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What you get with the stt subroutine – Rockwell Automation 1770,D17706.5.21 SMART TRANSMITTER TOOLKI User Manual

Page 9

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Chapter 1

Introducing The Smart Transmitter Toolkit

1-2

The STT subroutine transfers this digital data between the PLC-5
processor and HART field devices:

Read

- primary variable and unit
- primary variable current
- dynamic variables and unit
- status information

Write/modify primary variable range values
Write primary variable unit
Reset configuration change flag
Set primary variable to zero

Data Highway Plus

PLCĆ5 Processor

Workstation

You Provide

STT Provides

Your Application Program

PLCĆresident Control Functions

STT Data Tables and

Subroutine Call

6200 Programming Software

PLCĆ5 ladder logic subroutine

that simplifies the communication

between a PLCĆ5 processor and

a HART field device.

HART

Field

Devices

4-20 mA Loop

1770ĆHT1

1770ĆHT16

Smart Transmitter Interface

RIO

What You Get With The STT

Subroutine