The Allen-Bradley 1746-NIO4V SLC 500 Analog Combination I/O Module is installed on the 1746 Chassis and features two user-selectable input channels that can be configured for either current or voltage signals, as well as two voltage output channels.
Input Specifications
Current Inputs: -20 to 20 mA at 250 Ohm impedance with ±0.642% accuracy
Voltage Inputs: -10 to 10 V DC with 1 MΩ input impedance and 305.176 µV resolution
Voltage Input Accuracy: ±0.504% with maximum gain error of ±0.461%
Overvoltage Protection: 220 V AC or DC across input terminals
Output Specifications
Output Type: Voltage outputs using 14-bit R-2R DAC
Output Range: -10 to 10 V with 2 ms response time
Load Capacity: Greater than 1 kΩ with 1 µF load reactance
Output Accuracy: ±0.384% of 10 V full scale with ±54 ppm/°C drift
Isolation: 500 V DC field wiring-to-backplane isolation
System Compatibility & Power
Compatibility: Works with CompactLogix and ControlLogix PACs as distributed I/O
Power Consumption: 55 mA at 5.1 VDC and 145 mA at 24 VDC from backplane
Installation: Single chassis slot with removable terminal block
Recommended Cable: Shielded Belden #8761 cable with 14 AWG size
I'm worried about noise and accuracy. Is it reliable?
It's pretty solid. For voltage inputs, you're looking at a super fine resolution (about 305 µV per step) and accuracy around ±0.5%. If you're running current, it uses Delta-Sigma modulation to keep things tight with 16-bit resolution. Just make sure you use the recommended Belden #8761 shielded wire to keep the signal clean.
What happens if I accidentally wire high voltage to the inputs? Did I just kill it?
You might get lucky. It has overvoltage protection up to 220 V AC or DC on the input terminals. I wouldn't recommend testing your luck, but it's built to survive a mistake.
We're upgrading to ControlLogix. Do I have to scrap this module?
Nope. Even though it's an SLC 500 module (1746 chassis), you can totally use it as distributed I/O for newer CompactLogix or ControlLogix systems. It plays nice with the modern stuff.
The voltage output circuit of the Allen-Bradley 1746-NIO4V makes it easy to get precise analog signals from your SLC 500 system. This module is designed with high-resolution outputs using a 14-bit R-2R DAC, giving you smooth and accurate voltage control from -10 to 10 V. It responds quickly, with a step response of just a couple of milliseconds, and handles loads over 1 kΩ without any problem. While it doesn't have output isolation, it still maintains tight accuracy and low drift, making it a reliable choice for both simple and more demanding applications.
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