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■Assurance of cyclic data consistency (station-based block data assurance)
The station-based block data assurance function prevents overlapping of previous link scan data and new link scan data in
one station.
Link scan is performed asynchronous to link refresh in the C Controller module. Therefore, if 32-bit or more
cyclic data is handled, new data and old data may overlap due to the timing of link refresh.
Processing of C
Controller module
Link scan
When the station-based block data assurance is set, cyclic data consistency is assured in station units since the C Controller
module does refresh cycle with a network module by handshaking.
C Controller module device
Data assurance
Station No.1
Data assurance
Station No.2
Data assurance
Station No.3
Data assurance
Station No.4
For details of the station-based block data assurance function and the other data assurance functions, refer to the user's
manual for each network module.
Refresh cycle
Refresh cycle
Link refresh
Network module link device
Station No.1
Data assurance
Station No.2
Data assurance
Link refresh
Station No.3
Data assurance
Station No.4
Data assurance
Refresh cycle
Link refresh
Link refresh
5 ACCESS FUNCTION USING NETWORK MODULE
Link refresh
Link refresh time
81
5.2 Cyclic Transmission
5
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