38 Discrete I/O Modules
Publication 1746-IN005A-US-P
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 shown on page 39.
2. Clear the processor major fault bit S:1/13.
3. Clear processor status file S:6 major error code (optional).
4. Return 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/-OVP16 -Littelfuse #322010,10A. This fuse is required to
maintain UL/CSA rating. Replacement Fuse Kit is catalog number
1746-F8. (5 fuses per kit).
• 1746-OAP12 -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 (5 fuses per kit).
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