Siemens SIMATIC TI505 Bedienungsanleitung PDF herunterladen (Seite 52)

Modbus Commands

2-21

SIMATIC TI505/TI500 MODNIM User Manual

The

diagnostics codes supported are described in the following paragraphs.

Diagnostic

Code — 00

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 addressed

secondary node without change.

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

This code has no effect on the functioning of the MODNIM.

Diagnostic

Code — 01

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 MODNIM to clear all internal counters and

registers. If the MODNIM had been in Listen Only Mode (LOM), it will be

returned to normal operating mode at the successful conclusion of the

command. 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.

This code has significant effect on the functioning of the MODNIM.

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