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5.11 Standard Counter Function Blocks
5.11.3 Up/Down counter
CTUD(_E)
5.11.3 Up/Down counter
CTUD(_E)
Function
Operation processing
Counts (+1) when is turned ON, and counts down (−1) when is turned ON.
sets the maximum value of counter.
turns ON when reaches 0.
turns ON when reaches the maximum value .
The value of is set to when is turned ON.
CTUD(_E)
_E: With EN/ENO
indicates any of the following
functions.
CTUD CTUD_E
Input argument, EN:
Executing condition (TRUE: Execution, FALSE: Stop) :Bit
s1:
Count-up signal input :Bit
s2:
Count-down signal input :Bit
s3:
Count-up reset :Bit
s4:
Count-down reset :Bit
n:
Maximum count value :Word (signed)
Output argument, ENO:
Output status (TRUE: Normal, FALSE: Error or stop) :Bit
d1:
Count-up match output :Bit
d2:
Count-down match output :Bit
d3:
Current count value :Word (signed)
Universal
UD
High
Performance
CTUD_E
(EN, s1, s2, s3, s4,
n, d1, d2, d3);
ENO:=
Structured ladder
ST
EN ENO
s2
s4
CTUD_E
d2
s1 d1
s3 d3
n
d3
s1
d3
s2
n
d2
d3
d1
d3
n
n
d3
s4
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