Example Of Interlock Using Devices Other Than X And Y - Mitsubishi Electric QJ71GF11-T2 User Manual

(b) Example of interlock using devices other than X and Y
The following shows an example of sending data in W0 to W3 of the master station (station No.0) to W1000 to
W1003 of the local station (station No.1). This is a method used when X and Y cannot be used as interlock
devices.
(B0 and B1000 are used for a handshake to the CPU module.)
Sending station
Program
Master station (Station No.0)
Sending station
1
Local station (Station No.1)
Receiving station
4
Data flow
Send
request
Send data (W)
SET B0
The send request turns on.
1
The contents of D0 to D3 are transferred to W0 to W3.
2
Upon completion of storage in W0 to W3, turn on B0 of the sending station for a handshake.
3
Cyclic transmission sends signals starting from RWw0 following by signals starting from RWwFE0, and B1000
4
of the receiving station is turned on.
The contents of W1000 to W1003 are stored in D0 to D3.
5
Upon completion of storage in D0 to D3, turn on B0 of the receiving station for a handshake.
6
When B1000 of the sending station turns on, turn off B0 of the sending station.
7
When B1000 of the receiving station turns off, turn off B0 of the receiving station.
8
138
Master station (Station No.0)
CPU Master
module station
W0
B0
W1000
B1000
Local station (Station No.1)
Local
station
RWw0 RWw0
RWwFE0 RWwFE0
RWr0 RWr0
RWrFE0 RWrFE0
Receiving station
2
3
7
5
6
8
CPU
module
W0
B1000
B0
W1000
B1000
Receive data (W)
Cyclic transmission
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