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MELSEC-
A
5 PRELIMINARY INFORMATION
5.2 Programming Precautions
5.2.1 About bank changing of the A series master module
When using the R2, the master station's automatic update buffer or
transmission/reception buffer is used.
With the A Series master module (AJ61BT11/A1SJ61BT11), the automatic update
buffer and transmission/reception buffer are divided with banks. When accessing these
buffers, the bank must be changed.
POINT
•
When using dedicated commands (RITO, RIFR, RIRD, RIWT, RISEND,
RIRCV), the bank is changed with the dedicated commands, and does not need
to be changed by the user.
•
After changing to bank 1 or bank 2 and then reading or writing, return to bank 0.
The information such as RX, RY, RWw or RWr will not be updated unless the
bank is changed to bank 0.
A Series master module buffer memory (AJ61BT11/A1SJ61BT11)
Bank 0 Bank 1 Bank 2
Intelligent device
station automatic
update buffer
Parameter, status
information, etc.
Intelligent device
station transmission
/reception buffer
FFF
H
M FFF
H
M FFF
H
M
0
H
M 0
H
M 0
H
M
Q/QnA Series master module buffer memory
(AJ61QBT11/A1SJ61QBT11/QJ61BT11/QJ61BT11N)
Intelligent device
station automatic
update buffer
Parameter, status
information, etc.
Intelligent device
station transmission
/reception buffer
FFF
H
M
1000
H
M
1FFF
H
M
2000
H
M
2FFF
H
M
0
H
M
(1) Changing the bank
The bank can be changed by turning the master module's Y(n+1)C, Y(n+1)D ON
and OFF.
n indicates the master module's head input/output No.
Y (n+1) C Y (n+1) D Details
OFF OFF Change to bank 0
ON OFF Change to bank 1
OFF ON Change to bank 2