Application Guide Chapter 5
GFK-2928C Oct 2019
PLC Hardware Configuration 26
Figure 32: Automatic Role Switch (AUT_SW) Function Block
ENAB This Boolean reference determines if automatic switching is active
in the Backup PLC.
NUM This should not be changed. (It is the reference to the Bus Number
[0.15]).
SP The timer preset that is applied to the bit comparisons. (The value in
milliseconds should always be less than the value of the Hold-Last-
State timer. A typical setpoint is 1000 msec.)
DSB_A This should not be changed. (It is the reference to the Bus A Status
Bits).
DSB_B This should not be changed. (It is the reference to the Bus B Status
Bits).
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