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The watchdog timer is set by the controller (OSP timer) and is used for ModuleBus. The watchdog timer is re-triggered every time the correct node address is decoded (or broadcast). If the watchdog timer expires or if the SetOSPState command is received, the module enters the OSP state and the active outputs (if any) are set to their OSP values. The OSP value can be either configured as a predefined value or set to use the last good value sent.
The output values are kept as long as the module stays in the OSP state. To change the outputs, the module first has to leave this state. When re-entering Operational State, the outputs are still kept with their OSP value until new valid values are written.
ABB DSQC-321
DSQC-321 | ABB | Memory Module 4MB
All output I/O modules implement the Output Set to Predetermined (OSP) function.
The outputs of the I/O module are set to a predetermined value, if the OSPwatchdog timer expires or if the SetOSPState command is received.
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