Modbus Error Response (For Modbus Slave) - YOKOGAWA XL100 User Manual

4.3

Modbus Error Response (for Modbus Slave)

IM XL100C-E
When using the Modbus slave function, the XL100 returns the error codes below to the
master device. For the error messages related to communications that the XL100
displays, see chapter 8, "Error Messages."
Code Meaning
1 Bad function code
2 Bad register number
3 Bad number of registers
However, no response is returned in the following cases.
• CRC error
• Errors other than those in the above list.
Cause
Unsupported function request. For a list of supported
functions, see section 4.1, "Modbus Protocol Specifications
and Function Codes."
Attempted to read/write to a register that has no
corresponding channel.
The specified number of registers is zero.
1
2
3
4
5
6
7
App
Index
4-3