Programmable Safety Controller SCR P
74
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Reference Signals
A Reference Signal is used to:
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Control an output based on the state of another output
▪
Represent the state of an output, input, safety function or logic block on another page.
M0:ES1
M0:MR1
M0:RO2
LR1 & RO1
When output RO2 is On, the RO2 reference signal state is On or High. The function
block above shows reference signal SO2 connected to the Reset Enable node RE of
Latch Reset Block LR1.
LR1 can only be reset (turned On) when ES1 is in the Run state and RO2 is On.
See
on p. 108 for use of referenced Safety Outputs.
Figure 52: Timing Diagram
—Latch Reset Block and Referenced Safety Output