Mitsubishi A2CCPU User Manual

4. AZCCPU /MELSEC-A
(b) The watch dog timer setting must be greater than the
constant scan time setting.
If the watch dog timer setting is smaller than the constant
scan time setting, a
WDT error might occur.
The relationship between the constant scan time setting
and the watch dog timer setting is indicated below.
0 < Constant scan time setting d WDT setting - 1
(c) The set constant scan time must be greater than the
maximum scan time
of the sequence program.
If the sequence program scan time is longer than the
constant scan time, the constant scan function is not
performed correctly.
Scan in which constant scan is not executed correctly be cor.
mw, constant scan
rectly in the succeeding
scan
I
Fig. 4.12 Scan lime Largo# than Conrtrnt Scan Setting
(2) Setting for constant scan execution
(a) Constant scan execution
A constant scan time setting is written to 09020 using the
sequence program or the peripheral device.
(b) Constant scan not executed
The value
"0" is written to 09020 using the sequence
program or the peripheral device.
R
1
.d
1
U

Mitsubishi A2CCPU Specifications

General

Brand	Mitsubishi
Model	A2CCPU
Category	Controller
Language	English