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8.
COMMUNICATIONS USING DEDICATED PROTOCOLS
MELSEC-A
8.12
Program Read/Write
This function is used to transfer all types of programs (main and sub-
sequence programs, microcomputer main and sub programs), parameters
and comment data from the PC CPU and store them in the computer. The
computer then carries out the appropriate controls by writing programs,
parameters, and comment data to the PC CPU.
8.1 2.1
Precautions during program readlwrlte
(I) When reading programs that have been written to the PC CPU, read all
sequence programs, microcomputer programs, parameter data, and
comment data from all areas.
When writing programs, write all stored data to the PC CPU. If all areas
have not been written to, the PC CPU will not work correctly.
(2)
Before writing programs, write parameter data and execute a parameter
analysis request. Otherwise, the parameters in the PC CPU user
memory will be changed but the parameters stored in the work area by
the ACPU for operation will remain unchanged.
Therefore, if a
peripheral device is loaded and operated after the parameters are
changed, processing will be carried out with the previous parameters,
which are still stored in the work area.
(3)
The number of points which can be processed per communications is
fixed. When reading or writing data, divide the data into several groups
to read or write the entire area. Parameter data should be divided into
3K
bytes. Other data shoule be divided into units of data determined
by parameter setting.
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