Standard
RLL Instructions
5–33
Standard RLL Instructions
Timer, Counter, and Shift Register Instructions
T aaa
T aaa
The Accumulating Timer is a 0.1 second
two input timer that will time to a maximum
of 9999999.9. The Accumulating Fast
Timer is a 0.01 second two-input timer that
will time to a maximum of 99999.99. Each
one uses two timer registers in V-memory.
These timers have two inputs, an enable
and a reset. The timer starts timing when
the enable is on and stops when the
enable is off (without resetting the count).
The reset will reset the timer when on and
allow the timer to time when 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 resides in
V-memory location V3.
Discrete Status Bit: The discrete status
bit is accessed by referencing 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 would be T2.
TMRA
B bbb
Enable
Reset
Preset Timer #
TMRAF
B bbb
Enable
Reset
Preset Timer #
The timer discrete status bit and the
current value are not specified in the
timer instruction.
NOTE: The accumulating type timer uses two consecutive V-memory locations
for the 8-digit value, and therefore two consecutive timer locations. For example, if
TMR 1 is used, the next available timer number is TMR 3.
Operand Data Type DL05 Range
A/B aaa bbb
Timers T 0–176 ––
V memory for preset
values
V ––
1200–7377
7400–7577
Pointers (preset only) P ––
1200–7377
7400–7577
Constants
(preset only)
K –– 0–99999999
Timer discrete status
bits
T/V 0–176 or V41100–41107
Timer current values V /T* 0–176
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.
The following examples show two methods of programming timers. One performs
functions when the timer reaches the preset value using the discrete status bit, or
use comparative contacts to perform functions at different time intervals.
Accumulating
Timer (TMRA)
Accumulating Fast
Timer (TMRAF)
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