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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 station
buffer memory is used for the read data size reception buffer.
(Example) Reading the axis 1 machine feed value
Master module
(Transmission buffer)
Address
Bank 1 0
H
to 1FF
H
M
(Reception buffer)
Complete status
Station No., request code
Number of read data (byte)
Read data
802(322H)
Address
Address
Bank 1 + 200
HM
Bank 1 + 201
H
M
Bank 1 + 202
H
M
Bank 1 + 203
H
M
Bank 1 + 204
H
M
D75P2
Axis 1 machine
feed value
803(323
H)
PLC CPU
Read data
Control
data
Axis 1 machine feed value
Complete status
Number of read points (word)
Access code, attribute
Buffer memory address