National-instruments FP-3000 Manual de usuario descargar pdf (Pagina 37)

Chapter 3 Example Applications

FieldPoint FP-3000 User Manual 3-2 www.ni.com

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 Set the Input Range.

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National-instruments FP-3000 Manual de usuario Pagina 37