Mitsubishi Electric MELSEC-Q00U(J)CPU

364
Make the value of the timer limit setting smaller by changing from low speed timer to high speed timer.
(Assume that the scan time is 20ms.)
The following show the examples of the coil and the contact being simultaneously turned on if the values are
set to become "Timer setting value < Scan time + Timer Limit Setting":
Ex.
When the timer setting value is 1 (1 × 100ms), the scan time is 20ms, and the timer limit setting is 100ms
If the coil of the timer (T0) is turned on at the next scan after the values satisfy "Count at execution of the
END instruction  Timer setting value", the coil and the contact are simultaneously turned on because the
values satisfy "Timer current value = Timer setting value" at the start of the timer.
Ex.
K1
Before change (low-speed timer)
After change (high-speed timer)
Timer setting value
(100ms 1=100ms)
Scan time
(20ms)
Timer Limit Setting
(100ms)
Timer setting value
(10.00ms 10=100ms)
Scan time
(20ms)
Timer Limit Setting
(10ms)
20ms 20ms 20ms
END
00 01
00 1 0
OFF
ON
ON
ON
OFF
OFF
X0
Coil of T0
Contact
of T0
END END END
X0
K1
T0
Count at
execution
of the END
instruction
100ms
counting
1
Current
value of T0
Program
Timer setting value
Scan time
(20ms)
Timer Limit Setting
(100ms)
If the coil is turned on for
this period, the contact
is simultaneously turned
on because the count at
execution of the END
instruction becomes
equal to or larger than
the timer setting value.
Timer setting value
(1 100ms)