Mitsubishi Electric MELSEC iQ-F FX5 User Manual page 39

Station-based Block Data Assurance
Cyclic data may be separated between new and old data depending on the timing of the link refresh. This function prevents
read/write data per slave station from being separated between new and old data. Because module parameters are
configured only on an engineering tool, a program to prevent data separation is not required.
For each slave station, data assurance is provided to data in RX, RY, RWr, and RWw that are automatically transferred to a
CPU module or remote head module (link refresh) by setting the refresh device of the module parameter.
■Setting
Set station-based block data assurance under "Supplementary Cyclic Settings" in "Application Settings." (Page 71
Supplementary cyclic settings)
Sets to the master/intelligent device module to assure data.
■Operation of a data assurance
Identity of data per slave station is assured as follows.
Ex.
To assure data of the remote stations with the number of occupied stations of 3 and 1 (when operating as a master station)
CPU module
Device
Station No.1

Data assured
Station No.3
Data assured
Station No.4
To assure data of the remote stations with the number of occupied stations of 3 and 1 (when operating as an intelligent device
station)
Remote station
(station No.: 1,
number of occupied
stations: 3)
Master station
Station No.1 Station No.1
 
Station No.3 Station No.3
Station No.4
■Precautions
• When using station-based block data assurance, set the refresh devices in the module parameter. If the refresh devices are
not set, the remote input (RX), remote output (RY), and remote register (RWr, RWw) of the buffer memory may not be
refreshed.
• When station-based block data assurance is used, transmission delay time and link refresh time become longer than those
of when station-based block data assurance is not used. When designing a system based on an existing system, check the
transmission delay time and link refresh time at startup of the system. (Page 157 Processing Time)
Integrity of 32-bit data in remote register (RWr and RWw) is assured even if station-based block data
assurance is not set. (Assurance of 32-bit data) (Page 36 32-bit data integrity assurance)
Master/intelligent
device module
Master station
Station No.1

Link refresh
Station No.3
Station No.4
Master/intelligent device module
Intelligent device station
(station No.: 4,
number of occupied stations: 1)
Station No.4
Remote station Remote station
(station No.: 1, (station No.: 4,
number of occupied number of occupied
stations: 3) stations: 1)
Station No.1

Station No.3
Station No.4
CPU module
Device
Link refresh
Station No.4 Data assured
4 FUNCTIONS
4.2 Cyclic Transmission
4
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