1790-T0V16X 16 Output Module 24V DC Sinking Allen-Bradley

Allen-Bradley 1790-T0V16X 16 Sinking Output Module

Product Introduction

The Allen-Bradley 1790-T0V16X delivers 16 sinking DC outputs in a compact base module. This unit operates directly from a 24V DC nominal field power supply. The on-state voltage ranges from 10V DC minimum up to 28.8V DC maximum. Each output channel sinks 0.5A maximum continuously. Moreover, the on-state voltage drop stays below 0.5V DC at full load, which minimizes heat generation. The 1790-T0V16X also offers very fast response times. Turn-on delay measures just 0.5ms maximum, while turn-off delay reaches only 1.0ms maximum. For applications needing many DC outputs with common return grouping, this module provides an excellent solution.

Technical Specifications of the 1790-T0V16X

Output Characteristics

• Number of outputs: 16 points, nonisolated, sinking type.

• On-state voltage: 10V DC min, 24V DC nom, 28.8V DC max.

• On-state voltage drop: 0.5V DC maximum.

• On-state current: 1 mA minimum per channel.

• Off-state voltage: 28.8V DC maximum.

• Off-state leakage: 0.5 mA maximum.

• Output signal delay (Off to On): 0.5 ms maximum.

• Output signal delay (On to Off): 1.0 ms maximum.

• Output current rating: 0.5 A maximum per output, 4.0 A maximum per common.

• Common type: 8 points share 2 COM terminals.

Power Specifications

DeviceNet Power (Base Module)

• Supply voltage: 24V DC nominal.

• Voltage range: 11…28.8V DC.

• Power dissipation: 1.2 W maximum at 28.8V DC.

Field Power

• Supply voltage: 24V DC nominal.

• Voltage range: 10…28.8V DC.

• Power dissipation: 6 mA at 28.8V DC per active point.

Isolation and Wiring

• Isolation (I/O to logic): Photocoupler isolation.

• Isolation voltage: 1250V AC RMS.

• Terminal block: M3.0 screws.

• Screw torque: 7 lb-in maximum.

• Conductor material: Copper or copper-clad aluminum only.

Indicators

• Status LEDs: 16 green indicators, one per output channel.

Mechanical and Environmental Data

This module weighs approximately 1.42 kg (3.13 lbs). The housing protects internal circuits from dust and vibration. Operating temperature ranges from 0°C to 55°C. Storage temperature extends from -40°C to 85°C. Relative humidity can reach 5% to 95% non-condensing. Additionally, the 1790-T0V16X meets standard industrial shock and vibration requirements. You can mount it on a standard DIN rail or directly on a panel. Always position the module away from high-voltage cables and heat sources to ensure reliable operation.

Understanding the Sinking Output Configuration

The 1790-T0V16X uses a sinking output topology. This means the output terminal connects to ground when active. The load connects between the positive supply (+24V DC) and the output terminal. When the output turns on, current flows from the positive supply through the load and into the output terminal to COM. Therefore, this module works perfectly with devices that have one side already connected to +24V DC. Many solenoid valves, relay coils, and indicator lights use this configuration. For instance, if your field devices share a common positive supply, the 1790-T0V16X is the right choice.

Installation Guidelines for the 1790-T0V16X

First, disconnect all power before starting any wiring. Connect the 24V DC positive supply to the load's positive terminal. Then connect the load's negative side to the output channel on the 1790-T0V16X. Finally, connect the module's COM terminals to the negative return of the 24V DC power supply. Because this module uses 8 points sharing only 2 COM terminals, you must plan your wiring carefully. Each COM terminal serves 8 outputs. The maximum current per COM terminal is 4.0A. So if all 8 outputs on one COM group draw 0.5A each, the total becomes 4.0A, which hits the limit exactly. Use copper conductors with appropriate gauge for 0.5A per point. Tighten each M3 screw to exactly 7 lb-in. Over-tightening may strip the threads.

Next, mount the module securely onto a DIN rail. Push the unit until the locking clip engages with an audible click. After wiring completes, apply power and check all 16 green LEDs. Each LED turns on when its corresponding output is active. Finally, verify that the field voltage stays within 10V to 28.8V DC. Lower voltages may not guarantee proper operation due to the 1mA minimum on-state current requirement.

Packaging List for the 1790-T0V16X

• One Allen-Bradley 1790-T0V16X Base Module (16 sinking outputs)

• One product identification label sheet

• One printed quick start guide

• No mounting screws or brackets included

• No communication cables included

Note: This package does not include certificates or warranty documentation. Shipping invoices are separate.

Shipping Information

All orders ship via FedEx, UPS, or DHL depending on your delivery address. Standard transit takes 3-7 business days to major industrial areas. Tracking numbers are emailed within 24 hours after dispatch.

Frequently Asked Questions (FAQ)

1. What is the difference between the 1790-T0B16X and the 1790-T0V16X?
The 1790-T0B16X is a sourcing output module (8 points share 8 COM). The 1790-T0V16X is a sinking output module (8 points share 2 COM). Choose sourcing if your loads connect to COM. Choose sinking if your loads connect to +24V DC.

2. Can I use the 1790-T0V16X with a 12V DC field supply?
Yes, but with caution. The minimum on-state voltage is 10V DC. However, performance at 12V DC meets specifications as long as the load draws at least 1mA per channel. Do not exceed 28.8V DC.

3. Why does the 1790-T0V16X have only 2 COM terminals for 16 outputs?
This module groups 8 outputs per COM terminal. This design reduces wiring for applications where multiple outputs share a common return path. Just remember the 4.0A maximum per COM limit.

4. Is the 1790-T0V16X isolated from the DeviceNet side?
Yes. Photocoupler isolation provides 1250V AC RMS between I/O circuits and the logic side. This isolation protects the controller from field wiring faults.

5. What happens if I exceed 4.0A on one COM terminal?
The internal PCB traces or terminal block may overheat. The 4.0A per COM limit is absolute. For example, do not connect eight 0.5A loads to outputs 0-7 on the same COM group. That would draw exactly 4.0A at the limit. For safety, stay below 3.5A per COM.