ABB DAI 04 0369632M Nonvolatile memory

Description

Do not remove an operational controller under power unless the

stop/reset switch has been depressed once and the controller has halted (sta

tus LED is red and group A LEDs one through six are on). This procedure must

be followed when removing a controller from a redundant configuration. An

operational controller must halt operation before control passes to the redun

dant controller.

Firmware revision levels must be the same in both primary and redundant

controllers. If the firmware revision levels are different and a failover occurs, the

redundant controllers may operate erratically.

The stop/reset switch is a two-hit switch. It stops the control

ler in an orderly manner, preventing glitches on the bus. The

switch is accessible through the opening on the faceplate

(Fig. 4-1). Since the opening is small, pressing the switch

requires a thin round object. Pressing the switch once stops

operation. Always stop the controller before removing it from

the MMU. Stopping the controller this way causes it to:

Save and lock the controller configuration.

Complete any nonvolatile memory write operations in

progress.

Deactivate all communication links.

Transfer control from the primary controller to the redun

dant controller in redundant configurations.

Change the status LED color to red.

Once the controller is stopped, pressing the switch again

resets the controller. Use the reset mode to:

Reset the default values to the power-up values.

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