Rockwell Automation 1757-ABRIO Process Remote I/O (RIO) Communication Interface Module - Manual (Page 117)

115 Publication 1757-UM007D-EN-P - December 2008 115
Chapter
9
Accessing HART Data
Introduction This chapter describes how to:
send HART commands using ControlLogix messaging.
access data through a 1770-HT1 module.
Sending HART Commands
Using RSLogix 5000
Software MSG The 1757-ABRIO module can send HART messages cyclically to
devices on the HART network. Messages can be sent a single time
using the AbRioCfg software. In addition, messages can be sent
programmatically from RSLogix 5000 software using the MSG
instruction.
1. Create a tag of type MESSAGE to act as a control tag for the MSG
instruction.
2. Create a tag of type INT and array size large enough to hold the
outgoing message.
3. Create another tag of type INT and array size large enough to
hold the reply.
4. Create a MSG instruction in the RSLogix 5000 software ladder
logic, along with any logic required to control the instruction
execution.
5. Assign the MESSAGE tag you created as the Message Control.