National Instruments cFP-Al-110, FP-Al-110 User Manual

FieldPoint™ Operating Instructions

FP-AI-110 and cFP-AI-110

Eight-Channel, 16-Bit Analog Input Modules

These operating instructions describe how to install and use the FP-AI-110 and cFP-AI-110 analog input modules (referred to inclusively as the [c]FP-AI-110). For information about configuring and accessing the [c]FP-AI-110 over a network, refer to the user manual for the FieldPoint network module you are using.

Features

The [c]FP-AI-110 is a FieldPoint analog input module with the following features:

• Eight analog voltage or current input channels

• Eight voltage input ranges: 0–1 V, 0–5 V, 0–10 V, ±60 mV, ±300 mV, ±1V, ±5V, and ±10 V

• Three current input ranges: 0–20, 4 –20, and ±20 mA

• 16-bit resolution

• Three filter settings: 50, 60, and 500 Hz

• 250 V verified by 2,300 V

• –40 to 70 °C operation

• Hot swappable

CAT II continuous channel-to-ground isolation,

rms

dielectric withstand test

rms

Installing the FP-AI-110

The FP-AI-110 mounts on a FieldPoint terminal base (FP-TB-x), which provides operating power to the module. Installing the FP-AI-110 onto a powered terminal base does not disrupt the operation of the FieldPoint bank.

To install the FP-AI-110, refer to Figure 1 and complete the following steps:

1. Slide the terminal base key to either position X (used for any module) or position 1 (used for the FP-AI-110).

2. Align the FP-AI-110 alignment slots with the guide rails on the terminal base.

3. Press firmly to seat the FP-AI-110 on the terminal base. When the FP-AI-110 is firmly seated, the latch on the terminal base locks it into place.

1 I/O Module 2 Terminal Base 3 Alignment Slot

4Key 5Latch 6 Guide Rails

Figure 1. Installing the FP-AI-110

Installing the cFP-AI-110

The cFP-AI-110 mounts on a Compact FieldPoint backplane (cFP-BP-x), which provides operating power to the module. Installing the cFP-AI-110 onto a powered backplane does not disrupt the operation of the FieldPoint bank.

To install the cFP-AI-110, refer to Figure 2 and complete the following steps:

1. Align the captive screws on the cFP-AI-110 with the holes on the backplane. The alignment keys on the cFP-AI-110 prevent backward insertion.

2. Press firmly to seat the cFP-AI-110 on the backplane.

3. Using a number 2 Phillips screwdriver with a shank of at least 64 mm (2.5 in.) length, tighten the captive screws to 1.1 N ⋅ m

FP-AI-110 and cFP-AI-110 2 ni.com

(10 lb ⋅ in.) of torque. The nylon coating on the screws prevents them from loosening.

3 5

1cFP-DI-300 2Captive Screws 3 cFP Controller Module

Figure 2. Installing the cFP-AI-110

4 Screw Holes 5cFP Backplane

Wiring the [c]FP-AI-110

The FP-TB-x terminal base has connections for each of the eight input channels and for an external power supply to power field devices. The cFP-CB-x connector block provides the same connections. Each channel has separate input terminals for voltage (V

) and current (IIN) input. Voltage and current inputs are

referenced to the COM terminals, which are internally connected to each other and to the C terminals. All eight V

terminals are

SUP

internally connected to each other and to the V terminals.

You can use a 10 –30 VDC external supply to power field devices. Connect the external power supply to multiple V and V

SUP

terminals so that the maximum current through any V terminal

is 2 A or less and the maximum current through any V

terminal

SUP

is 1 A or less.

Install a 2 A maximum, fast-acting fuse between the external power supply and the V terminal on each channel. The wiring diagrams in this document show fuses where appropriate.

Table 1 lists the terminal assignments for the signals associated with each channel. The terminal assignments are the same for the FP-TB-x terminal bases and the cFP-CB-x connector blocks.

Table 1. Terminal Assignments

Terminal Numbers

Channel

0 1 2 17 18

1 3 4 19 20

2 5 6 21 22

3 7 8 23 24

4 9 10 25 26

5 11 12 27 28

6 13 14 29 30

7 15 16 31 32

Install a 2 A, fast-acting fuse on each VIN terminal.

Install a 2 A, fast-acting fuse on each IIN terminal.

Install a 2 A maximum, fast-acting fuse on each V

SUP

terminal.

COM

Caution Do not connect both current and voltage inputs

to the same channel.

Caution Cascading power between two modules defeats

isolation between those modules. Cascading power from the network module defeats all isolation between modules in the FieldPoint bank.

FP-AI-110 and cFP-AI-110 4 ni.com

Taking Measurements with the [c]FP-AI-110

The [c]FP-AI-110 has eight single-ended input channels. All eight channels share a common ground reference that is isolated from other modules in the FieldPoint system. Figure 3 shows the analog input circuitry on one channel.

SUP

COM

Filter

16-Bit

Isolated ADC

Figure 3. FP-AI-110 Analog Input Circuit

Measuring Voltage with the [c]FP-AI-110

The input ranges for voltage signals are 0–1 V, 0–5 V, 0–10 V, ±60 mV, ±300 mV, ±1V, ±5 V, and ±10 V.

Figure 4 shows how to connect a voltage source without an external power supply to one channel of the [c]FP-AI-110.

Voltage

Source

SUP

–

COM

To Analog

Input Circuitry

>100 MΩ Input Impedance

To Next Channel

[c]FP-AI-110

Figure 4. Voltage Source without External Power Supply

Figure 5 shows how to connect a voltage source with an external power supply to one channel of the [c]FP-AI-110.

Powered

Voltage

Transducer

OUT

–

1 A

Max

SUP

COM

10–30 VDC

External

Power Supply

(Optional)

To Analog

Input Circuitry

[c]FP-AI-110

–

To Next Channel

2 A

Max

Figure 5. Voltage Source with External Power Supply

Measuring Current with the [c]FP-AI-110

The input ranges for current sources are 0–20, 4–20, and ±20 mA. The module reads current flowing into the I and current flowing out of the terminal as negative. Current flows into the I

terminal, goes through a 100 Ω resistor, and flows out

from the COM or C terminal.

Figure 6 shows how to connect a current source without an external power supply to one channel of the [c]FP-AI-110.

terminal as positive

FP-AI-110 and cFP-AI-110 6 ni.com

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