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7 Using Modbus-RTU Slave Mode
7-14
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
z
Function
Reads multiple bits from the CIO, Work, Holding, or Auxiliary Area of the memory used for CJ-series
Unit.
z
Command
* The address depends on the area that is allocated.
z
Response
* N=Quantity of Registers
z
Reading 19 Bits from CIO 0001.04 to CIO 0002.06
Note
Unused bits are filled with zeros.
Note
The subscript numbers in the shaded boxes indicate the TRUE/FALSE (1/0) status of the bits
that are read.
7-3-2
Command and Response Details
Read Coils
Length
Data
Function Code
1 byte
01 hex
Starting Address
2 bytes
0000 to FFFF hex (*)
Quantity of Coils
2 bytes
0001 to 03E8 hex (1 to 1000)
Length
Data
Function Code
1 byte
01 hex
Byte Count
1 byte
N (*)
Coil Status
n byte
n = N or N+1
Request
Response
Data
Data
Function Code
01 hex
Function Code
01 hex
Starting Address (H)
00 hex
Byte Count
03 hex
Starting Address (L)
14 hex
Coil Status 27 to 20
CD hex
Quantity of Coils (H)
00 hex
Coil Status 35 to 28
6B hex
Quantity of Coils (L)
13 hex
Coil Status 38 to 36
05 hex
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
CIO 0
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
CIO 1
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
CIO 2
47
46
45
44
43
42
41
40
39
38
1
37
0
36
1
35
0
34
1
33
1
32
0
CIO 3
63
62
61
60
59
58
57
56
55
54
53
52
51
50
49
48
Содержание CJ1W-SCU22
Страница 192: ...4 Using Protocol Macros 4 56 CJ series Serial Communications Units Operation Manual for NJ series CPU Unit W494...
Страница 250: ...6 No protocol Mode 6 22 CJ series Serial Communications Units Operation Manual for NJ series CPU Unit W494...
Страница 460: ...A Standard System Protocol R 126 CJ series Serial Communications Units Operation Manual for NJ series CPU Unit W494...
Страница 473: ...Index 1 CJ series Serial Communications Units Operation Manual for NJ series CPU Unit W494 I Index...