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Rockwell Automation 1770,D17706.5.21 SMART TRANSMITTER TOOLKI User Manual

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Chapter 1

Introducing The Smart Transmitter Toolkit

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You need these hardware and software components to integrate STT with
your new or existing PLC-5 processor:

Hardware

(1 or more) 1770-HT1 Smart Communications Controller(s)
(1 or more) 1770-HT8 or 177-HT16 Terminal Block(s)
(1 or more) HART-compliant field device(s)

Software

PLC-5 6200 Programming Software
(2 or more) PLC-5 data table files
(1 or more ) PLC-5 programming file(s)
PLC-5 integer data table file locations N90:0, N90:1, and N90:2

The STT subroutine greatly simplifies sending and receiving data to and
from HART field devices.

Without STT, the ladder developer must:

✔ Format each command from the HART specification using the Smart

Transmitter Interface protocol.

✔ Understand HART protocol internals, such as long frame addressing vs.

short frame addressing, and byte swapping for word alignment.

✔ Parse HART command responses for data.

✔ Convert IEEE-754 data to floating-point data.

✔ Synchronize BTWs with BTRs.

With STT, the ladder developer must only:

✔ Configure a data block.

✔ Make the appropriate call to the STT subroutine.

What You Need to Use The

STT Subroutine

Why You Should Use The

STT Subroutine