Rockwell Automation 1794-OF8IH FLEX Isolated Input/Output HART Analog Modules - Manual (Page 89)

77 Publication 1794-UM065B-EN-E - September 2010
Chapter
6
Configure Module Messaging
Overview Read this chapter to learn how to:
• configure the module to collect HART data from HART field devices.
• use MSG Instructions to access additional HART data that is cached
within the module
• use MSG Instructions to send a HART message directly to the HART
device using the HART Pass-through mechanism of the module.
In this chapter, we show how to configure the 1794-IF8IH and 1794-OF8IH
HART modules to automatically collect data from the HART field device and
place it in the module's Input Tag. The fields of the Input Tag are described.
Also in this chapter are the methods to access additional HART field device
data by using a MSG instruction. By using these mechanisms, your controller
has easy access to some commonly used data, and with some extra effort,
access to any HART feature. The chapter contains the following main sections:
Table 6.1
Topic Page
HART Configuration Quick Start 78
Pick HART Input Data Format 78
Enable HART 78
Enable Publishing HART Command 3 Variables 79
Accessing HART Data Using CIP Message Instruction (MSG) 79
Fill in The Information Needed for a MSG Instruction 79
Select the Attribute Value for the Operation You Want to Perform 80
Retrieve Additional Information About the HART Device 81
Get Device Info Block 1 Message 82
Get Device Info Block 2 Message 84
Get Device Info Block 3 Message 85
Reset the Device Info Changed Status Bit Message 87
HART Pass through Message Overview 88
Format a HART Pass through Init Request Message 89
Format a "Get Pass through Message Status" Request 90
HART Failed Reason Code 92
Format a "Read Pass through Reply" Request 93
Chapter Summary 94