7-348
7.17 Other Instructions
7.17.1 Resetting watchdog timer
WDT
(5) Scan time values stored in the special register will not be cleared even if the WDT(P)
instruction is executed.
Accordingly, there are times when the value for the scan time for the special register is
greater than the value of the watchdog timer set in the parameters.
O
peration Error
No operation error occurs in the execution of the WDT(P) instruction.
Program Example
The program in which the watchdog timer is set to 200ms, and the scan time from step 0 to the
END (FEND instruction) is 300ms due to the executing conditions.
Program
w
here
scan
t
i
me
i
s
300
ms
.
Program
w
here
scan
t
i
me
i
s
150
ms
.
[W
hen
W
D
T i
nstruct
i
on
i
s
use
d]
Program
w
here
scan
t
i
me
i
s
150
ms
.
W
D
T
EN ENO
Summary of Contents for MELSEC Q Series
Page 1: ...Structured Programming Manual Mitsubishi Programmable Controller QCPU Common Instructions ...
Page 2: ......
Page 14: ...A 12 MEMO ...
Page 340: ...6 178 MEMO MTR ...
Page 708: ...7 368 MEMO ...
Page 776: ...8 68 MEMO ...
Page 796: ...9 20 MEMO ...
Page 804: ...App 8 MEMO ...
Page 812: ...Index 8 MEMO ...
Page 815: ......