Cyclic Data Assurance - Mitsubishi Electric MELSEC-Q Series User Manual

8.2.6

Cyclic data assurance

This function prevents read/write data from being separated between new and old data.
Before using this function, check the versions of the master/local module and programming tool. (
6 (2))
(1) Block data assurance per station
Cyclic data may be separated between new and old data depending on the timing of the automatic refresh. This
function prevents read/write data per slave station from being separated between new and old data. Because the
setting is configured only on a programming tool, a program to prevent data separation is not required.
(a) Data to be assured
This function is applicable to data automatically transferred to a CPU module (automatic refresh) by setting the
refresh device of the network parameter.
Data in RX, RY, RWr, and RWw are assured per slave station.
(b) Operation of a data assurance
Identity of data per slave station is assured as follows.
To assure data of the remote stations with the number of occupied stations of 3 and 1
Ex.
CPU module
Station No.1
Data
guaranteed
station No.3
Data
Station No.4
guaranteed
150
device Master/local module
to the
Auto refresh
Remote station
(Station No.1,
the number of
occupied stations: 3)
Station No.1 Station No.1
to the
station No.3 station No.3
Station No.4
Page 399, Appendix
Remote station
(Station No.4,
the number of
occupied stations: 1)
to the
Station No.4