9
-
29
(b) Accuracy
The value obtained by the END instruction is added to the current value when the OUT T or OUT ST
instruction is executed.
The current value is not updated while the timer coil is off even if the OUT T or OUT ST instruction is
executed.
Accuracy of the timer response that is from reading input (X) to output the data is up to "2-scan time + timer
limit setting".
Figure 9.25 Timer accuracy (in the case of 10ms)
X0
T0
K8
Timer limit setting=10ms, Setting value of T0=8 (10ms 8=80ms), Scan time=25ms
2
1
1
1
2
1
1
2
2
1
2
ON
OFF
OFF
OFF
ON
ON
OFF
ON
3
2
3
3
2
3
2
3
2
3
25ms
25ms
25ms
25ms
25ms
25ms
0+2=2
2+3=5
5+2=7
7+3=
Count at
execution of the
END instruction
10ms counting
Program
Current value
of T0
External input
to X0
X0 of CPU
module
Coil of T0
Contact of T0
Scan time
END
processing
END
processing
END
processing
END
processing
END
processing
END
processing
Accuracy from when the coil of the timer turns on until
when the contact of the timer turns on
- (1 scan time + timer limit setting) to (1 scan time)
Timing when the coil of the timer turns on
Input reading timing
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