Spectrum-controls 1734sc-OE2CIH Manual do Utilizador descarregar pdf (Página 37)

User’s Manual Pub. 0300272-01 Rev. A.0

Chapter 4

OE2CIH and HART

This chapter describes how to read and write HART data using the OE2CIH module. The

chapter includes the following sections:

 HART features

 Detecting HART devices

 Auto scanning of HART dynamic variables

 Supported HART CIP messages

Section 4.1

HART Features

The OE2CIH module functions as a HART master and communicates with HART

devices running HART revision 5 or greater. The OE2CIH module includes one HART

modem per channel to provide maximum acquisition speed and flexibility.

The HART transmitter and receiver conform to the HART Foundation’s physical layer

specification for a HART primary master. These specifications include AC P-P voltage

digital transmission bandwidth, analog signal bandwidth, wave shape, and a capacitive

drive.

The module performs the following HART operations:

 Automatically reads the four dynamic HART variables; PV, SV, TV, and FV.

 Automatically retrieves and stores HART device information, including

manufacturer’s ID device tag name, HART revision level, etc., and makes the

information available via a CIP unconnected message.

 Automatically retrieves and stores extended device status using HART

Command 48. The extended status can be retrieved using an unconnected CIP

message.

 Provides a HART pass-through interface using CIP unconnected messaging to

allow you or a remote client to send a HART command to a HART on any

channel.

Section 4.2

Detecting HART

Devices

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Spectrum-controls 1734sc-OE2CIH Manual do Utilizador Página 37