1790D-T0B32 32 Sourcing Output Module Allen-Bradley

1790D-T0B32 24V DC Sourcing Output Base Module

Product Introduction

The 1790D-T0B32 is a high-density output module designed for the Allen-Bradley CompactBlock LDX series. It delivers 32 sourcing outputs with a nominal 24V DC supply. Each channel supports up to 0.5A, while the common terminal handles 4.0A maximum. Moreover, the module includes 32 green status indicators for quick visual feedback. You can use it with various field devices like solenoids, indicators, and relays.

Key Technical Specifications

This module operates with a 24V DC nominal field power. Its voltage range spans from 10V DC to 28.8V DC. The on-state voltage drop is only 0.5V DC max, which helps maintain system efficiency. Furthermore, off-state leakage remains below 0.5 mA max, preventing false triggering.

Important output parameters include:

• Minimum on-state current: 1 mA per channel

• Maximum off-state voltage: 28.8V DC

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

The module uses nonisolated outputs with 16 points sharing two commons (16 points/2 COM). Consequently, wiring planning becomes simpler for grouped loads. Photocoupler isolation separates I/O from logic at 1250V AC rms, which enhances system safety.

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 32-point full load draws roughly 192 mA from the field supply.

On-state voltage requirements:

• Minimum: 10V DC

• Nominal: 24V DC

• Maximum: 28.8V DC

Mechanical and Environmental Considerations

The 1790D-T0B32 comes with a terminal block using M3.0 screws. The recommended screw torque is 7 lb-in max. Use only copper or copper-clad aluminum conductors for reliable connections. Additionally, the module fits within standard DIN-rail mounting systems. Its compact form factor saves panel space in industrial cabinets.

Operating temperature ranges from 0°C to 55°C. Storage temperature spans -40°C to 85°C. Relative humidity tolerance is 5% to 95% non-condensing. Thus, the module suits most factory automation environments.

Installation Guidelines

First, ensure that field power and DeviceNet power are turned off. Next, mount the base module securely on a DIN rail. Then, connect the 24V DC field supply to the appropriate terminals. Wire each output channel to its load, respecting the 0.5A per point limit. Finally, tighten all screws to 7 lb-in max.

Remember to group loads per common. Since each common supports 4.0A total, distribute current evenly across channels. For instance, do not exceed 4.0A on any set of 16 outputs. Use proper fusing for each common to prevent damage.

Typical Applications

You will find the 1790D-T0B32 in many automation systems. Specifically, it works well for driving indicator lamps, small relays, and solenoid valves. Additionally, it suits PLC output expansion in packaging lines and assembly stations. Because of its fast response time (0.5 ms On delay), it also fits high-speed sorting applications.

Packaging List

• 1790D-T0B32 module (32-point sourcing output base)

• Terminal block with M3.0 screws

• Product label with serial number

• Quick start guide (printed)

Note: No certificates or warranty documents are included.

Shipping Information

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

Frequently Asked Questions (FAQ)

1. What is the difference between sourcing and sinking outputs?
The 1790D-T0B32 provides sourcing outputs. This means the module supplies current to the load. Sinking outputs, in contrast, receive current from the load.

2. Can I mix different voltage devices on this module?
No, all outputs share a common field power range of 10…28.8V DC. Therefore, you must use devices compatible with the same supply voltage.

3. What happens if I exceed 0.5A on 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 know each output's status?
Each of the 32 channels has a green LED indicator. When the output is on, the LED lights up. This feature simplifies troubleshooting without a multimeter.

5. Is the 1790D-T0B32 compatible with older DeviceNet networks?
Yes, it works with standard DeviceNet scanners. However, verify that your master device supports the CompactBlock LDX series. Also check the baud rate and scan list settings.