High−level Instructions
3 − 303
When the time set for the special internal relay R900D has elapsed, the relay is turned on.
R900D can also be used as a timer contact. (The relay is off when the execution condition (trigger) is off, and
while subtraction is being carried out.)
R0
R900D R5
F137 STMR, DT10,DT20
Operation is the same as that in the program example.
Timer set time
The timer setting is entered as a value of 0.01 x (timer set value).
The timer set value is specified as a K constant within the range of K1 to K32767.
STMR is set between 0.01 and 327.67 seconds, in units of 0.01 seconds.
If the set value is K500, the set time will be 0.01 x 500 = 5 seconds.
Precautions during programming
The area in which the set value is stored must be set so that the area specified for the elapsed value does not
overlap any areas reserved for other timer or counter instructions, or memory areas used for high−level
instruction operations.
Because subtraction is carried out when operations are carried out, the program should be set up so that
operations are carried out every scan.
(In cases such as programs where interrupt operation is carried out, or for jump or loop instructions, where
several operations are carried out during one scan, or where it was not possible to carry out any operation
during the scan, correct results cannot be obtained.)
How the Auxiliary Timer Works
1
When the execution condition (trigger) R0 changes from off to on, the set value specified by the S is
sent to the elapsed value area D.
R0
R900D
R5
F137 STMR, DT10, DT20
F0 MV, DT30, DT40
DT20
K500
S
1
Sent to D.
DT10
K500
2
If the execution condition (trigger) R0 stays on, every scan, the value in the elapsed value area D is
subtracted.
R0
R900D
R5
F137 STMR, DT10, DT20
F0 MV, DT30, DT40
2
Subtraction
499
498
497
DT20
K500
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