Mitsubishi Electric MELSEC-A User Manual page 149

15. MULTIDROP LOCAL STATION
MELSEC-A
15.3.3
Communication
data
Communication data between the master and slave stations is written to the
lower
8
bits of buffer address
10H
to
3FH.
The received data is written to the received data area and data for transmis-
sion must be written to the transmission data area from the sequence program
as illustrated below.
Transmissionlreceived data
=
24 bits each
Upper 8 bits (not used), lower 8 bits
Data re-
ceived from
master
Data transmit-
ted to master
8
point ONIOFF data
(n+7)th point nth point
1 1 1 ' 0 1 0 i s t t o 8 t h p o i n t s
l o 1 9thto16thpoints
I
17th to 24th points
Received data PC
CPU uses FROM in
struction to read
this data from the
buffer memory.
Transmission data
PC CPU uses TO
instruction to write
this data to the
buffer memory.