Fail-Safe Blocks
Fail-Safe Systems
8-112 A5E00085588-03
Error Handling
None
8.11.2 F_R_TRIG
Function
The block checks the input variable for the occurrence of a rising edge and
indicates at the output whether an edge has been detected. At a rising edge of the
input pulse CLK, the output Q is set to 1 until the next call of the block.
Timing Diagram
CLK
Q
Startup Characteristics
If the input CLK has a value of 1 in the first cycle after a cold or warm restart, a
rising edge is detected and the output Q is set to 1 until the next call of the block.
I/Os
Name Data Type Explanation Default
Input:
CLK F_BOOL Input pulse 0
Output:
Q F_BOOL Output pulse 0
Error Handling
None
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