Ladder Logic梯形图
Ladder logic is a graphical programming language derived from relay control circuits and used primarily for programmable logic controllers (PLCs), in which logic is drawn as horizontal rungs containing contacts, coils, timers, counters, and function blocks. In manufacturing documentation it appears in control narratives, PLC backup listings, troubleshooting procedures, safety logic descriptions, and automation training material, where translators must understand the rung conditions and outputs before translating associated comments or instructions.
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Where this term appears
Ladder logic appears in translated control-system manuals, electrical schematics, PLC program listings, and troubleshooting guides. Translators usually localize the surrounding comments, signal names, alarm messages, and device labels rather than the graphical code itself. Consistency is critical because a coil name or input address that is altered in text but not in the logic can break the link between the PLC program and its documentation.
Translation checks
A typical error is translating ladder-related terms word by word without understanding PLC logic: for example, rendering “coil” as a physical inductor or “contact” as a mechanical contact in comments. Another mistake is changing device names or addresses in translated documentation while leaving the original names in the ladder program, which breaks traceability during commissioning or fault-finding. The cost is confusion during troubleshooting because the text no longer matches the control logic.
Keep the term aligned across your files
Check equipment names, units, safety instructions and interface labels against the source and approved references. Confirm any market-specific document requirements separately.
Provide approved terms and previous translations with the source files. Agree how variants, ambiguous wording and revisions will be reviewed. Terminology maintenance and any termbase handback are confirmed in the project scope. See the 8-step AI + expert workflow.
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