GE GFK-0787B Noise Reduction Machine User Manual


 
5
5-10 Genius Modular Redundancy Flexible Triple Modular Redundant (TMR) System
User’s Manual –March 1995
GFK-0787B
Pulse Test Operation
The Output Autotest uses the standard Genius block Pulse Test feature. During this test, the
system is on-line and available.
For the test to be performed:
All blocks in the group must be on-line.
There may be no I/O override applied to any block in the group.
In addition, for each block output that is associated with a given system output within
the group:
there may be no I/O force applied.
there may be no hardware fault (such as a failed switch).
all block outputs associated with the system output must presently be in the
same logical state. (Monitoring of system status references to detect forces and
overrides is discussed later in this chapter).
Outputs that are OFF are pulsed OFF-ON-OFF and checked for correct voltage, for the
presence of diagnostic data, and for correct current (if the No Load diagnostic is enabled). If a
point reports correct voltage and/or current data, the point passes and is not re-pulsed.
However, if a point does not report correct voltage and/or current data, it is retested up to a
maximum of seven times, in successively longer pulses. The ON pulse times begin at
approximately 1.7mS, and can increase up to approximately 20mS. There is a delay of
approximately 5mS to 15mS between successive pulses of the same point.
Outputs that are ON are pulsed ON-OFF-ON. This checks whether a point’s feedback
voltage matches its commanded state. Points are pulsed OFF for approximately 5ms. If the
voltage matches, a point passes. If not, the point is pulsed OFF again, for approximately
7.5mS.
Note that the times given here are typical for 16-circuit blocks (pulse times and quantities are
different for 32-circuit blocks). Actual times in any application depend on the presence of
other scheduled tasks and the configuration of the points.
Note
Use of the Genius output Pulse Test feature from the application
program or Hand-held Monitor is NOT recommended for GMR
applications, since it will produce erroneous results.