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2-8 Genius Modular Redundancy Flexible Triple Modular Redundant (TMR) System
User’s Manual – March 1995
GFK-0787B
Manual Input Controls
Safety systems often use controls for manual trip and manual inhibit. The GMR autotest and
fault processing operations are unaffected by such controls.
A manual trip causes the input to assume the alarm condition. For example, for a
normally-energized input, the input is open circuit.
A manual inhibit causes the input to remain in the normal condition. For example,
for a normally-energized input, the input is held high even if the device is in the Off
state.
These manual controls can be implemented either in hardware or in software.
Hardware control usually consists of switch contacts applied to the input circuit, as shown
below for a normally-energized input. Repeat contacts of the control switches are often input
into the system for reporting purposes.
Source
Genius
Block
System Input
Manual Trip
Manual Inhibit
Field
Circuit
point 1
point 16
System Input
Source
Genius
Block
point 1
point 16
Source
Genius
Block
point 1
point 16