1 FUNCTIONS
1.1 Cyclic Transmission
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Station-based block data assurance
Integrity of the cyclic data is assured for each station by handshake between the CPU module and master/local module for a
link refresh.
■Setting
Set station-based block data assurance under "Supplementary Cyclic Settings" in "Application Settings" of the master station.
( Page 137 Application Settings)
Once this setting is enabled on the master station, integrity of the data for all stations is assured for each station.
■Access to link devices
During a link refresh, data are assured for each station as shown below.
Interlock program
Data of more than 32 bits can be assured with the station-based block data assurance 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)
■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.)
• Data flow
Station
No.1
Station
No.2
Station
No.3
Station
No.4
Data
assurance
Data
assurance
Data
assurance
Data
assurance
Data
assurance
Data
assurance
Data
assurance
Data
assurance
Station
No.1
Station
No.2
Station
No.3
Station
No.4
Link device
Master/local module
Device
CPU module
Link refresh
Master/local module
Master/local module
Receiving stationSending station
Master station
(station No.0)
Local station
(station No.1)
SET Y1000
X1000
Y1000
RX0
RY0RY0
RWw0
RWr0
RWw0
RWr0
RX0
Y1000
W0
W1000
W0
W1000
X1000
X1000
Send
request
Send data (W)
CPU
module
Master
station
CPU
module
Local
station
Cyclic transmission
Link refresh
Receive data (W)
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