6 Standard Function Blocks
6.5 CTUD(_E)
214
FXCPU Structured Programming Manual
(Application Functions)
6.5
CTUD(_E)
Outline
This function block counts up/down the number of times of rising of a signal.
1. Format
*1.
Refer to caution points.
2. Set data
In explanation of functions, I/O variables inside ( ) are described.
Explanation of function and operation
This function block counts up (adds "1" to) the value stored in a device specified in
when a device
specified in
turns ON.
This function block counts down (subtracts "1" from) the value stored in a device specified in
when a
device specified in
turns ON.
specifies the maximum value of the counter.
When the value stored in a device specified in
reaches the maximum value
of the counter, a device
specified in
turns ON.
When the value stored in a device specified in
becomes "0", a device specified in
turns ON.
FX
3U(C)
FX
3G
FX
2N(C)
FX
1N(C)
FX
1S
FX
U
/FX
2C
FX
0N
FX
0(S)
Function name
Expression in each language
Structured ladder
ST
CTUD
CTUD(CU,CD,RESET,LOAD,PV);
*1
Example:
Instance name(CU:=M0,
CD:=M10,RESET:=M20,LOAD:=
M30,PV:=D0);
M40:=Instance name.QU;
M50:=Instance name.QD;
D10:=Instance name.CV;
CTUD_E
CTUD_E(EN,CU,CD,RESET,LOA
D,PV); *1
Example:
Instance name(EN=X000,
CU:=M0,CD:=M10,RESET:=M20,
LOAD:=M30,PV:=D0);
M40:=Instance name.QU;
M50:=Instance name.QD;
D10:=Instance name.CV;
Variable
Description
Data type
Input
variable
EN
Execution condition
Bit
CU
(
)
Count up signal
Bit
CD
(
)
Count down signal
Bit
RESET (
)
Reset input signal
Bit
LOAD (
)
Resetting signal
Bit
PV
(
)
Counter set value
Word [signed]
Output
variable
ENO
Execution status
Bit
QU
(
)
Count-up output signal
Bit
QD
(
)
Output signal (which turns ON when the current counter value
becomes "0" or less)
Bit
CV
(
)
Count value data
Word [signed]
CTUD
QU
M40
CU
M0
QD
M50
CD
M10
RESET
M20
CV
D10
LOAD
M30
PV
D0
Instance name
CTUD_E
EN
ENO
QU
M40
X000
CU
M0
QD
M50
CD
M10
RESET
M20
CV
D10
LOAD
M30
PV
D0
Instance name
s1
s2
s3
s4
n
d1
d2
d3
d3
s1
d3
s2
n
d3
n
d1
d3
d2
