Up/Down Counter (Fun07); 7： Udctr - FATEK FBS Series Manual

FUN 7 D
UDCTR
Symbol
Clock CK
Up/Down count
U/D
Clear counter
CLR
WX
Range
WX0
Ope-
∣
rand
WX240
CV
PV
○
Description
When the clear control "CLR" is 1, the counter's CV will be reset to 0 and the counter will not be able to
●
count.
When the clear control "CLR" is 0, counting will then be allowed. The nature of the instruction is a P
●
instruction. Therefore, when the clock "CK↑" is 0→1 (rising edge), the CV will increased by 1 (if U/D=1) or
decreased by 1 (if U/D=0).
When CV=PV, FO0("Count-Up) will change to 1". If there are more clocks input, the counter will continue
●
counting which cause CV≠PV. Then, FO0 will immediately change to 0. This means the "Count-Up" signal
will only be equal to 1 if CV=PV, or else it will be equal to 0 (Care should be taken to this difference from
the "Count-Up" signal of the general counter).
The upper limit of up count value is 32767 (16-bit) or 2147483647 (32-bit). After the upper limit is reached,
●
if another up count clock is received, the counting value will become –32768 or -2147483648 (the lower
limit of down count).
The lower limit of down count value is -32767 (16-bit) or -2147483647 (32-bit). After the lower limit is
●
reached, if another down count clock is received, the counting value will become 32768 or 2147483648
(the upper limit of up count).
If U/D is fixed as 1, the instruction will become a single-phase up count counter. If U/D is fixed as 0, the
●
instruction will become a single-phase down count counter.
Example
The diagram below is an application example of UDCTR instruction being applied to an encoder.
UP/DOWN COUNTER
(16-bit or 32-bit up and down 2-phase Counter)
Ladder symbol
7D.UDCTR
CV :
CUP
PV :
WY WM WS TMR CTR
WY0 WM0 WS0 T0
∣ ∣ ∣ ∣
WY240 WM1896 WS984 T255
○ ○ ○ ○
○ ○ ○ ○
Black
2-phase encoder
Count-UP (FO0)
CV: The number of the Up/Down Counter
PV: Preset value of the counter or it's
HR IR OR
C0 R0 R3840 R3904
∣ ∣ ∣ ∣
C255 R3839 R3903 R3967
○ ○ ○
○ ○ ○ ○
Red (POWER + 24VDC)
Green (B phase)
White (A phase)
SW
C X16
X17
PLC
6 - 21
Basic Function Instruction
Operand
register number
SR ROR DR
R3968 R5000 D0
16/32-bit
∣ ∣ ∣
+/− number
R4167 R8071 D4095
○* ○* ○
○ ○ ○
X18
FUN 7 D
UDCTR
K
○