Product Overview
The Allen-Bradley 1790D-TN0C2 is a 2-channel analog current output module designed for precise signal control in industrial automation.
Technical Specifications Breakdown
Key parameters for the 1790D-TN0C2 are listed below for quick reference:
| Feature | Specification |
|---|---|
| Output Type | 2 Channel Analog Current Output |
| Output Current Range | 0…20 mA |
| Resolution | 12 bits, 1/4096 max, 4.88 µA/bit |
| Conversion Time | 2 ms/channel |
| Overall Accuracy | 0.2% Full scale @ 0…55 °C |
| DeviceNet Power Supply Voltage | 24V dc nom, range 11-28.8V dc |
| Field Power Supply Voltage | 24V dc nom, range 21.6…26.4V dc (+10%) |
| Power Dissipation (DeviceNet) | 1.2 W max @ 28.8V dc |
| Power Dissipation (Field) | 1.5 W max @ 26.4V dc |
Industry Applications
Process Control in Chemical Plants
In chemical processing, precise current signals control dosing pumps and valve positions. The 0-20 mA output with 0.2% accuracy ensures consistent chemical injection, reducing waste and improving product quality. The module's 2 ms conversion time supports fast loop updates.
Water Treatment Facilities
For water and wastewater treatment, the module drives variable frequency drives (VFDs) and flow control valves. Its nonisolated outputs simplify wiring in grounded systems, while the 600 Ω maximum load resistance accommodates long cable runs typical in large plants.
Packaging Machinery
In packaging lines, the analog outputs regulate servo drives and tension controllers. The 12-bit resolution provides fine granularity for precise motion profiles, enhancing throughput and reducing material waste.
Installation & Setup Guidance
Mount the 1790D-TN0C2 on a DIN rail within the specified environmental range. Use copper or copper-clad aluminum conductors with M3.0 terminal block screws torqued to 7 lb-in maximum. Connect DeviceNet power (24V dc nominal, 11-28.8V dc range) and field power (24V dc nominal, 21.6-26.4V dc range) separately. The module supports up to two discrete expansion modules on the same base. Verify polarity and load resistance (600 Ω max) before energizing.
Maintenance & Reliability
Inspect the module periodically for loose connections and environmental contamination. The module requires no calibration, reducing maintenance overhead. Ensure ambient temperature stays within 0-55 °C for rated accuracy. The photocoupler isolation (1250V ac rms type test) protects logic circuits from field transients.
Compatibility & Integration
This module integrates with DeviceNet networks using standard 24V dc power. It accepts binary data (0000 to 0FFF max scale) and outputs 0-20 mA current. The 2 red/green I/O status indicators simplify diagnostics. Use with compatible Allen-Bradley controllers and scanners for seamless data exchange.
Selection Guide & Purchasing Advice
When selecting the 1790D-TN0C2, confirm your system requires 2-channel analog current output with 0-20 mA range and DeviceNet communication. For applications needing voltage outputs or higher channel counts, consider other modules in the 1790D series. AutoDCSTech stocks this module and offers competitive pricing with fast shipping. Please verify current lifecycle status and availability with AutoDCSTech before ordering.
Troubleshooting & Common Issues
If outputs are stuck at 0 mA, check DeviceNet power (11-28.8V dc) and field power (21.6-26.4V dc) connections. Verify the load resistance does not exceed 600 Ω. If accuracy drifts, confirm ambient temperature is within 0-55 °C. The I/O status LEDs indicate fault conditions: red for error, green for normal operation. For persistent issues, consult the product manual.
Availability & Condition at AutoDCSTech
| Part Number | 1790D-TN0C2 |
|---|---|
| Availability | In Stock |
| Condition | New |
| Warranty | One Year |
| Origin | US |
