Rockwell Automation 1770,D17706.5.21 SMART TRANSMITTER TOOLKI - Manual (Page 26)

Chapter 3
Using The Smart Transmitter Toolkit
3-7
In this example, the primary variable is being read continuously from a
single HART field device.
PLCĆ5 Processor
HART
Field
Device
4-20 mA Loop
1770ĆHT1
1770ĆHT16
Smart Transmitter Interface
RIO
Because we’re dealing with one device we can execute the JSR with a
fixed device data file number. In the course of operation if the device does
not respond, we reissue HART command 0 to try and get a new HART
address for the device.
Important: This example assumes that data table files N10 and F11 exist,
and N10 is populated with the standard inputs for HART command 0 prior
to the execution of this logic. The primary variable value is placed in
F11:10 and the primary variable unit code is placed in N10:40.
Programming Example 1:
Single HART Device With
Single 1770ĆHT1