Functional path
Internal 24 V supply
External I/O loads
Option modules
Feedback/encoder supply
Heatsink temperature feedback
Control board
Diagnostic signals and checkpoints
PS.24VO.ht cold/hot timingEncoder fault contextOption module status24 V load isolation
Technician notes
- External loads should be isolated systematically before internal supply replacement.
- Feedback and option-module evidence is often more valuable than a generic trip-code list.