Omron SYSMAC CS1W-SCB41-V1 Operation Manual page 314

Auxiliary Area and CIO Area Allocations (Modbus-RTU Slave Mode)
15 14 13
CIO 0 15 14 13
CIO 1 31 30 29
1 0
CIO 2 47 46 45
CIO 3 63 62 61
Read Holding Registers
Function
Command
Response
Reading 3 Words from
D1000 to D1002
15 14 13
D1000 A
D1001 5
D1002 9
12 11 10 9
12 11 10 9
28 27 26 25
1 1 1 1
44 43 42 41
60 59 58 57
Note The subscript numbers in the shaded boxes indicate the ON/OFF (1/0) status
of the bits that are read.
Reads multiple words from the DM or EM Area of I/O memory.
Function Code
Starting Address
Quantity of Registers 2 bytes
Note The address depends on the area that is allocated.
Function Code
Byte Count
Register Value
Note N = Quantity of Registers
Request
Function Code
Starting Address (H)
Starting Address (L)
Quantity of Registers (H)
Quantity of Registers (L)
12 11 10 9
B
6
7
8 7 6 5
8 7 6 5
24 23 22 21
0 0 1 1
40 39 38 37
1
56 55 54 53
Length
1 byte
2 bytes
Length
1 byte
1 byte
N × 2 bytes
Data
03 hex Function Code
03 hex Byte Count
E8 hex Register Value (H) DM1000
00 hex Register Value (L) DM1000
03 hex Register Value (H) DM1001
Register Value (L) DM1001
Register Value (H) DM1002
Register Value (L) DM1002
8 7 6 5
1
7
1
Section 9-3
4 3 2 1
4 3 2 1
20 19 18 17
0 1
36 35 34 33
0 1 0 1
52 51 50 49
Data
03 hex
0 to 7FFF hex (See note.)
1 to 7D hex
Data
03 hex
N × 2 (See note.)
Response
03 hex
06 hex
AB hex
12 hex
56 hex
78 hex
97 hex
13 hex
4 3 2 1
2
8
3
0
0
16
32
1 0
48
Data
0
285