Fail-Safe Blocks
Fail-Safe Systems
A5E00085588-03
8-105
8.10.2 F_TP
Function
The block generates a pulse with the duration PT at the output Q.
The pulse is started by a rising edge at the input IN. The output Q remains set for
the duration PT, irrespective of the subsequent pattern of the input signal.
The output ET indicates how long the output Q has already been set. The
maximum value it can adopt is that of the input PT. It is reset if the input IN
changes to 0, but not before the time PT has elapsed.
If PT < 0, the outputs Q and ET are reset.
Timing Diagram
scasc
Q
IN
PT
ET
PT PT PT
Startup Characteristics
In the first cycle after a cold or warm restart or in the case of a first call, the timer is
reset.
I/Os
Name Data Type Explanation Default
Inputs:
IN F_BOOL Start input 0
PT F_TIME Duration of the pulse T#0 ms
Outputs:
Q F_BOOL Pulse output 0
ET F_TIME Elapsed time T#0 ms
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