Omron CJ1W-SCU32 Operation Manual page 272

7 Using Modbus-RTU Slave Mode
Response
Function Code
Starting Address
Quantity of Regis-
ters
Writing 3AC5 and 9713 Hex to 2 Words, DM1000 and DM1001
Request
Function Code
Starting Address (H)
Starting Address (L)
Quantity of Registers (H)
Quantity of Registers (L)
Byte Count
Registers Value (H)
Registers Value (L)
Registers Value (H)
Registers Value (L)
15 14 13
DM1000 3
DM1001 9
Error Format
Function Code
Exception Code
Error
code
01 Illegal function
02 Illegal data address • There is an error in the specified starting address.
03 Illegal data value
04 Slave device failure • Reading or writing could not be performed
7-22
Length
1 byte
2 bytes
2 bytes
Data
10 hex Function Code
03 hex Starting Address (H)
E8 hex Starting Address (L)
00 hex Quantity of Registers (H)
02 hex Quantity of Registers (L)
04 hex
3A hex
C5 hex
97 hex
13 hex
12 11 10 9
A
7
Length
1 byte
1 byte
Name
• There is an error in the specified function code.
• A function code not supported by the Serial Com-
munications Unit was specified.
• The combination of the specified starting address
and data length (quantity of registers/coils)
exceeds the valid range.
• The specified data length (quantity of regis-
ters/coils) exceeds the valid range.
• The specified data length (quantity of regis-
ters/coils) differs from the actual data length.
• Less than 4 bytes of data was received.
• There is an error in the specified data. (The data
for the Write Single Coil Command is not 0000 hex
or FF00 hex.)
because an error occurred in the CPU Unit.
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
Data
10 hex
0000 to 17FF hex
0001 to 007B hex
Response
Data
10 hex
03 hex
E8 hex
00 hex
02 hex
8 7 6 5 4
C
1
Data
Function code + 80 hex
Error code
Description
3 2 1 0
5
3