Mitsubishi Electric MELSEC-Q Series User Manual page 180

10 DEVICES
10 - 22
Timer Processing & accuracy
(a) When an OUT T
timer coil ON/OFF, present value update & contact ON/OFF processing.
Timer present value update and contact ON/OFF processing do not occur
at END processing.
[Ladder example]
X0
[Processing at OUT T0 instruction]
END
Sequence
program
(b) When the OUT T
the scan time measured at the END instruction.
If the timer coil is OFF when the OUT T
present value is not updated.
[Ladder example]
X0
[Present value update timing]
OUT T0
Program
ON
OFF
X0 external input
OFF
QCPU's X0
OFF
T0 coil
OFF
T0 contact
1
10 ms
measurement
Measured value
at END instruction
T0 present value
Input reading timing
(+1 scan)
instruction is executed, the following processing occurs:
K10
T0
OUT T0
Processing content
instruction is executed, the present value is added to
H K8
T0
OUT T0 OUT T0
END END END
processing processing processing
ON
ON
2 3
2 1 1 2
2 3
0+2=2 2+3=5
MELSEC-Q
END
Coil ON/OFF
Present value update
Contact ON/OFF
instruction is executed, the
OUT T0 OUT T0
END END
processing processing
ON
1 2 3 1 2 1
2 3 2
5+2=7 7+3=10
Timer accuracy
- (1 scan time + timer time
limit setting) to 1 scan time
OUT T0
END
processing
2 3
3
10 - 22