1790D-T0V16 24V DC Sinking Output Base Allen-Bradley

1790D-T0V16 24V DC Sinking Output Base and Expansion Modules

Product Introduction

The 1790D-T0V16 is a sinking output module from the Allen-Bradley CompactBlock LDX family. It offers 16 output points with a nominal 24V DC supply. Each output handles up to 0.5A, while each common supports 4.0A total. Additionally, the module includes 16 green status indicators for real-time monitoring. You can use it as a base or expansion unit in DeviceNet networks.

Key Technical Specifications

This module operates with sinking outputs. That means the output terminal switches the load to DC common. The on-state voltage ranges from 10V DC minimum to 28.8V DC maximum. Nominal voltage is 24V DC. Furthermore, the on-state voltage drop stays below 0.5V DC max, which reduces power loss.

Important output parameters include:

• Minimum on-state current: 1 mA per channel

• Maximum off-state voltage: 28.8V DC

• Off-state leakage current: 0.5 mA max

• Output delay: Off to On in 0.5 ms max, On to Off in 1.0 ms max

The 1790D-T0V16 uses nonisolated outputs with 8 points sharing each common (8 points/2 COM). Consequently, you can group loads efficiently across two commons. Photocoupler isolation separates I/O from logic at 1250V AC rms, which protects the control system from field transients.

Power and Dissipation Details

For base module operation, the DeviceNet power supply requires 24V DC nominal. Its voltage range is 11…28.8V DC. Maximum power dissipation for the base module is 1.2W at 28.8V DC. Meanwhile, field power dissipation equals 6 mA at 28.8V DC per point. Therefore, a 16-point full load draws about 96 mA from the field supply.

On-state voltage requirements:

• Minimum: 10V DC

• Nominal: 24V DC

• Maximum: 28.8V DC

Current ratings to remember:

• Per output: 0.5A max

• Per common (8 points): 4.0A max

Mechanical and Wiring Specifications

The 1790D-T0V16 comes with a terminal block using M3.0 screws. The recommended screw torque is 7 lb-in maximum. Use only copper or copper-clad aluminum conductors for safe and reliable connections. Additionally, the module supports standard DIN-rail mounting. Its compact size saves valuable space inside control cabinets.

Operating temperature ranges from 0°C to 55°C. Storage temperature spans -40°C to 85°C. Humidity tolerance is 5% to 95% non-condensing. Thus, the module fits most industrial automation environments without issue.

Installation Guidelines

First, disconnect all power sources before installation. Next, mount the 1790D-T0V16 securely onto a DIN rail. Then, connect the 24V DC field supply to the appropriate terminals. Wire each sinking output to your load's positive side, since the module switches the negative side. Finally, tighten all terminal screws to 7 lb-in max.

For instance, connect a relay coil between +24V and the output channel. When the output turns on, it completes the path to DC common. Remember to distribute current evenly across each common. Since each common handles only 4.0A, do not exceed this limit on any group of 8 outputs.

Typical Applications

You will find the 1790D-T0V16 in many sinking output applications. Specifically, it works well for driving DC relays, small solenoids, indicator lights, and valve actuators. Additionally, it suits PLC output expansion in conveyor systems, packaging machines, and assembly lines. Because of its fast 0.5 ms response time, it also works in high-speed sorting or pick-and-place equipment.

Difference Between Base and Expansion Use

This model functions as both a base module and an expansion module. As a base module, it connects directly to the DeviceNet network. As an expansion module, it attaches to a base unit to add more sinking outputs. Therefore, you can scale your I/O count flexibly without replacing existing hardware.

Packaging List

• 1790D-T0V16 module (16-point sinking output base/expansion)

• Terminal block with M3.0 screws pre-installed

• Product identification label

• Installation instruction sheet

Note: No certificates or warranty documents are included in the package.

Shipping Information

All orders ship via FedEx, UPS, or DHL. Tracking numbers are sent within 24 hours after dispatch. International delivery typically takes 3–7 business days.

Frequently Asked Questions (FAQ)

1. What does "sinking output" mean for the 1790D-T0V16?
A sinking output switches the load to DC common (0V). The module provides a path to ground. Your load should connect between +24V and the output channel.

2. Can I use the 1790D-T0V16 as an expansion module only?
Yes, it works as both a base and an expansion module. When used as an expansion unit, it connects to a base module like the 1790D-T0B32 to increase sinking output capacity.

3. What happens if I draw 0.6A from one output?
The output may overheat or fail permanently. Additionally, it could damage the common terminal. Always stay within the 0.5A per channel and 4.0A per common limits.

4. How do I check the status of each output channel?
Each of the 16 outputs has a green LED indicator. When the output is actively sinking current, the LED lights up. This feature allows quick visual troubleshooting.

5. Is field power required for the 1790D-T0V16 to operate?
Yes, field power supplies the output circuits. The module needs 10–28.8V DC applied to the field power terminals. DeviceNet power only runs the logic and communication side.