Allen-Bradley 1746-NO8V SLC 500 8-Channel High-Resolution Analog Output Module

Product Overview

The Allen-Bradley 1746-NO8V functions as a high-density analog voltage output module for the SLC 500 platform. It provides 8 single-ended output channels, converting digital values into precise bipolar or unipolar voltage signals to drive variable frequency drives (VFDs), valves, and actuators. With 16-bit resolution, this module ensures extreme accuracy in closed-loop control systems. We supply this unit in 100% Brand New condition, providing an original, factory-fresh solution for maintaining or expanding your SLC 500 architecture.

Technical Specifications

• Outputs: 8 Single-ended channels

• Resolution: 16-bit (320 µV/count)

• Output Voltage Ranges: -10 to +10V DC, 0 to 10V DC, 0 to 5V DC, 1 to 5V DC

• Output Coding: -32,768 to +32,767

• Update Time: 540 microseconds for all 8 channels

• Backplane Current (5V DC): 120 mA

• Backplane Current (24V DC): 160 mA (Rack power) or 0 mA (External power)

• Step Response: 2.5 milliseconds (Output)

• Data Formats: Scaled Engineering Units, Scaled for PID, Proportional Counts, User-defined

• Chassis Compatibility: Any 1746 slot except Slot 0

• Weight: 1.00 lbs (0.45 kg)

Engineering Advantages

The 1746-NO8V addresses the precision requirements of modern industrial processes through advanced signal management and hardware flexibility:

• Ultra-Fast Multi-Channel Updates: The module updates all 8 channels in just 540 microseconds. This rapid refresh rate allows the SLC 500 system to control high-speed motion or pressure loops without introducing significant digital-to-analog latency.

• Granular 16-Bit Precision: The 320 µV per count resolution enables exceptionally smooth control of proportional valves and fine-tuning of motor speeds. This precision minimizes mechanical wear on field equipment by eliminating "stepped" signal transitions.

• Flexible Power Management: The J4 jumper allows engineers to select between rack power and an external 24V DC power source. Using external power reduces the thermal load on the chassis power supply, allowing for higher-density I/O configurations in compact enclosures.

• Robust Fault Handling: Integrated software parameters allow users to define specific output behavior during a fault condition. You can program the module to reset, hold the last value, or move to a predefined "safe" preset, ensuring equipment protection during processor or network failures.

FAQs

• Can I use the 1746-NO8V in a remote I/O chassis?

  Yes. The 1746-NO8V installs in any standard 1746 chassis slot (except Slot 0) within a local SLC 500 rack or a remote rack controlled by an ASB or ENT adapter.

• How does the J4 jumper affect my power budget?

  Setting J4 to "EXT" draws 0 mA from the 24V backplane. This configuration requires you to wire an external 24V DC power supply directly to the module, which preserves backplane power for other high-current modules in the rack.

• Is this a Brand New original product?

  Yes. We guarantee this 1746-NO8V is 100% Brand New original stock. For high-precision analog tasks, using new hardware is essential to ensure the 16-bit digital-to-analog converters maintain their factory-rated linearity and accuracy.

• What data format should I use for PID control?

  The module supports a "Scaled for PID" format. This simplifies programming in RSLogix 500 by aligning the output data range directly with the PID instruction’s output variable, eliminating the need for complex manual scaling rungs.