<IdentCon UId="23" />
<NameCon UId="26" Name="operand" />
</Wire>
</Wires>
</FlgNet></NetworkSource>
<ProgrammingLanguage>LAD</ProgrammingLanguage>
</AttributeList>
<ObjectList>
<MultilingualText ID="9" CompositionName="Comment">
<ObjectList>
<MultilingualTextItem ID="A" CompositionName="Items">
<AttributeList>
<Culture>en-US</Culture>
<Text />
</AttributeList>
</MultilingualTextItem>
</ObjectList>
</MultilingualText>
<MultilingualText ID="B" CompositionName="Title">
<ObjectList>
<MultilingualTextItem ID="C" CompositionName="Items">
<AttributeList>
<Culture>en-US</Culture>
<Text />
</AttributeList>
</MultilingualTextItem>
</ObjectList>
</MultilingualText>
</ObjectList>
</SW.Blocks.CompileUnit>
<SW.Blocks.CompileUnit ID="D" CompositionName="CompileUnits">
<AttributeList>
<NetworkSource><FlgNet xmlns="http://www.siemens.com/automation/Openness/SW/NetworkSource/FlgNet/v4">
<Parts>
<Access Scope="LocalVariable" UId="21">
<Symbol>
<Component Name="S2" />
</Symbol>
</Access>
<Access Scope="TypedConstant" UId="22">
<Constant>
<ConstantValue>T#1s</ConstantValue>
</Constant>
</Access>
<Access Scope="LocalVariable" UId="23">
<Symbol>
<Component Name="S1" />
</Symbol>
</Access>
<Access Scope="LocalVariable" UId="24">
<Symbol>
<Component Name="S1" />
</Symbol>
</Access>
<Part Name="Contact" UId="25" />
<Part Name="TON" Version="1.0" UId="26">
<Instance Scope="LocalVariable" UId="27">
<Component Name="S2TON" />
</Instance>
<TemplateValue Name="time_type" Type="Type">Time</TemplateValue>
</Part>
<Part Name="Contact" UId="28" />
<Part Name="O" UId="29">
<TemplateValue Name="Card" Type="Cardinality">2</TemplateValue>
</Part>
<Part Name="Coil" UId="30" />
</Parts>
<Wires>
<Wire UId="32">
<Powerrail />
<NameCon UId="25" Name="in" />
<NameCon UId="28" Name="in" />
</Wire>
<Wire UId="33">
<IdentCon UId="21" />
<NameCon UId="25" Name="operand" />
</Wire>
<Wire UId="34">
<NameCon UId="25" Name="out" />
<NameCon UId="26" Name="IN" />
</Wire>
<Wire UId="35">
<IdentCon UId="22" />
<NameCon UId="26" Name="PT" />
</Wire>
<Wire UId="36">
<NameCon UId="26" Name="Q" />
<NameCon UId="29" Name="in1" />
</Wire>
<Wire UId="37">
<NameCon UId="26" Name="ET" />
<OpenCon UId="31" />
</Wire>
<Wire UId="38">
<IdentCon UId="23" />
<NameCon UId="28" Name="operand" />
</Wire>
<Wire UId="39">
<NameCon UId="28" Name="out" />
<NameCon UId="29" Name="in2" />
</Wire>
<Wire UId="40">
<NameCon UId="29" Name="out" />
<NameCon UId="30" Name="in" />
</Wire>
<Wire UId="41">
<IdentCon UId="24" />
<NameCon UId="30" Name="operand" />
</Wire>
</Wires>
</FlgNet></NetworkSource>
<ProgrammingLanguage>LAD</ProgrammingLanguage>
</AttributeList>
<ObjectList>
<MultilingualText ID="E" CompositionName="Comment">
<ObjectList>
<MultilingualTextItem ID="F" CompositionName="Items">
<AttributeList>
<Culture>en-US</Culture>
<Text />
</AttributeList>
</MultilingualTextItem>
</ObjectList>
</MultilingualText>
<MultilingualText ID="10" CompositionName="Title">
<ObjectList>
