Omron E5AR-T User Manual page 213

Section 7 Modbus Communications
● Response Codes
● Reading Non-display Data
7-12
Function Error
Error name
code code
Variable address
H'02
error
Variable data
H'03
error
H'83
Operation error
H'04
H'03 Normal end
Set values can be read even if the parameters are set not to be
displayed or are not displayed due to the model.
Command/Response Example
Reading the PV of Channel 1
(Slave address: H'01)
PV of channel 1 (read-only data)
Address: H'0404
Data read: H'000003E8 (100.0°C)
Command: 01 03 0404
04
Response: 01 03
Cause
Error in the read start address.
The number of elements
exceeds the specified range.
Unit error, unit change, display
unit error, or EEPROM error
(does not occur when number
of elements is 0).
No error.
(CRC-16)
00 02
(CRC-16)
00 00 03 E8