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MELSEC-
A
6 SEQUENCE PROGRAM USED FOR POSITIONING CONTROL
(c) When using the RIRD command
This is used only when reading to the D75P2-designated buffer memory.
When the RIRD command is used, the master module buffer memory is
used for the control data size transmission buffer, and the master module
buffer memory is used for the read data size reception buffer.
(Example) To read error code during transmission and during reception
802(322
H
)
803(323
H
)
PLC CPU
Address
1000
H
to 11FF
H
M
Address
Address
1203
H
M
1204
H
M
Master module
(Transmission buffer)
(Reception buffer)
Complete status
Station No., request code
1200
H
M
1201
H
M
1202
H
M
Read data
Axis 1 machine feed value
Axis 1 machine feed value
Read data
No. of read data (byte)
D75P2
Complete status
Station No.
Access code, attribute
Buffer memory address
Number of read points (word)
Control
data