Siemens SIMATIC TI500 Instrukcja Użytkownika Pobierz pdf (Strona 64)

Modbus Commands

C-15

TIWAY I Gateway User Manual

Code

07 instructs the Gateway to read 8 predefined Cs within a secondary

This implementation will read the first 8 Cs in the discrete image register in

a secondary and pack them into one data byte.

NOTE:

The programmer of a non-Modbus PLC must make certain that the

application program running within the PLC will place meaningful data in

these locations. This data can reflect status information.

Example:

I000000

Request: 11 07 XXXX

Checksum (XXXX)

Function code (07)

Slave address (11)

Figur

e C-17

Read

Exception Status Example — Request

This request to secondary 17 (decimal) is asking for exception status data.

I000000

Response: 11 07 3B XXXX

Checksum (XXXX)

Data value (3B)

Function code (07)

Slave address (11)

Figur

e C-18

Read

Exception Status Example — Response

Code 07 — Read

Exception Status

1 2 ... 59 60 61 62 63 64 65 66 67 68 69 ... 93 94

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Siemens SIMATIC TI500 Instrukcja Użytkownika Strona 64