Response Electronics CL6011B Especificações descarregar pdf (Página 76)

3Ć56 Theory of Operation: Redundancy

Original Ć June 1990CE4.2:CL6211

3.6.4.1 Active and Standby Controller Determination

Upon restart after a power failure, the redundant controllers determine

their active/standby status from the position of the output relays.

Whichever controller currently is connected to the output terminations

becomes the active controller.

3.6.4.2 Operating Parameter Restart Values

Both the active and standby controller will execute a restart initialization

of the operating parameter values as defined by the user configuration.

Once both controllers have completed their restart operation, the active

controller initiates the inter-controller tracking communications, which

forces the standby controller to track the current operating point of the

active controller.

3.6.4.3 Configuration Validation

The active controller will perform the following steps after a power fail

restart condition:

1. Self test runs to completion.

2. The user's configuration is recalled from Non-Volatile Memory (NVM).

3. Operating Parameter restart values are applied to each Direct Control Point

(DCP) and Indirect Control Point (ICP).

4. The Function Sequence Table (FST) is allowed to run for the first time.

5. Controller status information is exchanged with the standby controller.

6. If both the active and standby controller have loaded a configuration the

standby controller configuration is validated to match the active controller

configuration.

7. If the configurations do not match, the active controller initiates a download

to the standby controller, forcing the standby controller to match the active

controller.

8. Once the configuration is validated, the inter-controller tracking operation

is performed, and normal online operation of the redundant controllers

continues.

3.6.5 Failure Detection

The controller redundancy scheme is implemented to perform as a

redundant unit along with the Redundant Data Concentrator Unit

(RDCU). Therefore, failure detection, and switchover decisions, are all

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Response Electronics CL6011B Especificações Página 76