Programmable Safety Controller SCR P
72
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To exit the Enable mode,
the enabling device must be in the Off state, and an Enabling Device Block reset must be
performed.
The enabling device time limit
may be adjusted between 1 second (default) and 30 minutes and cannot be disabled. When
the time limit expires, the associated safety outputs turn Off. To start a new Enable mode cycle, with the time limit reset to
its original value, the enabling device must switch from On to Off, and then back to On.
All On- and Off-delay time limits associated with the safety outputs that are controlled by the enabling device function are
followed during the Enable mode.
Latch Reset Block
Default Nodes
Additional Nodes
Notes
IN
LR
RE
The RE (Reset Enable) node can be used to enable or disable the Latch Reset function. If the input
devices connected to the IN node are all in the Run state and RE input signal is high, the LR function
block can be manually reset to have its output turn On. See
on p. 86 with Reference Signal
SO2 connected to the RE node.
Latch Reset
Function Block
M0:ES1
M0:MR1
M0:RO2
M0:RO1
Non Monitored
Reset Signal
The Latch Reset function block LR1 will turn its output and the safety output RO1 Off
when the E-Stop button changes to the Stop state.
The latch off condition can be reset when the Reset Enable RE of LR1 detects that the
RO2 reference signal is in the Run state & MR1 is used to perform a reset.
Figure 50: Timing Diagram
—Latch Reset Block
