5 ACCESS FUNCTION USING NETWORK MODULE
5.2 Cyclic Transmission
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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.
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.
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
Refresh cycle
Processing of C
Controller module
Link refresh
Link refresh
Link refresh
Link refresh
Link scan
Link refresh time
Network module link device
C Controller module device
Data assurance
Station No.1
Data assurance
Station No.1
Station No.2
Data assurance
Data assurance
Station No.2
Link refresh
Station No.3
Data assurance
Data assurance
Station No.3
Station No.4
Data assurance
Data assurance
Station No.4
Summary of Contents for MELSEC iQ-R C R12CCPU-V
Page 1: ...MELSEC iQ R C Controller Module User s Manual Application R12CCPU V ...
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Page 23: ...1 EXECUTING PROGRAMS 1 3 I O Access Timing 21 1 MEMO ...
Page 32: ...30 3 MEMORY CONFIGURATION OF C Controller Module 3 4 Files MEMO ...
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