MANUEL STA46 Modbus TCP
JP Viskovic 30/08/2005 OEE-F 6
1-4 Function Code
1-4-0 I/O memory area (CIO) Read Multiple Coils
[Function]
Reads coils in I/O memory area.
[Request]
Length Data
Function Code 1 Byte
0x01
Starting Address 2 Bytes 0x0000-0xFFFF
Quantity of Coils 2 Bytes 1-2000(0x7D0)
[Response]
Length Data
Function Code 1 Byte
0x01
Byte Count 1 Byte N
Coil Status n Byte n = N or N+1
Example: read 19 bits (CIO 0001.04 to 0002.06)
Request Response
Data
Data
Function Code 0x01 Function Code 0x01
Starting Address(H) 0x00 Byte Count 0x03
Starting Address(L)
0x14
Coil Status 27-20 0xCD
Quantity of Coils(H) 0x00 Coil Status 35-28 0x6B
Quantity of Coils(L) 0x13 Coil Status 38-36 0x05
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
0CH 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
1CH
31
1
30
0
29
1
28
1
27
1
26
1
25
0
24
0
23
1
22
1
21
0
20
1
19 18 17 16
2CH 47 46 45 44 43 42 41 40 39
38
1
37
0
36
1
35
0
34
1
33
1
32
0
3CH 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48
Italic characters show the ON/OFF(1/0) status of its bit condition.
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