MITSUBISHI ELECTRIC QJ71C24N - Manual (Page 105)

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MELSEC-Q
4 SETTINGS AND PROCEDURES PRIOR TO OPERATION
(1) Devices
(a) Set the word device of the PLC CPU which stores error and status
information in the setting item field when using the auto refresh function
between the Q series C24 and the PLC CPU.
(b) The devices used must be of the types X, Y, M, L, B, T, C, ST, D, W, R, or
ZR.
If bit devices of types X, Y, M, L, or B are used, a number that can be
divided by 16 points (e.g., X30, Y120, M16, etc.) should be specified. The
buffer memory data is stored in 16 point units from the specified device
number (e.g., if M16 is set, data is stored from M16 to M31).
(c) The device can be set to auto refresh for required information only.
(2) Writing auto refresh settings to QCPU and saving them in a file
(a) Writing auto refresh settings to QCPU
Use online PLC write function of GX Configurator-SC or GX Developer.
(b) Saving in a file
Use the file storage function shown in the file items in the parameter module
selection screen shown in Section 8.3.2. of GX Configurator-SC.
POINT
(1) The auto refresh settings are stored in the intelligent function module
parameter.
After the intelligent function module parameters have been written to the CPU
module, it enables the auto refresh setting by turning the power OFF ON or
by resetting the CPU module.
(2) The auto refresh settings cannot be changed from the sequence program.
However it is possible to add a process similar to auto refresh by using the
FROM/TO command of the sequence program.