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3 Safety Standard Function Blocks
NX-series Safety Control Unit Instructions Reference Manual (Z931)
3
SF_SR
SF_SR
This FB retains the value of a SAFEBOOL variable.
It gives priority to the
Set
input if both the
Set
input and
Reset
input are TRUE.
• This instruction forms a self-holding output that gives priority to setting. The following table shows the
relationship between the inputs and outputs.
The following figure shows a programming example and timing chart.
Instruction
Name
FB/FUN
Graphic expression
SF_SR
Set-Priority Keep
FB
Variables
Input Variables
Variable
Name
Data type
Valid range
Default
Description
SET1
Set
SAFEBOOL TRUE or FALSE
FALSE
Set input (Given priority.)
RESET
Reset
BOOL
TRUE or FALSE
FALSE
Reset input
Output Variables
Variable
Name
Data type
Valid range
Default
Description
Q1
Keep
SAFEBOOL TRUE or FALSE
FALSE
Keep output
Function
Value of
SET1
Value of
RESET
Value of
Q1
TRUE
TRUE
TRUE
TRUE
FALSE
TRUE
FALSE
TRUE
FALSE
FALSE
FALSE
Not changed.
SF_SR
SET1
RESET
Q1
Set1=A
Reset=B
Q1=abc
TRUE
FALSE
TRUE
FALSE
TRUE
FALSE
Summary of Contents for NX-SL series
Page 8: ...CONTENTS 6 NX series Safety Control Unit Instructions Reference Manual Z931 ...
Page 28: ...Sections in this Manual 26 NX series Safety Control Unit Instructions Reference Manual Z931 ...
Page 98: ...2 Standard Functions 2 64 NX series Safety Control Unit Instructions Reference Manual Z931 ...
Page 104: ...2 Standard Functions 2 70 NX series Safety Control Unit Instructions Reference Manual Z931 ...
Page 110: ...2 Standard Functions 2 76 NX series Safety Control Unit Instructions Reference Manual Z931 ...
Page 265: ...I 1 I NX series Safety Control Unit Instructions Reference Manual Z931 Index ...
Page 268: ...I 4 NX series Safety Control Unit Instructions Reference Manual Z931 Index ...
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