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(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 (safety station) (station No.
0) to W600 to W603 of the local station (station No. 1). This is a method used when X and Y cannot be used as
interlock devices.
(B0 and B600 are used for a handshake to the safety CPU modules of RWr and RYWw.)
When the data are sent to the receiving station, Y1000 at the sending station is turned off.
When X1000 at the receiving station turns off, Y1000 at the receiving station is turned off.
The send request turns on.
The contents of D0 to D3 are transferred to W0 to W3.
Upon completion of storage in W0 to W3, B0 at the sending station for a handshake is turned on.
7
8
1
4 5
2
3
7
6
8
Cyclic transmission
Link refresh
Send
request
SET B0
RWw0
RWr0
RWrFE0
RWw0
RWr0
RWrFE0
RWwFE0 RWwFE0
W0
B0
B600
W600
W0
B0
B600
W600
Safety CPU
module
Master station
(safety station)
Safety CPU
module
Master/local module
Local
station
Master/local module
Send data (W)
Receive data (W)
B600
Receiving stationSending station
Master station (safety station) (Station No. 0)
Master station (safety station) (Station No. 0)
Local station (Station No. 1)
Local station (Station No. 1)
Data flow
Program
Sending station
Receiving station
1
2
3