ABB DSMD113 5736045-N Monitoring output unit

Description

Master Vote 3000 automatic output tests are performed as a part of the Safeguard 400 Series
base software and consists of:
The output tests consist of:
• Channel test
• Isolate test
• Option for monitoring of read-back of the output status.
• Option for feedback of the output loop supervision signal.
The basic test uses the Isolate-Not and Shutdown-Not (NE) / Activate (ND) signals to control
the test, and receives information back on two inputs (Isolate Status and Test Status). These are
common to all seven outputs on one Master Vote 3000 unit. The standard tests cover all
functions of the Master Vote 3000. The normal action for a NE output on detection of a fault is
to isolate the branch by deactivating Isolate-Not, and report this as a safety message and on the
diagnostics displays. ND stays low.

Bypass Management
The functions of Bypass management are:
• Operator station access control
• On-Line Builder (engineering tool) access control
• Override control and reset
Override is generally used as a collective term for inhibit, input block, output block and manual
mode for the relevant signal types.
The use of override functions in safety related equipment introduces a potential hazard to the
installation and to the people it is designed to protect. Any inhibit of a safety critical input or
override on a safety critical output represents a degradation of the safety level and a possibility
for failure on demand.
Nevertheless, such functions are necessary to achieve a reasonable availability of the process.
All field equipment needs maintenance or replacement at regular intervals, and this is included
in the design of the safety system regarding e.g. number/wiring and placement of instruments.
In these cases the safety level may be maintained by other measures while necessary
maintenance operations are carried out.
There are also requirements for use of inhibits during start-up in certain applications.
The Bypass management function enables project/application specific configuration of the
appropriate level of restrictions regarding operation of the Safeguard 400 Series.

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