Standard
RLL Instructions
5–31
Standard RLL Instructions
Timer, Counter, and Shift Register Instructions
T aaa
aaaT
The Timer instruction is a 0.1 second single
input timer that times to a maximum of
999.9 seconds. The Timer Fast instruction
is a 0.01 second single input timer that
times up to a maximum of 99.99 seconds.
These timers will be enabled if the input
logic is true (on) and will be reset to 0 if the
input logic is false (off).
Instruction Specifications
Timer Reference (Taaa): Specifies the
timer number.
Preset Value (Bbbb): Constant value (K)
or a V memory location.
Current Value: Timer current values are
accessed by referencing the associated V
or T memory location*. For example, the
timer current value for T3 physically
resides in V-memory location V3.
Discrete Status Bit: The discrete status
bit is referenced by the associated T
memory location. Operating as a “timer
done bit”, it will be on if the current value is
equal to or greater than the preset value.
For example, the discrete status bit for
Timer 2 is TA2.
TMR
B bbb
Preset Timer #
TMRF
B bbb
Preset Timer #
The timer discrete status bit and the
current value are not specified in the timer
instruction.
NOTE: Timer preset constants (K) may be changed by using a handheld
programmer, even when the CPU is in Run Mode. Therefore, a V-memory preset is
required only if the ladder program must change the preset.
Operand Data Type DL05 Range
A/B aaa bbb
Timers T 0–177 ––
V memory for preset
values
V ––
1200–7377
7400–7577
Pointers (preset only) P ––
1200–7377
7400–7577
Constants
(preset only)
K –– 0–9999
Timer discrete status
bits
T/V 0–177 or V41100–41107
Timer current values V /T* 0–177
NOTE: * With the HPP, both the Timer discrete status bits and current value are
accessed with the same data reference. DirectSOFT uses separate references,
such as “T2” for discrete status bit for Timer T2, and “TA2” for the current value of
Timer T2.
You can perform functions when the timer reaches the specified preset using the
discrete status bit. Or, use comparative contacts to perform functions at different
time intervals, based on one timer. The examples on the following page show these
two methods of programming timers.
Timer (TMR) and
Timer Fast (TMRF)
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