Rockwell Automation 1770,D17706.5.21 SMART TRANSMITTER TOOLKI - Manual (Page 10)

Chapter 1
Introducing The Smart Transmitter Toolkit
1-3
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