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3 Safety Standard Function Blocks
NX-series Safety Control Unit Instructions Reference Manual (Z931)
3
SF_CTU
SF_CTU
This FB increments the counter value when the counter input signal is received.
• This FB creates an up counter. The preset value and counter value must have a SAFEINT data type.
• When reset signal
RESET
changes to TRUE, counter value
CV
changes to 0 and counter output
Q
changes to FALSE.
• When counter input signal
CU
changes to TRUE,
CV
is incremented. When the value of
CV
reaches
the value of
PV
or higher, the value of
Q
changes to TRUE.
• Even after the value of
CV
exceeds the value of
PV
,
CV
is incremented to up to 32,767 when
CU
changes to TRUE.
•
CU
is ignored while
RESET
is TRUE.
CV
is not incremented.
Instruction
Name
FB/FUN
Graphic expression
SF_CTU
Up-counter
FB
Variables
Input Variables
Variable
Name
Data type
Valid range
Default
Description
CU
Counter input
BOOL
TRUE or FALSE
FALSE
Counter input
RESET
Reset signal
BOOL
TRUE or FALSE
FALSE
TRUE: Reset
CV
to 0.
PV
Preset value
SAFEINT
0 to 32767
0
Counter preset value
Output Variables
Variable
Name
Data type
Valid range
Default
Description
Q
Counter output
SAFEBOOL TRUE or FALSE
FALSE
TRUE:
CV
is greater than or equal
to
PV
.
FALSE:
CV
is less than
PV
.
CV
Counter value
SAFEINT
0 to 32767
0
Counter present value
Function
SF_CTU
CU
RESET
PV
Q
CV
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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