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MELSEC-Q
5 PARAMETER SETTINGS
5.1.5 Refresh parameters
The refresh parameters are used to transfer the link device data (LB, LW, LX, LY) of
the network module to the devices (X, Y, M, L, T, B, C, ST, D, W, R, ZR) of the CPU
module for operation of the sequence programs.
By eliminating the link refresh of those link devices that are not used by the sequence
programs, the scan time can also be reduced.
Because it is not necessary to transfer the link devices to different devices with the
sequence programs, the number of program steps is reduced and easy-to-understand
programs can be created.
POINT
Note that there are no default settings for LX/LY points in the refresh parameters.
A CPU that does not have the number of points set cannot input and output
network link device LX/LY.
(Refresh parameter setting screen)
The assignment status of the above refresh parameters can be checked with the
assignment image diagram.
The assignment image diagram shows the device assignments made between the
CPU module and the modules set for the No. of module setting.
X15FF
X1FFF
CPU module
Master module 1 Master module 2
Duplicate
Not possible
LX3FFF LX3FFF
LX15FF
LX19FF
LX1000LX1000
to
toto
X1000
X19FF
Using the assignment image diagram, assignment errors and duplicate settings
between the modules can also be checked.
It is a convenient tool to view the assignment status when setting or changing the
network refresh parameters.