3 - 15 3 - 15
MELSEC-Q
3 SPECIFICATIONS
3.4.2 Buffer memory detailed description
(1) INPUT area (Buffer memory address: 0 (0
H
) to 959 (3BF
H
))
Either the normal service mode (Mode 0) or extended service mode (Mode E)
can be selected using GX Configurator-DP.
(a) Normal service mode (MODE 0)
This is the area that stores the input data from the slave station.
This area is fixed to an allocation of 32 bytes (16 words) per station for a
total of 60 stations worth. This input area configuration is as follows.
Example : When the input data length for the first station is set to 29 bytes
and that for the second station to 32 bytes
1st station input data
2nd station input data
n th station input data
60th station input data
1st station 2nd byte
1st station 4th byte
1st station 1st byte
1st station 3rd byte
1st station 29th byte
b15
b0
2nd station 2nd byte
2nd station 4th byte
2nd station 1st byte
2nd station 3rd byte
2nd station 30th byte
2nd station 32nd byte
2nd station 29th byte
2nd station 31st byte
b15
b0
(Upper byte)
(Lower byte)
: Free area (00
H
)
1 Since the data area is fixed to 32 bytes,
all unused areas will become free.
1
0(0
H
)
15(F
H
)
16(10
H
)
31(1F
H
)
944(3B0
H
)
959(3BF
H
)
0(0
H
)
1(1
H
)
14(E
H
)
15(F
H
)
16(10
H
)
17(11
H
)
30(1E
H
)
31(1F
H
)
1
Buffer memory
address decimal
(Hexadecimal)
Buffer memory
address decimal
(Hexadecimal)
