ABB DSMB 144 57360001-EL Network element output module

Description

The Isolate-Not is a composite signal that represents a number of control unit states in the
control unit that should result in branch isolation. Isolate is negated (goes low) as a result of
system malfunction (see previous chapters on system diagnostics), a manual request for
maintenance purpose, or when a test reveals a fault that must be handled by disabling the failing
branch. This is particularly applicable to NE outputs.

The Isolate signal is timed so the loss of a control unit or an output board will always cause a
low Isolate signal to be recognized first. The shutdown output is timed to go low after isolate to
prevent it from requesting a shutdown when the isolate is still high.
In a similar fashion, the isolate is designed to return high after a valid signal is presented on the
shutdown output to prevent spurious action on system restart or isolate removal. This function
allows fault tolerant action to be taken on failure or during maintenance.
Shutdown-Not or Activate
The Shutdown-Not (Normally Energized) or Activate (Normally De-Energized) signal is a
combination of an application generated action, manual action and signals from the test
program. It is also affected by system errors, and is forced low (NE) or will stay low (ND) on a
control unit malfunction.

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