Response Electronics CL6011B Specifiche Scaricare il pdf (Pagina 75)

3Ć55 Theory of Operation: Redundancy

Original Ć June 1990 CE4.2:CL6211

3.6.3 Redundant Controller Normal Online Operation

The redundant controllers normal online operation requires the ACTIVE

controller to continuously update the STANDBY controller, to keep the

STANDBY controller matched to the current operating point of the

ACTIVE controller. Effectively, the STANDBY controller is forced to track

the operation of the ACTIVE controller.

3.6.3.1 Inter-Controller Tracking

Under normal operation, redundant controllers are continuously passing

data back and forth between the ACTIVE and STANDBY controllers.

Both status and tracking information is passed between the controllers.

A special inter-controller tracking message is passed as often as

possible, to continuously keep the STANDBY controller updated to the

current operating point of the ACTIVE controller. This is NOT a

lock-step redundancy, that is, the controller central processing units are

not forced to examine and validate each operation that the other

controller performs. The inter-controller tracking message will force the

STANDBY controller to match the ACTIVE controller at a specific instant

in time. The STANDBY controller will then continue performing its normal

forward control algorithms - as if it were in control of the outputs (but it

actually is not in control of the outputs).

3.6.3.2 Tuning Parameter Handshake

Any tuning parameter change received at the active controller is

immediately saved into Non-Volatile Memory (NVM). This allows the

controller to retain this data on a power fail restart condition. The same

tuning parameter change request is also queued for transmission to the

STANDBY controller. This will guarantee that the STANDBY controller is

operating with the same tuning parameter constants as the ACTIVE

controller.

3.6.4 Redundant Controller Power Fail Restart

The redundant controllers will restart according to the following

sequence after any power failure occurs.

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Response Electronics CL6011B Specifiche Pagina 75