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MELSEC-
A
5 PRELIMINARY INFORMATION
(4) When using the RIRD command
This is used only when reading to the R2-designated buffer memory.
When the RIRD command is used, the master station 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) To read error code during transmission and during reception
R2 1B1
H
R2 1B2
H
Programmable controller CPU
Refer to control data (a)
Address
1000
H
to 11FF
H
M
of Q/QnA Series
0
H
to 1FF
H
of A Series bank 1
Address
Address
Q/QnA Series A Series
Bank 1
+
1203
H
M
203
H
M
Bank 1
+
1204
H
M
204
H
M
Master module
(Transmission buffer)
(Reception buffer)
Complete status
Station No., request code
Bank 1
+
1200
H
M
200
H
M
Bank 1
+
1201
H
M
201
H
M
Bank 1
+
1202
H
M
202
H
M
Error code during reception
storage area
Read data
Error code during transmission
Error code during reception
Error code during transmission
storage area
Read data
No. of read data (byte)
R2
R2
(a) Control data
Note that the control data differs between the QCPU (Q mode)/QnACPU
and ACPU/QCPU-A (A mode) as shown below.
One word
each
One word
each
When using ACPU/QCPU-A (A mode) When using QCPU (Q mode)/QnACPU
Control data Control data
Complete status Complete status
Station No.
Access code, attribute Access code, attribute
Buffer memory address
Buffer memory address
No. of read points (word)
No. of read points (word)