High−level Instructions
3 − 304
3
If the value in the elapsed value area D reaches 0, relay being used is turned on by the OT instruction
which comes next in the program. The special internal relay R900D also goes on at this point.
R0
R900D
R5
F137 STMR, DT10, DT20
F0 MV, DT30, DT40
3
Subtraction completed
DT20
0
Precautions When Using R900D
If R900D is used and multiple auxiliary timers are being used, always use R900D in the line following the
auxiliary timer instruction.
R0
R900D Y10
F137 STMR, DT10, DT20
R1
R900D Y11
F137 STMR, DT30, DT40
Pair
Pair
(a)
(b)
When timer (a), which is activated by R0 turns on, expires, Y10 goes on. When timer (b), which is activated by
R1 turns on, expires, Y11 goes on.
Describe the program as shown below will result in incorrect operation.
X1
X0
R900D Y10
R900D Y11
F137 STMR, DT10, DT20
F137 STMR, DT30, DT40
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