FP2−CCU

Troubleshooting

5.1 Operation if an Error Occurs

5.1Operation if an Error Occurs

5.1.1If the ALARM LED on the Computer Communication Unit Lights

What the ALARM LED does

The ALARM LED on the Computer Communication Unit lights if the watchdog timer in the unit is activated, to warn of a problem.

CCU

ALARM LED

CCU

SD RD ERRSD RD ERR ALARM

COM.1COM.2

CPU unit operation when the ALARM LED lights

The ERROR LED on the CPU unit lights, and operation stops.

The error code to be checked using programming tools or other means is 41 (intelligent unit error).

If it is necessary to continue operation, change the setting of the CPU unit system register 22.

5 − 3