Diagnostics and Troubleshooting Fault Detection and Troubleclearing

Controller

Diagnostic Summary

(In the User Utility and Operator

Interface)

Controller

Fault Detection / Troubleclearing

LED on CPU

Menu

Status

Item

 

 

 

Possible Cause

Controller Action

 

 

User Action

COMM A

GOOD

 

 

COMM A

BOARD

 

FAILURE

 

 

COMM A

BOARD NOT

 

FOUND

COMM B

GOOD

 

 

COMM B

BOARD

 

FAILURE

 

 

COMM B BOARD NOT FOUND

PANEL

NORMAL

(OI)

 

 

 

POWER LED flashes 13 times.

POWER LED flashes 13 times

POWER LED flashes 13 times.

POWER LED flashes 13 times

The COMM A port hardware has a serious failure.

The main CPU board has a non- default address and no COMM port installed.

The COMM B port hardware has a serious failure.

The control file configuration requires a master port and no Comm Port is installed.

Executes normally.

Executes normally.

Executes normally. All Modbus read block outputs are frozen at their last read values.

Executes normally. All Modbus read block outputs are frozen at their last read values.

none

Replace Comm board.

Install CPU with optional RS 485 communications (if not installed) or set COMM A station address to 255.

none

Replace CPU.

Install Comm Board or download a configuration that has no Modbus slave blocks

none

86

UMC800 Controller Installation and User Guide

Release F

 

 

4/01

Page 94
Image 94
Honeywell UMC800 manual Panel Normal