5-11-1 Timer - Tim - Omron SYSMAC C20P Operation Manual

Timer and Counter Instructions
5–11–1 Timer – TIM
Limitations
Description
used to define that timer or counter to access the memory location that holds
the PV.
Note that "TIM 00" is used to designate the Timer instruction defined with TC
number 00, to designate the Completion Flag for this timer, and to designate
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. In explanations of ladder diagrams, the Completion
Flag and PV accessed through a TC number are generally called the Com-
pletion Flag or the PV of the instruction (e.g., the Completion Flag of TIM 00
is the Completion Flag of TC number 00, which has been defined using TIM).
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
thumbwheel switches or similar devices. Timers and counter wired in this
way can be set externally only during RUN or MONITOR mode. All SVs, in-
cluding those set externally, must be in BCD.
Ladder Symbol
TIM N
SV may be between 000.0 and 999.9 seconds. The decimal point of SV is
not input.
Each TC number can be used as the definer in only one timer or counter in-
struction.
TC 00 through TC 47 should not be used in TIM if they are required for
TIMH(15). Refer to 5–11–2 High–Speed Timer – TIMH(15) for details.
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. TIM accuracy is +0.0/–0.1 second.
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 re-
main ON until TIM is reset (i.e., until its execution condition goes OFF).
The following figure illustrates the relationship between the execution condi-
tion for TIM and the Completion Flag assigned to it.
Definer Values
# (00 through 47)
SV
Operand Data Areas
SV: Set value (word, BCD)
Section 5–11
N: TC number
IR, HR, #
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