Applicable Systems
Series 0i
Series 16/18/21
Alpha
Beta
Symptoms
A watchdog timer error was detected in the PMC.
Possible Causes
- PMC RAM or ROM hardware fault
- PMC serial communication failure
- PMC watchdog timer expired
- Ladder program exceeds memory capacity
Troubleshooting Steps
- Step 1: Check the PMC status and diagnostic information
Identify the specific PMC error type - Step 2: If PMC RAM parity error, try clearing PMC parameters and reloading
PMC parameters reloaded successfully - Step 3: If ladder overflow, reduce the ladder program size or add memory
Ladder program fits within available memory - Step 4: If hardware fault, replace the PMC module or main board
New hardware eliminates the alarm
How to Reset
To reset PMC alarm 603: 1) Identify the PMC error type from diagnostics. 2) Reload the PMC ladder program if corrupted. 3) Power cycle the CNC. 4) If hardware fault, replace the faulty module. Caution: Reloading PMC parameters may affect machine-specific functions.
Frequently Asked Questions
- Q: What does 603 mean on Fanuc FANUC 0/0i/30i Series?
A watchdog timer error was detected in the PMC.
- Q: How do I fix 603 on Fanuc?
Follow the troubleshooting steps: Check the PMC status and diagnostic information
Source: FANUC CNC System Alarm Manual (doc.eleok.com)
Category: CNC