Black Box IC108A Guia do Utilizador descarregar pdf (Página 113)

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Smart Device (HART

) Interface User’s Guide

Section A.1.2 PLC_MODBUS Initial Data Base

3BUR 001 085R0001 REV A A-3

A.1.2 PLC_MODBUS Initial Data Base

This PLC_CMDS object from which all other databases are initially copied and created contains

commands which are used to communicate with Modicon programmable controller devices

using MODBUSB (binary) protocol. The TEMPLET NAME of this object is used as the

COMMAND SET field entry in the PLC_DEF object (see Section 3.3.5.3, PLC_DEF Object).

Each command (name) corresponds to a code (value) that us used by the MVI module to

produce the correct protocol to the PC device for the function desired.

NOTE

A non-configurable command (Code 08) is sent by the MODBUS MVI board

which is a Loopback Diagnostic Check command. Devices connected to the MVI

must be able to respond to this command.

WARNING

THIS OBJECT IS FOR DATA BASE REFERENCE ONLY AND IS NOT TO BE

MODIFIED BY THE USER.

Figure A-3. PLC_MODBUS Reference Object

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Black Box IC108A Guia do Utilizador Página 113