PLC
Separate drive communication, readiness and enabled state
A drive can be online while it is not ready to produce torque because of mode, fault or enable prerequisites.
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PLC
A drive can be online while it is not ready to produce torque because of mode, fault or enable prerequisites.
Read article : Separate drive communication, readiness and enabled statePLC
A drive can accept a reference from its panel or another source instead of the PLC because its control-source selection differs.
Read article : Investigate a drive that ignores PLC commands in local modePLC
An actuator can run at an unexpected value because the communication word and drive units use different scaling or limits.
Read article : Compare a drive's received reference with the PLC engineering setpointPLC
A drive can trip repeatedly because its underlying electrical, mechanical or command condition remains present.
Read article : Find the cause of a recurring drive fault before resetting itPLC
A drive's STO state relates to its specified safety function, not every electrical or mechanical hazard around the machine.
Read article : Keep safe-torque-off status separate from electrical isolation and machine readinessPLC
Position faults can involve an encoder, cable, configuration, mechanical coupling or communication issue. A numeric position alone cannot identify the source.
Read article : Investigate axis feedback errors before changing position scalingPLC
A position command can be internally consistent yet physically wrong when feed constants, gearing or units are misconfigured.
Read article : Check axis units and mechanical ratio before correcting travel errorsPLC
Homing can fail because of mode, sensor sequence, feedback validity, configured method or a mechanical prerequisite.
Read article : Investigate an axis that cannot complete its homing procedurePLC
A target can appear wrong because the program requests an absolute position while the application expects an increment, or the reverse.
Read article : Distinguish absolute and relative motion requests during PLC diagnosisPLC
A limit condition can reflect actual position, wrong reference, incorrect scaling or a faulty input. The protective response is evidence to preserve.
Read article : Investigate an axis limit trip without extending its allowed travelPLC
An axis can lag its commanded trajectory because of load, tuning, feedback, drive limits or mechanical constraints.
Read article : Diagnose an axis following error through command and feedback evidencePLC
A requested speed can differ from the accepted value because one of several configured limits or operating modes constrains it.
Read article : Find a drive or PLC limit that clamps the requested speedOur original short guides to AI, account protection, and recovery.