F_Tp - Siemens SIMATIC S7 F Manual

Fail-Safe Blocks
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
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
Inputs: IN
PT
Outputs:
Q
ET
Fail-Safe Systems
A5E00085588-03
IN
Q
PT PT
ET
PT
Data Type Explanation
F_BOOL Start input
F_TIME Duration of the pulse
F_BOOL Pulse output
F_TIME Elapsed time
PT
Default
0
T#0 ms
0
T#0 ms
8-105