Omron CPM1 Programming Manual

213
Timer and Counter Instructions Section 5-15
Note that “TIM 000” is used to designate the TIMER instruction defined with
TC number 000, to designate the Completion Flag for this timer, and to desig-
nate the PV of this timer. The meaning of the term in context should be clear,
i.e., the first is always an instruction, the second is always a bit operand, and
the third is always a word operand. The same is true of all other TC numbers
prefixed with TIM or CNT.
An SV can be input as a constant or as a word address in a data area. If an IR
area word assigned to an Input Unit is designated as the word address, the
Input Unit can be wired so that the SV can be set externally through thumb-
wheel switches or similar devices. Timers and counters wired in this way can
only be set externally during RUN or MONITOR mode. All SVs, including
those set externally, must be in BCD.
5-15-1 TIMER – TIM
Limitations SV is between 000.0 and 999.9. The decimal point is not entered.
Each TC number can be used as the definer in only one TIMER or COUNTER
instruction. TC numbers run from 000 through 511 in the CQM1 PCs and from
000 through 127 in the CPM1, CPM1A/SRM1 PCs.
TC 000 through TC 015 (TC 000 through TC 003 in the CPM1/CPM1A/SRM1)
should not be used in TIM if they are required for TIMH(15). Refer to 5-15-4
HIGH-SPEED TIMER – TIMH(15) for details.
Description A timer is activated when its execution condition goes ON and is reset (to SV)
when the execution condition goes OFF. Once activated, TIM measures in
units of 0.1 second from the SV.
If the execution condition remains ON long enough for TIM to time down to
zero, the Completion Flag for the TC number used will turn ON and will remain
ON until TIM is reset (i.e., until its execution condition is goes OFF).
The following figure illustrates the relationship between the execution condi-
tion for TIM and the Completion Flag assigned to it.
Precautions Timers in interlocked program sections are reset when the execution condition
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 5-15-2 COUNTER – CNT for
details.
N: TC number
#
Ladder Symbol
Definer Values
SV: Set value (word, BCD)
IR, SR, AR, DM, HR, LR, #
Operand Data Areas
TIM N
SV
Execution condition
Completion Flag
ON
OFF
ON
OFF
SV SV

Omron CPM1 Specifications

General

Brand	Omron
Model	CPM1
Category	Controller
Language	English