SLC 500 Digital I/O Modules 13
Publication 1746-IN027D-EN-P - December 2012
The following table defines operation of all SLC 500 processors in the case of a blown fuse in
1746-OBP16, 1746-OVP16, and 1746-OAP12 modules.
Recovery From Blown Fuse/Processor Fault/Processor Shutdown
Processor operation will stop under the following conditions:
• The output module fuse blows due to a short circuit.
• JP1 is set to the Processor Faults position (pins 2 and 3 connected).
If the above conditions occur, the following procedures should be used for recovery.
1. Follow fuse replacement procedures described on page 14.
2. Clear the processor major fault bit S:1/13.
3. Clear processor status file S:6 major error code (optional).
4. Return the processor to Run mode.
For additional information on processor fault codes and clearing processor fault bits, refer to the
following user manuals:
• Your programming device’s reference manual
• HHT User Manual, publication 1747-NP002
• Chapter 28, Troubleshooting Fault
• Chapter 29, Understanding the Fault Routine
Replacement Fuse Recommendations
Use the following replacement fuses:
• 1746-OBP16 and 1746-OVP16 modules – Littelfuse #322010,10A or #332010,10A.
This fuse is required to maintain UL/CSA rating. Replacement Fuse Kit is catalog
number
1746-F8 (five fuses per kit).
• 1746-OAP12 module - Use SAN-O HQ 6.3A for replacement. This fuse is required to
maintain UL/CSA rating. Replacement Fuse Kit is catalog number
1746-F9 (five fuses per kit).
Processor Operation After a Blown Fuse (1746-OBP16, 1746-OVP16, and
1746-OAP12 modules)
JP1 Set to Processor Continues JP1 Set to Processor Faults
No error. Processor continues with 1746-OBP16
and 1746-OVP16 outputs de-energized.
1746-OAP12 outputs, on the same common as the
blown fuse, are de-energized.
Nonrecoverable error. Processor operations stop and all
outputs reset to OFF.
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