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MELSEC-
A
5 PRELIMINARY INFORMATION
(6) Using the FROM command (Not available when using QCPU (Q
mode))
This is used to read the R2-designated buffer memory.
When the FROM command is used, the transmission buffer (master module
buffer memory) for the control data size, and the reception buffer (master module
buffer memory) for the read data size are used.
The data designated with the transmission buffer is read from the R2 buffer
memory using the intelligent device station access request signal and complete
signal (RY(n+1)E and RX(n+1)E).
(Example) Reading the error information
R2
....
Intelligent device station
access request signal
(RY(n+1)E)
FROM command
execution
Intelligent device station
access complete signal
(RX(n+1)E)
Bank 1
+
1006
H
M
6
H
M
Bank 1
+
1005
H
M
5
H
M
Bank 1
+
1004
H
M
4
H
M
Bank 1
+
1003
H
M
3
H
M
Bank 1
+
1002
H
M
2
H
M
Bank 1
+
1001
H
M
1
H
M
Bank 1
+
1000
H
M
0
H
M
Address
QnA Series A Series
Master module
(Transmission buffer)
Control
data
Dummy area
Station No., request code
Transmission buffer write
data size (byte)
Quantity
Access code, attribute
Buffer memory address
No. of write points (word)
R2 1A8
H
R2 1A9
H
Address
Bank 1
+
1203
H
M
203
H
M
Bank 1
+
1204
H
M
204
H
M
(Reception buffer)
Complete status
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
R2 1B1
H
R2 1B2
H
Bank 1
+
1212
H
M
212
H
M
Bank 1
+
1213
H
M
213
H
M
Station No., request code
No. of read data (byte)
....
....
Error code history
Error code history
Error code history storage
area
R2 buffer memory
read request
Read process
completion
R2 buffer memory
read completion
Control
data
....
*
1
*
2