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137
CHAPTER 8 FUNCTIONS
8
8.
1
C
ycl
ic
Tra
n
smi
ssi
on
8.
1.
5
As
suranc
e of
c
yclic
dat
a
int
egr
ity
(3) Interlock program
Data of more than 32 bits can be assured with the Block Data Assurance per Station setting disabled. Use either
of the following methods.
• Interlock using X and Y
• Interlock using devices other than X and Y (when X, Y cannot be used as an interlock device)
(a) Example of interlock using X and Y
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) is shown below. (X1000 and Y1000 are used for a handshake to the CPU module.)
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, turn on Y1000 of the sending station for a handshake.
Cyclic transmission sends RWw followed by RY, and X1000 of the receiving station turns on.
The contents of W1000 to W1003 are stored in D0 to D3.
Upon completion of storage in D0 to D3, turn on Y1000 of the receiving station for a handshake.
When X1000 of the sending station turns on, turn off Y1000 of the sending station.
When X1000 of the receiving station turns off, turn off Y1000 of the receiving station.
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4
5
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3
7
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Cyclic transmission
Link refresh
Data flow
Program
Send
request
SET Y1000
X1000
Y1000
RX0
RY0
RY0
RWw0
RWr0
RWw0
RWr0
RX0
Y1000
W0
W1000
W0
W1000
X1000
CPU
module
Master
station
CPU
module
Master/local module
Local
station
Master/local module
Receiving station
Sending station
Send data (W)
Receive data (W)
X1000
Master station (Station No.0)
Master station (Station No.0)
Local station (Station No.1)
Local station (Station No.1)
Sending station
Receiving station
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