Omron CJ - INSTRUCTIONS User Manual

245
3. Instructions
CS/CJ/NSJ Series Instructions Reference Manual (W474)
Timer and Counter Instructions
3
CNT/CNTX
Function
• The setting range 0 to 9,999 for CNT and 0 to 65,535 for CNTX(546).
Hint
Precautions
• Counter numbers are shared by the CNT, CNTX(546), CNTR(012), CNTRX(548), CNTW(814), and
CNTWX(818) instructions. If two counters share the same counter number but are not used
simultaneously, a duplication error will be generated when the program is checked but the counters
will operate normally. Counters which share the same counter number will not operate properly if they
are used simultaneously.
• A counter's PV is refreshed when the count input goes from OFF to ON and the Completion Flag is
refreshed each time that CNT/CNTX(546) is executed. The Completion Flag is turned ON if the PV is
0 and it is turned OFF if the PV is not 0.
• The counter PV is decremented by 1 every
time that the count input goes from OFF to
ON. The Completion Flag is turned ON
when the PV reaches 0.
• Once the Completion Flag is turned ON,
reset the counter by turning the reset input
ON or by using the CNR(545)/CNRX(547)
instruction. Otherwise, the counter cannot
be restarted.
• The counter is reset and the count input is
ignored when the reset input is ON. (When
a counter is reset, its PV is reset to the SV
and the Completion Flag is turned OFF.)
• Counter PVs are retained even through a
power interruption. If you want to restart
counting from the SV instead of resuming
the count from the retained PV, add the
First Cycle Flag (A200.11) as a reset input
to the counter.
SV
Count input
Counter PV
Reset input
Completion
Fla
g
First Cycle Flag
(A200.11)

Omron CJ - INSTRUCTIONS Specifications

General

Brand	Omron
Model	CJ - INSTRUCTIONS
Category	Controller
Language	English