Melsecnet/Mini-S3 Auto Refresh Processing - Mitsubishi Electric MELCEC Q Series User Manual

4. CPU MODULE
4.2.6

MELSECNET/MINI-S3 auto refresh processing

By setting link information, I/O storage device, etc. of the MELSECNET/MINI-S3 to the
parameters, the module automatically communicates with the buffer memory area for the
batch refresh send/received data of the A1SJ71PT32-S3/AJ71PT32-S3 master module
(abbreviated as the master module hereafter).
Sequence programs can be created using the I/O devices allocated to send/received by
the auto refresh setting. (The FROM/TO instructions are not required.)
POINT
(1) Since up to 8 master modules can be set for auto refresh by the parameter,
auto refresh is possible for up to 8 modules.
When 9 or more modules are desired, use the FROM/TO instruction in the
sequence program from the 9th module.
(2) Since auto refresh is not possible with send/received data for the separate
refresh I/O modules and for the remote terminal modules No.1 to No.14, use
them by the FROM/TO instructions.
However, the remote terminal modules shown below are subject of auto
refresh in the limited area:
AJ35PTF-R2 RS-232C interface module
AJ35PT-OPB-M1-S3 mount-type tool box
AJ35PT-OPB-P1-S3 portable type tool box
(3) For the master modules set up for auto refresh, since the CPU module
automatically turns on the link communication start signal Y(n+18) or
Y(n+28), it is not necessary to turn it on from the sequence program.
(4) Auto refresh of I/O data is performed by batch after the CPU module
executes the END instruction. (Auto refresh processing is performed when
the CPU module is in the RUN/PAUSE/STEP-RUN status.)
(5) The master module may perform the processing while the link
communication start signal Y(n+28) is off depending on the remote terminal
modules connected.
For instance, if the AJ35PTF-R2 RS-232C interface module is used without
protocol, it is necessary to write parameters to the parameter area (buffer
memory address 860 to 929) while the link communication start signal is off.
Since the link communication start signal turns on after the CPU module
enters the RUN status and one scan is performed, write the parameters
during the first 1 scan.
Link communication start signal OFF
Y(n+28)
ON
M9038
1 scan
CPU module RUN
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ON
OFF