Prosoft-technology MVI69-MCM Manual do Utilizador descarregar pdf (Página 141)

MVI69-MCM ♦ CompactLogix or MicroLogix Platform Reference

Modbus Communication Module User Manual

ProSoft Technology, Inc. Page 141 of 167

March 22, 2011

Example and State Diagram

Here is an example of a request to remote device to Return Query Data. This

uses a sub-function code of zero (00 00 hex in the two-byte field). The data to be

returned is sent in the two-byte data field (A5 37 hex).

Request Response

Field Name (Hex) Field Name (Hex)

Function 08 Function 08

Sub-function Hi 00 Sub-function Hi 00

Sub-function Lo 00 Sub-function Lo 00

Data Hi A5 Data Hi A5

Data Lo 37 Data Lo 27

The data fields in responses to other kinds of queries could contain error counts

or other data requested by the sub-function code.

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Prosoft-technology MVI69-MCM Manual do Utilizador Página 141