
17 (70)
5.1
Read Coils
Function Code:
1
Register Type:
0x (Coils)
Details
This function is mapped to the Read Process data as follows:
Coil #
Process Data Byte
#
Bit #
0000h
0000h
0
0001h
1
0002h
2
0003h
3
...
...
0007h
7
0008h
0001h
0
0009h
1
000Ah
2
000Bh
3
...
...
000Fh
7
...
...
...
2FF8h
05FFh
0
2FF9h
1
2FFAh
2
2FFBh
3
...
...
2FFFh
7
5.2
Read Discrete Inputs
Function Code:
2
Register Type:
1x (Discrete Inputs)
Details
This function is mapped to the Write Process data; the mapping is otherwise identical to that of
the “Read Coils” function described above.
5.3
Read Holding Registers
Function Code:
3
Register Type:
4x (Holding Registers)
Details
Mapped to Read- and Write Process Data, ADIs, and configuration registers. It is allowed to
read parts of a larger Anybus CompactCom data type; it is also allowed to read multiple ADIs
using a single request.
Anybus
®
CompactCom
™
40 Modbus-TCP
®
Transparent Ethernet Network Guide
SCM-1202-022 1.1