<MultilingualTextItem ID="11" CompositionName="Items">
<AttributeList>
<Culture>en-US</Culture>
<Text />
</AttributeList>
</MultilingualTextItem>
</ObjectList>
</MultilingualText>
</ObjectList>
</SW.Blocks.CompileUnit>
<SW.Blocks.CompileUnit ID="12" CompositionName="CompileUnits">
<AttributeList>
<NetworkSource><FlgNet xmlns="http://www.siemens.com/automation/Openness/SW/NetworkSource/FlgNet/v4">
<Parts>
<Access Scope="LocalVariable" UId="21">
<Symbol>
<Component Name="S2TON" />
<Component Name="Q" />
</Symbol>
</Access>
<Access Scope="LocalVariable" UId="22">
<Symbol>
<Component Name="S2" />
</Symbol>
</Access>
<Access Scope="LocalVariable" UId="23">
<Symbol>
<Component Name="S2" />
</Symbol>
</Access>
<Part Name="Contact" UId="24">
<Negated Name="operand" />
</Part>
<Part Name="Contact" UId="25" />
<Part Name="Coil" UId="26" />
</Parts>
<Wires>
<Wire UId="27">
<Powerrail />
<NameCon UId="24" Name="in" />
</Wire>
<Wire UId="28">
<IdentCon UId="21" />
<NameCon UId="24" Name="operand" />
</Wire>
<Wire UId="29">
<NameCon UId="24" Name="out" />
<NameCon UId="25" Name="in" />
</Wire>
<Wire UId="30">
<IdentCon UId="22" />
<NameCon UId="25" Name="operand" />
</Wire>
<Wire UId="31">
<NameCon UId="25" Name="out" />
<NameCon UId="26" Name="in" />
</Wire>
<Wire UId="32">
<IdentCon UId="23" />
<NameCon UId="26" Name="operand" />
</Wire>
</Wires>
</FlgNet></NetworkSource>
<ProgrammingLanguage>LAD</ProgrammingLanguage>
</AttributeList>
<ObjectList>
<MultilingualText ID="13" CompositionName="Comment">
<ObjectList>
<MultilingualTextItem ID="14" CompositionName="Items">
<AttributeList>
<Culture>en-US</Culture>
<Text />
</AttributeList>
</MultilingualTextItem>
</ObjectList>
</MultilingualText>
<MultilingualText ID="15" CompositionName="Title">
<ObjectList>
<MultilingualTextItem ID="16" CompositionName="Items">
<AttributeList>
<Culture>en-US</Culture>
<Text />
</AttributeList>
</MultilingualTextItem>
</ObjectList>
</MultilingualText>
</ObjectList>
</SW.Blocks.CompileUnit>
<SW.Blocks.CompileUnit ID="17" CompositionName="CompileUnits">
<AttributeList>
<NetworkSource><FlgNet xmlns="http://www.siemens.com/automation/Openness/SW/NetworkSource/FlgNet/v4">
<Parts>
<Access Scope="LocalVariable" UId="21">
<Symbol>
<Component Name="S1" />
</Symbol>
</Access>
<Access Scope="LocalVariable" UId="22">
<Symbol>
<Component Name="Output" />
</Symbol>
</Access>
<Part Name="Contact" UId="23" />
<Part Name="Coil" UId="24" />
</Parts>
<Wires>
<Wire UId="25">
<Powerrail />
<NameCon UId="23" Name="in" />
</Wire>
<Wire UId="26">
<IdentCon UId="21" />
<NameCon UId="23" Name="operand" />
</Wire>
<Wire UId="27">
<NameCon UId="23" Name="out" />
<NameCon UId="24" Name="in" />
</Wire>
<Wire UId="28">
<IdentCon UId="22" />
<NameCon UId="24" Name="operand" />
</Wire>
</Wires>
</FlgNet></NetworkSource>
<ProgrammingLanguage>LAD</ProgrammingLanguage>
</AttributeList>
<ObjectList>
<MultilingualText ID="18" CompositionName="Comment">
<ObjectList>
