Omron CJ1W-SCU32 Operation Manual page 267

Read Input Registers
Function
Reads multiple words from the CIO, Work, Holding, or Auxiliary Area of the memory used for CJ-
series Unit.
Command
Function Code
Starting Address
Quantity of Regis-
ters
* The address depends on the area that is allocated.
Response
Function Code
Byte Count
Register Value
* N = Quantity of Registers
Reading 3 Words from DM 1000 to DM 1002
Request
Function Code
Starting Address (H)
Starting Address (L)
Quantity of Registers (H)
Quantity of Registers (L)
15 14 13
DM1000 A
5
DM1001
DM1002 9
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
Length
1 byte
2 bytes
2 bytes
Length
1 byte
1 byte
N × 2 bytes
Data
04 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
12 11 10 9 8
B
6
7
7 Using Modbus-RTU Slave Mode
Data
04 hex
0000 to 17FF hex (*)
0001 to 007D hex
Data
04 hex
N × 2 (*)
Response
Data
04 hex
06 hex
AB hex
12 hex
56 hex
78 hex
97 hex
13 hex
7 6 5 4
1
7
1
3 2 1 0
2
8
3
7-17
7