122
With a C2000H Duplex System, TC 048 through TC 511 cannot be used for
TIMH(15).
TIMH(15) operates in the same way as TIM except that TIMH measures in
units of 0.01 second.
The cycle time affects TIMH(15) accuracy if TC 048 through TC 511 are
used. If the cycle time is greater than 10 ms, use TC 000 through TC 047.
Refer to
5-11-1 TIMER – TIM
for operational details and examples. Except
for the above, and all aspects of operation are the same.
Timers in interlocked program sections are reset when the execution condi-
tion for IL(02) is OFF. Power interruptions also reset timers. If a timer that is
not reset under these conditions is desired, SR area clock pulse bits can be
counted to produce timers using CNT. Refer to
5-11-3 COUNTER – CNT
for
details.
Program execution will continue even if a non-BCD SV is used, but timing will
not be accurate.
Flags
ER:
SV is not in BCD.
Indirectly addressed DM word is non-existent. (Content of
*
DM word
is not BCD, or the DM area boundary has been exceeded.)
5-12-3
COUNTER – CNT
N
: TC number
# (000 through 511)
Ladder Symbol
Definer Values
SV
: Set value (word, BCD)
IR, AR, DM, HR, LR, #
Operand Data Areas
CP
R
CNT N
SV
Each TC number can be used as the definer in only one timer or counter in-
struction.
CNT is used to count down from SV when the execution condition on the
count pulse, CP, goes from OFF to ON, i.e., the present value (PV) will be
decremented by one whenever CNT is executed with an ON execution condi-
tion for CP and the execution condition was OFF for the last execution. If the
execution condition has not changed or has changed from ON to OFF, the
PV of CNT will not be changed. The Completion Flag for a counter is turned
ON when the PV reaches zero and will remain ON until the counter is reset.
CNT is reset with a reset input, R. When R goes from OFF to ON, the PV is
reset to SV. The PV will not be decremented while R is ON. Counting down
from SV will begin again when R goes OFF. The PV for CNT will not be reset
in interlocked program sections or by power interruptions.
Description
Precautions
Limitations
Description
Timer and Counter Instructions
Section 5-12
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