Troubleshooting steps
Check for shorts verify load current check wiring replace module if needed
Siemens PLC
86A4 – I/O error
Digital output error
Details
Digital output module cannot switch outputs correctly.
Error typeerror
MeaningDigital output error
Typical causesShort circuit on output overload wiring fault module defective
SolutionsCheck for shorts verify load current check wiring replace module if needed
Severitymedium
Catalog references
Vendor Information
Siemens86A4
Utilities
Troubleshooting Steps
Other codes
Other Siemens PLC Codes
FAQ
Common questions
How do I protect outputs?
Use fuses or circuit breakers rated for the output current to protect against overloads.