Appendix C - Input/Output Board (Iob) Status Indicators - Carrier AquaEdge 19XR Controls Operation And Troubleshooting

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APPENDIX C — INPUT/OUTPUT BOARD (IOB) STATUS INDICATORS

All control boards have LED indicators that show control

board and communication status.

A red LED on each control module operates in the follow-

ing manner:

• Power not present or power supply failure: LED is off

• Power present but microprocessor in Reset: LED is off

• Microprocessor operational but not communicating:

LED flashes 3 seconds on, 3 seconds off

• Microprocessor operational and communicating with

control system: LED flashes at 0.5 Hz rate (1 second on,

1 second off) in sync (±100 ms) with all other new con-

trol modules on the same communication bus

• Microprocessor in boot mode: LED flashes at 0.2 sec-

onds on, 0.2 seconds off

Each independent communication port has a green status

LED. The green LED is on when data is being transmitted by

the board.

All RS485 ports have a green LED.

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