Siemens SIMATIC TI505 Manual de usuario descargar pdf (Pagina 50)

Modbus Commands

2-19

SIMATIC TI505/TI500 MODNIM User Manual

Code

08 enables diagnostic information to be retrieved to conduct network

testing. This function does not affect the operation of the PLC, but may have

significant effects on the operation of the MODNIM. Where these effects

impact upon the operation of the MODNIM, they are described with the

details for that diagnostic code.

Because

of differences in memory mapping between Modbus PLCs

and SIMA

TIC TI PLCs, you should be quite certain of the effects of

the broadcast command before issuing it.

Example:

Request: 02 08 0000 B405 XXXX

Checksum (XXXX)

Information Field (B405)

Diagnostic code (0000)

Function code (08)

Slave address (02)

Figure 2-21 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.

Response: 02 08 0000 B405 XXXX

Checksum (XXXX)

Information Field (B405)

Diagnostic code (0000)

Function code (08)

Slave address (02)

Figure 2-22 Execute

Diagnostics Example — Response

Code 08 —

Execute

Diagnostics

WARNING

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Siemens SIMATIC TI505 Manual de usuario Pagina 50