Siemens SIMATIC TI500 - Code 08 - Execute Diagnostics; Execute Diagnostics Example - Request; Execute Diagnostics Example - Response

Modbus Commands
C-17
TIWAY I Gateway User Manual
Code 08 enables diagnostic information to be retrieved to conduct network
testing. This function does not affect the operation of the PLC.
Example:
I000000
Request: 02 08 0000 B405 XXXX
Checksum (XXXX)
Information Field (B405)
Diagnostic code (0000)
Function code (08)
Slave address (02)
Figur e C-20 Execute Diagnostics Example — Request
This example shows a request to conduct diagnostic test 0000. This is the
loopback query , where the outgoing message field is returned unchanged.
I000000
Response: 02 08 0000 B405 XXXX
Checksum (XXXX)
Information Field (B405)
Diagnostic code (0000)
Function code (08)
Slave address (02)
Figur e C-21 Execute Diagnostics Example — Response
Code 08 —
Execute
Diagnostics