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Exception Handling
Exception Handling
Inhibit of Inputs
The gas detector inputs and the fire inputs have the possibility for setting inhibit
(Set/Reset Inhibit) on individual signals from the operator dialog. The function is
used to disable actions from the signals while the alarm and event reporting is
retained. Inhibit is most commonly used in fire and gas systems but is also utilized
in ESD systems for special applications.
In Cause & Effect matrices implemented with Safety Builder it is also possible to
specify an inhibit function for DIS
for emulating the inhibit function. Control and indication of the Tested property is
included in the Faceplate by configuring attributes in the Function Selector aspect,
see figure
corresponding to Boolean and click Apply to save the changes.
A special dialog with inhibit function for these signals is available for use with
display elements (dcDiInhibitDialog and dcAiInhibitDialog). When these objects
are selected by name the standard dialog is used.
1. DIS can not be used for safety critical signals.
24
Figure
5. To use Tested for the inhibit function, select the checkbox
1
/DIC and AIS/AIC. The property Tested is used
Section 2 Operation
3BNP004849-600
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