Siemens SIMATIC TI500 Manual de usuario descargar pdf (Pagina 68)

Modbus Commands

C-19

TIWAY I Gateway User Manual

The

diagnostics codes supported are described in the following paragraphs.

Diagnostic

Code — 00

I000000

0000 | any

data

Diagnostic code

Information frame

When

Function Code 08 uses diagnostic code 0000, any data passed in the

information field is returned to the host computer by the Gateway

. The

Gateway will send Primitive 02 to the secondary

. If the secondary has a

fatal error

, communications loopback is not performed to indicate fatal error

The purpose of this command is to determine if the communications are

functioning correctly

, and may be used in conjunction with diagnostic tests

described later

Diagnostic

Code — 01

I000000

0001 | 00

0001 |

FF 00

Diagnostic code

Information frame

When

Function Code 08 uses diagnostic code 0001, the information frame

can contain 0000 or FF00. This function causes the Gateway to clear all

internal counters and registers. If the information frame contains FF00, the

Communications Event Log will be cleared. If any other value is passed in

the information field, the Communications Event Log will not be cleared,

and no response will be returned.

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Siemens SIMATIC TI500 Manual de usuario Pagina 68