Getting started, Getting started -2 – National Instruments FP-3000 User Manual
Page 37
Chapter 3
Example Applications
FieldPoint FP-3000 User Manual
3-2
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If you need more help setting up your network, refer to the NI-FBUS
Configurator User Manual.
Example 1: Converting a 4–20 mA Pressure Sensor to
Fieldbus Using FP-3000
One common application of the FP-3000 is interfacing to a conventional
device, such as a 4-20 mA pressure sensor or a 4-20 mA temperature
transmitter. This example helps you configure the FP-3000 to interface to
a 4-20 mA pressure sensor. In this example, you instantiate an AI function
block, assign a tag to the block, set up scaling parameters and range for the
I/O channel, schedule the function block, and download the configuration
to the FP-3000.
Getting Started
Example 1 requires the following materials:
•
4–20 mA sensor, such as a pressure sensor. If you do not have a sensor
you will not be able to make measurements, but can still use this
exercise to practice setting up a Fieldbus configuration.
•
FP-3000 network module.
•
Terminal base connected to FP-3000
•
FP-AI-100, FP-AI-110, or FP-AI-111 module installed in terminal
base (this example assumes you are using the FP-AI-110 module).
•
Host configuration system capable of instantiating function blocks on
devices (such as National Instruments NI-FBUS Configurator).
Wire the 4–20 mA current loop into a current source input for the
FP-AI-110 terminals. To determine which terminals to use for channel
zero, refer to the wiring diagram in the Operating Instructions that came
with your FP-AI-110 module. Make sure your current loop is powered and
the sensor is operating normally.
Tip
If you autoconfigured your FP-3000, you can skip to the section
.