Delta AH500 Hardware Operation Manual page 628

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I/O Connection Timeout

Unconnected Request Timeout

Network Bandwidth NOT Available for Data

Invalid Segment in Connection Path

The model number for the control mode CPU and the

standby mode CPU are not the same.

The firmware version for the control mode CPU and the

standby mode CPU are not the same.

Ethernet for the control mode CPU and the standby

mode CPU are not in the same physical network.

The I/O configurations of the control mode CPU is not

the same as the actual I/O configurations of the

standby mode CPU. (while checking the validation)

The I/O configurations of the control mode CPU is not

the same as the actual I/O configurations of the

standby mode CPU. (after the validation is checked)

System error

Synchronization error

Validation failed

I/O bus fault

Heart beat error

Heart beat communication timeout

Synchronization failed

The standby mode CPU is being switched.

There is no program on the PLC.

PLC program is damage.

Scan time out

CPU access denied

System busy (RST)

System busy (CLR)

C h a p t e r 1 2 Tr o u b l e s h o o t i n g

LED indicator status

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