PLC / Drives, Motion & Axis Diagnostics
Investigate reversed reported axis direction without trial movement
Direction can differ because of coordinate conventions, encoder polarity, drive configuration or mechanical transmission assumptions.
Environment and inputs: Industrial PLC / automation guidance · Verify the exact controller, module, firmware, engineering tool and machine documentation. Linked vendor examples apply to their stated products and library versions; observation, state changes and physical work require distinct authorization.
Observe and record
Compare approved drawings, axis definitions, feedback orientation and recorded known-good movement data without commanding the machine.
Interpret the evidence
A sign change in one layer can affect homing, limits and coupled axes as well as the displayed position.
Resolve and verify
Have the motion owner reconcile the documented coordinate model and qualify any correction through a controlled commissioning plan covering all dependent functions.
Machine and data safeguards
Do not reverse motor leads, flip feedback settings or command movement experimentally to determine the direction.