<MultilingualTextItem ID="19" CompositionName="Items">
<AttributeList>
<Culture>en-US</Culture>
<Text />
</AttributeList>
</MultilingualTextItem>
</ObjectList>
</MultilingualText>
<MultilingualText ID="1A" CompositionName="Title">
<ObjectList>
<MultilingualTextItem ID="1B" CompositionName="Items">
<AttributeList>
<Culture>en-US</Culture>
<Text />
</AttributeList>
</MultilingualTextItem>
</ObjectList>
</MultilingualText>
</ObjectList>
</SW.Blocks.CompileUnit>
<SW.Blocks.CompileUnit ID="1C" CompositionName="CompileUnits">
<AttributeList>
<NetworkSource />
<ProgrammingLanguage>LAD</ProgrammingLanguage>
</AttributeList>
<ObjectList>
<MultilingualText ID="1D" CompositionName="Comment">
<ObjectList>
<MultilingualTextItem ID="1E" CompositionName="Items">
<AttributeList>
<Culture>en-US</Culture>
<Text />
</AttributeList>
</MultilingualTextItem>
</ObjectList>
</MultilingualText>
<MultilingualText ID="1F" CompositionName="Title">
<ObjectList>
<MultilingualTextItem ID="20" CompositionName="Items">
<AttributeList>
<Culture>en-US</Culture>
<Text />
</AttributeList>
</MultilingualTextItem>
</ObjectList>
</MultilingualText>
</ObjectList>
</SW.Blocks.CompileUnit>
<MultilingualText ID="21" CompositionName="Title">
<ObjectList>
<MultilingualTextItem ID="22" CompositionName="Items">
<AttributeList>
<Culture>en-US</Culture>
<Text />
</AttributeList>
</MultilingualTextItem>
</ObjectList>
</MultilingualText>
</ObjectList>
</SW.Blocks.FB>
</Document>
4、Rockwell Automation Studio 5000
罗克韦尔自动化 Studio 5000 提供最小的 XML 文件导出。
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<RSLogix5000Content SchemaRevision="1.0" SoftwareRevision="33.02" TargetName="PLC_PRG" TargetType="Program" ContainsContext="true" Owner="szymon.palczynski@gmail.com" ExportDate="Mon Jun 24 20:50:17 2024" ExportOptions="References NoRawData L5KData DecoratedData Context Dependencies ForceProtectedEncoding AllProjDocTrans">
<Controller Use="Context" Name="emulate">
<DataTypes Use="Context">
</DataTypes>
<Programs Use="Context">
<Program Use="Target" Name="PLC_PRG" TestEdits="false" MainRoutineName="Main" Disabled="false" UseAsFolder="false">
<Tags>
<Tag Name="Output" TagType="Base" DataType="BOOL" Radix="Decimal" Usage="Output" Constant="false" ExternalAccess="Read Only">
<Data Format="L5K">
<![CDATA[0]]>
</Data>
<Data Format="Decorated">
<DataValue DataType="BOOL" Radix="Decimal" Value="0"/>
</Data>
</Tag>
<Tag Name="S1" TagType="Base" DataType="BOOL" Radix="Decimal" Constant="false" ExternalAccess="Read/Write">
<Data Format="L5K">
<![CDATA[0]]>
</Data>
<Data Format="Decorated">
<DataValue DataType="BOOL" Radix="Decimal" Value="0"/>
</Data>
</Tag>
<Tag Name="S1TON" TagType="Base" DataType="TIMER" Constant="false" ExternalAccess="Read/Write">
<Data Format="L5K">
<![CDATA[[0,1000,0]]]>
</Data>
<Data Format="Decorated">
<Structure DataType="TIMER">
<DataValueMember Name="PRE" DataType="DINT" Radix="Decimal" Value="1000"/>
<DataValueMember Name="ACC" DataType="DINT" Radix="Decimal" Value="0"/>
