Eaton ELC-PB, Programming Manual

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3 . I n s t r u c t i o n S e t
M N050 03003E F or mo re infor ma tio n vi sit:
w w w. e a t o n . c o m
3-277
API Mnemonic Operands Function
97 CNT
S
1
, S
2
Counter 16-bit
Bit Devices Word devices Program Steps
Type
OP
X Y M S K H KnX KnY KnM KnS T C D E F
S
1
*
S
2
* *
CNT: 5 steps
ELC ELCB ELCM
PB PC/PA/PH PV PB PH/PA
32 16 P 32 16 P 32 16 P 32 16 P 32 16 P
Operands:
S
1
: 16 bit counter number (C0~C199)
S
2
: Preset value (K0~K32,767, ELC-PB, ELCB-PB: D0~D599,
ELC-PC/PA/PH: D0~D4,999, ELC-PV, ELCM-PH/PA: D0~D9,999)
Description:
Each time the conditions preceding a CNT instruction transition from false-to-true, the counter will
increment by one. When the accumulative value of a counter equals its Preset value, the counter
done bit will turn on. The done bit of a counter is the counter number (C2 for example) and must be
used in a bit instruction. When the counter number is used in a word instruction, it is the
accumulative value (the count value). If the conditions preceding a CNT instruction transition from
false-to-true after the preset value has been reached, the done bit contact and the accumulative
value will remain unchanged. To reset a counter, use the RST instruction.
Program example:
Ladder Diagram:
X0
C20 CNT K100
Instruction: Operation:
LD X0 ; Load A contact of X0
CNT C20 K100
; C20 counter Setting is K100