Product Summary
The 1746-NO8V delivers eight single-ended analog voltage outputs for your SLC 500 system. This module offers a ±10.25V DC range with 16-bit resolution for precise control of valves and drives. It provides circuit isolation to protect your chassis and processor.
Expert Technical Evaluation & Performance Review
The Allen-Bradley 1746-NO8V uses a built-in R-2R ladder network for digital-to-analog conversion. This method ensures stable and accurate voltage output across all eight channels.
Each channel delivers a resolution of 16 bits or 320 µV/count. This high resolution allows for fine-grained control of modulating devices like VFDs and dampers. The module achieves an overall accuracy of 0.1% of full scale at 25°C.
At 60°C, the accuracy remains tight at 0.2% of full scale. The maximum overall accuracy drift is just ±33 ppm/°C of full scale. This thermal stability ensures reliable performance in warm control panels.
The output step response is a swift 1 ms from 0 to 95% of full scale. The module updates all eight channels in approximately 5 ms for Class 1 use. This speed supports responsive closed-loop control applications.
The 1746-NO8V supports multiple output voltage ranges for system flexibility. You can select from ±10.25V, ±10V, 0-10V, 0-5V, or 1-5V DC. The output coding spans from -32,768 to +32,767 for proportional counts.
The module consumes 5.6W from the backplane for efficient operation. It draws 120 mA at 5V DC and 160 mA at 24V DC. An optional external 24V DC source can power the module via the J4 jumper.
Deep-Dive Technical FAQ
What load range does the 1746-NO8V support for its outputs?
The module requires a load resistance of 1 kΩ or greater. The maximum load current per output is 10 mA. This ensures compatibility with standard analog input devices.
How does the module behave during a fault condition?
You can configure the fault response to reset, hold last state, or use a preset value. The module also supports output clamping and alarm limits. These features protect downstream equipment during system faults.
What is the operational temperature range for this module?
The 1746-NO8V operates reliably from 0 to 60°C. It also withstands 5-95% non-condensing relative humidity. This range suits typical industrial control environments.
What certifications does the 1746-NO8V hold for hazardous locations?
The module carries CUL and CE certifications for Class I, Division 2 locations. This allows installation in areas with potentially explosive atmospheres. It also has a 30G shock rating and 5G vibration tolerance.
Can I use this module in any SLC 500 chassis slot?
Yes, the module fits any 1746 chassis slot except slot 0. Slot 0 is reserved for the processor. This provides flexibility in system layout and configuration.
Product Procurement & Buyer Guide
The 1746-NO8V solves the pain point of controlling multiple analog devices from one module. It replaces the need for multiple lower-density output cards. This saves valuable chassis space and reduces system cost.
For procurement managers, this module offers a single part number for eight voltage outputs. This simplifies inventory management and reduces stock keeping units. The module's wide output range covers most standard actuator requirements.
Application engineers benefit from the configurable output data parameters. You can set user-defined scale limits, ramp rates, and alarm thresholds. This allows precise tuning of the output signal for each specific device.
The module supports multiple data formats for seamless integration. These include scaled engineering units, PID values, and proportional counts. You can also use the 1746-NO4 format for legacy system compatibility.
The 1746-NO8V includes LED indicators for module and channel status. This simplifies troubleshooting and reduces downtime. The circuit isolation protects the backplane and processor from field wiring faults.
Logistics & Standard Packaging Details
- One Allen-Bradley 1746-NO8V analog output module
- One J4 jumper for power configuration
- One installation and user manual
- One static-safe protective packaging bag
Express delivery shipping is available via FedEx, UPS, and DHL. Contact our sales team for expedited shipping options. We stock this module for immediate shipment.
