Omron NX-SL series User Manual

3 Safety Standard Function Blocks
3 - 10
NX-series Safety Control Unit Instructions Reference Manual (Z931)
SF_F_TRIG
This FB outputs TRUE for one task period only when the input signal changes to FALSE.
• F_TRIG assigns TRUE to output signal Q for one task period only when input signal CLK changes to
FALSE. Otherwise, the value of Q is FALSE.
• If the value of CLK is FALSE when the power supply is turned ON, the value of Q changes to TRUE.
The following figure shows a programming example and timing chart.
The SF_F_TRIG instruction assigns TRUE to output signal Q for only one task period when the power
supply is turned ON (RUN).
Instruction Name FB/FUN Graphic expression
SF_F_TRIG Down Trigger FB
Variables
Input Variables
Variable Name Data type Valid range Default Description
CLK Input signal SAFEBOOL TRUE or FALSE FALSE Input signal
Output Variables
Variable Name Data type Valid range Default Description
Q Output signal SAFEBOOL TRUE or FALSE FALSE Output signal
Function
Additional Information
SF_F_TRIG
CLK Q
CLK=A
Q=abc
Task period
TRUE
FALSE
TRUE
FALSE

Omron NX-SL series Specifications

General

Brand	Omron
Model	NX-SL series
Category	Control Unit
Language	English