Mitsubishi MELSEC QCPU Programming Manual page 118

5 SEQUENCE INSTRUCTIONS
REMARKS
(1) The default value for the low speed timer and low speed retentive timer time limit is 100 ms.
The time limit for the low speed timer and low speed retentive timer can be set in the
parameter mode "PLC system settings" area in increments of 10 ms between the limits of
10 ms to 1 second.
(2) The default value for time limits for the high speed timer and the high speed retentive timer
is 10 ms.
The time limits for the high speed timer and the high speed retentive timer can be set in the
parameter mode "PLC system settings" area in increments of 1 ms between the limits of 10
ms and 100 ms.
(3) Refer to the User's Manual (Functions Explanation, Programming Fundamentals) of the
used CPU module or QnACPU Programming Manual (Fundamentals) for information on
timer counting methods.
[Cautions]
(1) When creating a program in which the operation of the timer contacttriggers the operation of
other timer, create the program according to the operation order of the timers - create the
program for the timer that operates later first.
In the following cases, all timers go ON at the same scan if the program is created in the order
the timers operate,
• If the set value is smaller than a scan time.
• If "1" is set.
Example
• For timers T0 to T2, the program is created in the order the timer operates later.
T1
T0
X0
• For timers T0 to T2, the program is created in the order of timer operation.
X0
T0
T1
[Operation Errors]
(1) There are no operation errors associated with the OUT T
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K1
T2 T2 timer starts counting from the next scan after the timer
T1 contact is turned ON.
K1
T1 T1 timer starts counting from the next scan after the timer
T0 contact is turned ON.
K1
T0 T0 timer starts counting if X0 is turned ON.
K1
T0 T0 timer starts counting if X0 is turned ON.
K1
T1
T1 and T2 timer contacts are turned ON if the
K1
contact of T0 is turned ON.
T2
MELSEC-Q/QnA
instruction.
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