NI CFP-AI-100 Analog Input Modules

NI CFP-AI-100 Analog Input Modules

DESCRIPTION

These operating instructions describe how to install and use the FP-AI-100 and cFP-AI-100 analog input modules (referred to inclusively as the [c]FP-AI-100). For information about configuring and accessing the [c]FP-AI-100 over a network, refer to the user manual for the FieldPoint network module you are using.

Features

The [c]FP-AI-100 is a FieldPoint analog input module with the following features:

• Eight analog voltage or current input channels 

• 11 input ranges: 0–1 V, 0–5 V, 0–15 V, 0–30 V, ±1 V, ±5 V, ±15 V, ±30 V, 0–20 mA, 4–20 mA, and ±20 mA 

• 12-bit resolution 

• 250 Vrms CAT II continuous channel-to-ground isolation, verified by 2,300 Vrms,1 minute dielectric withstand test 

• –40 to 70 °C operation • Hot swappable

Installing the FP-AI-100

The FP-AI-100 mounts on a FieldPoint terminal base (FP-TB-x), which provides operating power to the module. Installing the FP-AI-100 onto a powered terminal base does not disrupt the operation of the FieldPoint bank.

To install the FP-AI-100, 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-100). 

2. Align the FP-AI-100 alignment slots with the guide rails on the terminal base. 

3. Press firmly to seat the FP-AI-100 on the terminal base. When the FP-AI-100 is firmly seated, the latch on the terminal base locks it into place.

Installing the cFP-AI-100

The cFP-AI-100 mounts on a Compact FieldPoint backplane (cFP-BP-x), which provides operating power to the module. Installing the cFP-AI-100 onto a powered backplane does not disrupt the operation of the FieldPoint bank.

To install the cFP-AI-100, refer to Figure 2 and complete the following steps:

1. Align the captive screws on the cFP-AI-100 with the holes on the backplane. The alignment keys on the cFP-AI-100 prevent backward insertion. 

2. Press firmly to seat the cFP-AI-100 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 (10 lb ⋅ in.) of torque. The nylon coating on the screws prevents them from loosening.

Input Ranges

To prevent inaccurate readings, choose an input range such that the signal you are measuring does not exceed either end of the range. If a channel is not in use, short the positive input to ground and configure the channel for a bipolar input range. Small fluctuations in floating input signals can cause the red Out of Range status LED on the module to light if the channel is configured for a unipolar range. Similarly, if a channel is configured for 4–25 mA input and the input current is 0 mA, the channel is always out of range.

Overranging

The [c]FP-AI-100 has an overranging feature that measures a little beyond the nominal values of each range. For example, the actual measurement limit of the ±5 V range is ±6.0 V. The overranging feature allows the [c]FP-AI-100 to compensate for field devices with span errors of up to +20% of full scale. Also, with the overranging feature, a noisy signal near full scale does not create rectification errors.

Specifications

Input Characteristics

Number of channels..........................8 

ADC resolution.................................12 bits 

Type of ADC.....................................Successive approximation 

Update rate (all channels) .................360 Hz (2.8 ms)