Chapter 7 Automatic Sending/Receiving function (ASR)
7-3
(2). Receiving area
The receiving area can be specified only by “ASR I/O Area (Connection N) Setting” in EH-ETH2 Configurator.
The receiving area can be defined every ASR connection. Available I/Os are word I/Os except WX.
EH-ETH2 CPU module
Receive Area Information Receiving buffer I/O Receiving area
No. I/O Top Size
H00 DT1 WR0
DT1 DT2
1 WR 0 10
H01 DT2 WR1
DT3 DT4
H02 DT3 WR2
DT5 DT6
H03 DT4 WR3
DT7 DT8
…… …
… …
H12 DT19 WR8
DT17 DT18
H13 DT20 WR9
DT19 DT20
20 Byte 10 Word
Figure 7.4 Receiving area and receiving buffer (1)
Caution
- 1 connection can handle up to 1454 bytes.
- When received data size is less than designated receiving area size, the rest area is not overwritten. The
previous data is kept.
- When received data size is bigger than designated receiving data size, the excess area is omitted
automatically.
Receive Area Information Receiving buffer I/O Receiving area
No. I/O Top Size
H00 DT1 WR0
DT1 DT2
1 WR 0 10
H01 DT2 WR1
DT3 DT4
H02 DT3 …
… …
H03 DT4 WR6
DT13 DT14
…… WR7
DT15 DT16
H0E DT15 WR8
DT(n+1) DT(n)
H0F DT16 WR9
DT(n+3) DT(n+2)
16 Byte 10 Word
: Previous received data
Figure 7.5 Receiving area and receiving buffer (2)
Receive Area Information Receiving buffer I/O Receiving area
No. I/O Top Size
H00 DT1 WR0
DT1 DT2
1 WR 0 10
H01 DT2 WR1
DT3 DT4
H02 DT3 WR2
DT5 DT6
H03 DT4 WR3
DT7 DT8
…… …
… …
H1E
DT31
WR8
DT17 DT18
H1F
DT32
WR9
DT19 DT20
32 Byte 10 Word
: excess data
Figure 7.6 Receiving area and receiving buffer (3)
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