Omron CJ1W-SCU22, Руководство по эксплуатации, Страница: 266 / 478

7 Using Modbus-RTU Slave Mode
7-16
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
z
Function
Reads multiple words from the DM or EM 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 3 Words from DM 1000 to DM 1002
Read Holding Registers
Length Data
Function Code 1 byte 03 hex
Starting Address 2 bytes 0000 to 7FFF hex (*)
Quantity of Regis-
ters 2 bytes 0001 to 007D hex
Length Data
Function Code 1 byte 03 hex
Byte Count 1 byte N
×
2 (*)
Register Value N
×
2 bytes
Request Response
Data Data
Function Code 03 hex Function Code 03 hex
Starting Address (H) 03 hex Byte Count 06 hex
Starting Address (L) E8 hex Register Value (H) DM1000 AB hex
Quantity of Registers (H) 00 hex Register Value (L) DM1000 12 hex
Quantity of Registers (L) 03 hex Register Value (H) DM1001 56 hex
Register Value (L) DM1001 78 hex
Register Value (H) DM1002 97 hex
Register Value (L) DM1002 13 hex
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
DM1000 A B 1 2
DM1001 5 6 7 8
DM1002 9 7 1 3