No COMM From Micro to Display
system
Description
No COMM From Micro to Display means the MSM cannot communicate with the display module over CAN bus; alarm only and unit continues to run.
Activation Conditions
If alarm 21100 No COMM From Any Board to Main Micro is not active and Microprocessor Stepper Module cannot communicate with the display module over the CAN bus.
Unit Behavior
Alarm only, unit will continue to run. Module may display “LOSS OF COMMUNICA- TIONS”.
Reset Conditions
Auto reset when CAN communication is restored, or alarm may be manually reset by turning the unit off, then back on again.
Corrective Actions
Check CAN bus a. Inspect connector pins and terminals on PM, 1MSM, 2MSM, DM, ENCU and ES CAP. Verify that there is no damage or corrosion in connections. b. Check display LOSS OF COMMUNICATIONS message is displayed. c. Check for CAN circuit continuity: CAN Hi; Check entire circuit, ES-D to PM-23. If circuit is open, check individual paths as follows: PM-23; 1-1MSM-12 and 2; 1-2MSM-29 and 27 through SP-02 to ENCU-23 and ES- D CAN Lo; Check entire circuit, ES-C to PM-12. If circuit is open, check individual paths as follows: PM-12; 1-1MSM-3 and 6; 1-2MSM-30 and 28 through SP-03 to ENCU-24 and ES-C. CAN Lo; Check entire circuit, ES-C to DM-6. If circuit is open, check individual paths as follows: PM-12; 1-1MSM-3, 6 and 8; DM-6; 1-2MSM-30 and 28 through SP-03 to ENCU-24 and ES-C. d. Check for good continuity. If not, check connectors and wiring between terminals. Verify that there is no damage, moisture or corrosion.