<DataValueMember Name="EN" DataType="BOOL" Value="0"/>
<DataValueMember Name="TT" DataType="BOOL" Value="0"/>
<DataValueMember Name="DN" DataType="BOOL" Value="0"/>
</Structure>
</Data>
</Tag>
<Tag Name="S2" TagType="Base" DataType="BOOL" Radix="Decimal" Constant="false" ExternalAccess="Read/Write">
<Data Format="L5K">
<![CDATA[0]]>
</Data>
<Data Format="Decorated">
<DataValue DataType="BOOL" Radix="Decimal" Value="0"/>
</Data>
</Tag>
<Tag Name="S2TON" TagType="Base" DataType="TIMER" Constant="false" ExternalAccess="Read/Write">
<Data Format="L5K">
<![CDATA[[0,1000,0]]]>
</Data>
<Data Format="Decorated">
<Structure DataType="TIMER">
<DataValueMember Name="PRE" DataType="DINT" Radix="Decimal" Value="1000"/>
<DataValueMember Name="ACC" DataType="DINT" Radix="Decimal" Value="0"/>
<DataValueMember Name="EN" DataType="BOOL" Value="0"/>
<DataValueMember Name="TT" DataType="BOOL" Value="0"/>
<DataValueMember Name="DN" DataType="BOOL" Value="0"/>
</Structure>
</Data>
</Tag>
</Tags>
<Routines>
<Routine Name="Main" Type="RLL">
<RLLContent>
<Rung Number="0" Type="N">
<Text>
<![CDATA[[XIC(S1) TON(S1TON,?,?) XIC(S1TON.DN) ,XIC(S2) ]OTE(S2);]]>
</Text>
</Rung>
<Rung Number="1" Type="N">
<Text>
<![CDATA[XIO(S1TON.DN)XIC(S1)OTE(S1);]]>
</Text>
</Rung>
<Rung Number="2" Type="N">
<Text>
<![CDATA[[XIC(S2) TON(S2TON,?,?) XIC(S2TON.DN) ,XIC(S1) ]OTE(S1);]]>
</Text>
</Rung>
<Rung Number="3" Type="N">
<Text>
<![CDATA[XIO(S2TON.DN)XIC(S2)OTE(S2);]]>
</Text>
</Rung>
<Rung Number="4" Type="N">
<Text>
<![CDATA[XIC(S1)OTE(Output);]]>
</Text>
</Rung>
</RLLContent>
</Routine>
</Routines>
</Program>
</Programs>
</Controller>
</RSLogix5000Content>
最重要的是，它将梯级（rung）代码保存为纯文本，相当容易阅读和比较。
[XIC(S1)TON(S1TON,?,?)XIC(S1TON.DN),XIC(S2)]OTE(S2);
XIO(S1TON.DN)XIC(S1)OTE(S1);
[XIC(S2)TON(S2TON,?,?)XIC(S2TON.DN),XIC(S1)]OTE(S1);
XIO(S2TON.DN)XIC(S2)OTE(S2);
XIC(S1)OTE(Output);
5、FactoryTalk Design Studio
有趣的是，罗克韦尔最新的产品 FactoryTalk Design Studio 允许以纯文本格式编辑梯形图。这代表了 PLC 编程世界向前迈出的重要一步。然而，基于 Web 的 IDE 实现存在卡顿问题，可能会影响生产力。
routine ld Area.smart_object.program1.main(
output BOOL ^Output
) {
[XIC(S1)TON(S1TON)XIC(s1ton.dn),XIC(S2)]OTE(s2);
XIC(s1ton.dn)XIC(s1)OTE(s1);
[XIC(S2)TON(S2TON)XIC(S2TON.DN),XIC(s1)]OTE(S1);
XIC(S2TON.DN)XIC(S2)OTE(S2);
XIC(s1)OTU(^output);
tag BOOL S1;
tag BOOL S2;
tag TIMER S1TON {
PRE := 1000;
};
tag TIMER S2TON {
PRE := 1000;
};
}
6、文本文件的优势
将梯形图保存为文本具有几个重要优势。与二进制文件相比，文本文件天生更易读、更易编辑，使程序员能够快速理解和修改逻辑。这种可读性还有助于使用 Git 等版本控制系统，实现高效的变更跟踪、协作编辑以及不同代码分支的无缝合并。此外，文本文件简化了调试过程和代码评审，因为问题更容易被发现和解决。通过将梯形图标准化为文本格式，我们使 PLC 编程与软件开发的最佳实践保持一致，促进更有条理、更易维护、更少错误的代码。
7、结束语
每家 PLC 制造商都有自己的程序文件存储方式，通常是二进制格式。虽然有些提供 XML 导出，但这些格式并未标准化，而且仍然难以阅读。这使得版本控制系统的使用变得困难，并拖慢了协作。
LadderScript 提出了一种单一的、基于文本的梯形图格式，易于阅读、比较，并可与 Git 等版本控制工具配合使用。由于是开源的，LadderScript 可以被广泛采用，并且可以创建工具将 LadderScript 转换为不同制造商使用的 XML 格式。图形化的 LadderScript 编辑器也可以让创建和管理梯形图变得更加容易。
原文链接: Why we need LadderScript
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