Product Overview
Meet the Allen-Bradley 1790D-T0B32, a 24V DC 32-point sourcing output base module engineered for demanding industrial control systems. This compact module delivers reliable discrete output control with 32 nonisolated sourcing outputs, making it an ideal choice for controlling solenoids, contactors, and indicator lamps in manufacturing and process automation.
With a nominal supply voltage of 24V DC and a robust output current rating of 0.5A per output (4.0A per common), the 1790D-T0B32 handles moderate loads with ease. Its photocoupler isolation protects logic circuits from field transients, enhancing system reliability.
Technical Specifications
| Parameter |
Value |
| Outputs per module |
32 points, nonisolated, sourcing |
| On-state voltage |
10V DC min, 24V DC nominal, 28.8V DC max |
| On-state voltage drop |
0.5V DC max |
| On-state current |
1 mA min per channel |
| Off-state voltage |
28.8V DC max |
| Off-state leakage |
0.5 mA max |
| Output signal delay |
Off to On: 0.5 ms max; On to Off: 1.0 ms max |
| Indicators |
32 green status LEDs |
| Output current rating |
0.5A max per output; 4.0A max per common |
| Common type |
16 points/2 COM |
| DeviceNet power supply voltage |
24V DC nominal; range 11–28.8V DC |
| DeviceNet power dissipation |
1.2W max @ 28.8V DC |
| Field power supply voltage |
24V DC nominal; range 10–28.8V DC |
| Field power dissipation |
6 mA @ 28.8V DC per point |
| Isolation |
I/O to logic: photocoupler isolation; 1250V AC rms |
| Wiring |
Terminal block (M3.0); screw torque 7 lb-in max (copper or copper-clad aluminum conductors) |
Key Features & Benefits
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32 sourcing outputs provide flexible control for a wide range of field devices.
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Fast signal response with off-to-on delay of 0.5 ms and on-to-off delay of 1.0 ms ensures timely actuation.
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Photocoupler isolation protects the logic side from electrical noise and transients, improving system stability.
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Green status indicators for each output simplify troubleshooting and reduce downtime.
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Wide supply voltage range (10–28.8V DC) accommodates various power sources.
Industrial Applications
The 1790D-T0B32 excels in applications requiring reliable discrete output control. In a packaging line, it can drive pneumatic solenoid valves to control cylinder movements, ensuring precise product handling. In a material handling system, the module activates conveyor motors and warning beacons, coordinating material flow. In HVAC control panels, it switches contactor coils for fans and pumps, maintaining environmental conditions.
Its 4.0A per common rating supports multiple outputs simultaneously, making it suitable for clustered loads. The module's compact design saves panel space, and the terminal block wiring simplifies installation.
Installation & Setup
Mount the 1790D-T0B32 on a standard DIN rail or panel. Use copper or copper-clad aluminum conductors and tighten terminal screws to a maximum torque of 7 lb-in to ensure secure connections. Connect the DeviceNet power supply (24V DC nominal) and the field power supply (24V DC nominal) as per the wiring diagram. Verify that the supply voltage stays within the specified ranges to avoid damage.
After wiring, power up the module and check the green status LEDs. Each LED corresponds to an output channel; a lit LED indicates an active output. Ensure that the total current draw from each common does not exceed 4.0A.
Maintenance & Reliability
Regularly inspect the terminal connections for tightness and signs of corrosion. Clean the module enclosure with a dry cloth to prevent dust accumulation. Periodically verify the output operation by cycling each channel and observing the status LEDs. The photocoupler isolation reduces wear on internal components, contributing to long service life. By following these simple maintenance steps, you minimize unexpected failures and extend the module's operational lifespan, reducing total cost of ownership.
Compatibility & Integration
The 1790D-T0B32 is part of the Allen-Bradley Compact 5000 I/O family and integrates seamlessly with ControlLogix and CompactLogix controllers via the DeviceNet network. It supports standard I/O mapping and can be configured using RsLogix 5000 or Studio 5000 software. The module is also compatible with other DeviceNet scanners, allowing flexible system design.
Buying Guide
Before purchasing the Allen-Bradley 1790D-T0B32, verify your system's power requirements and output load characteristics. Ensure the DeviceNet network is properly terminated and that the module's power dissipation does not exceed your cabinet's thermal capacity. For additional support or to place an order, PLC Source PRO offers genuine parts with fast shipping and competitive pricing.