Allen Bradley SLC 500 Errors
Whenever major error is encountered bit S:1/13 – Major Error Halted Bit is set.
S:54 – Last Major Error Fault Code mirrors the last error code value stored in S:6 register.
Major errors in S:6 or S:54 registers contain four (4) digits in hexadecimal code, however RSLogix 500 software do not display leading „0”.
E.g. error code 0001h is displayed as 1h.
Major Faults can be classified as:
Non-user – a fault caused by various conditions that cease ladder program execution. The user-fault routine is not run when this fault occurs.
Non-recoverable – a fault caused by the user that cannot be recovered from. The user-fault routine is run when this fault occurs. However, the fault cannot be cleared.
Recoverable – a fault caused by the user that can be recovered from in the user-fault routine by resetting Major Error Halted Bit(S:1/13). The user-fault routine is run when this fault occurs.
Major Error categories are:
- powerup errors
- going-to-run errors
- runtime errors
- user program instruction errors
- I/O errors
- 00 mean slot 0
- 1E mean slot 30
- 1F mean slot cannot be determined.
- 03 is special – for modular SLC controller it mean slot 3 but for compact SLC controller it mean slot cannot be determined.
E.g. Error code 250h (0250h) – A chassis data error is detected for module in slot 2