LED Indicators

The light-emitting diodes (LEDs) on the front of the FCP280 module provide a visual indication of the

– FCP280 operating status

– Transmit/receive communication activity on the four extended fieldbus channels

(Fieldbus A and B on each channel) LEDs on copper or fibre optic

network adapters provide visual indication of the following

– Internal and external power supply health status

– Communication activity with the control network A and B links and the FCP280

Redundant controllers only:

– No error messages are sent to the field or to applications using the controller data,

because unless the two modules match exactly bit-for-bit in sending a message, the

No information is allowed to flow out of the controller.

– The secondary controller is synchronised with the primary controller,

which helps to ensure that the most up-to-date data is available in the event of a primary controller

failure.

– Since the secondary controller performs exactly the same operations as the primary controller,

potential defects can be detected prior to any switchover.