![background image](http://html1.mh-extra.com/html/omron/nx-sl-series/nx-sl-series_instruction-and-reference-manual_742411119.webp)
3 - 9
3 Safety Standard Function Blocks
NX-series Safety Control Unit Instructions Reference Manual (Z931)
3
SF_CTUD
The following figure shows a programming example and timing chart for a
PV
of INT#3.
Use the SF_CTD instruction or SF_CTU instruction to create a counter that only decrements or only
increments.
Additional Information
CU=A
CD=B
Reset=abc
Load=def
CV=mno
PV=INT#3
QU=ghi
QD=jkl
When
CV
reaches
PV
,
QU
changes to TRUE.
When
RESET
changes to TRUE,
CV
changes to 0.
QU
changes to FALSE and
QD
changes to TRUE.
When
Reset
changes to FALSE, the counter inputs are enabled.
When
CU
changes to TRUE,
CV
is incremented.
This causes
QD
to change to FALSE.
When
CD
changes to TRUE,
CV
is decremented.
When
CV
reaches 0,
QD
changes to TRUE.
When
Load
changes to TRUE,
CV
changes to
PV
.
This causes
QU
to change to TRUE and
QD
to change to FALSE.
TRUE
FALSE
TRUE
FALSE
TRUE
FALSE
TRUE
FALSE
TRUE
FALSE
TRUE
FALSE
0
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 ...
Page 269: ......