Mitsubishi MELSEC-A series, Programming Manual

Page: 340 / 508

7. APPLICATION INSTRUCTIONS
7
−
138
MELSEC-A
Operation Error In the following case, operation error occurs and the error flag turns on.
•
The setting of D is other than M9020 to 9024.
Program Example DUTY
When X8 is turned ON, M9021 turns on for 1 scan and off for 3 scans.
POINT
Even if the timing pulse input turns off, the timing pulse by the DUTY
instruction does not turn off. Therefore, to stop the timing pulse, execute the
circuit as shown below.
0
X008 K K
DUTY 1 3 M9021
•
Coding
0 LD X008
1 DUTY K1 K3 M9021
8 END
OFF
ON
X8
OFF
ON
M9021
1 scans 3 scans
0
Timing pulse
stop input K
K
DUTY 0 1 M9020
Special relay number M9020 to 4
which stops timing pulse.
Scan during which timing pulse is
off.
Scan during which timing pulse is
on. Be sure to set to 0.