Product Overview
The Allen-Bradley 1790D-T8BV8B is a CompactBlock LDX base module engineered for decentralized industrial I/O. This 24 Volts DC module delivers 8 universal inputs and 8 sourcing outputs in a compact package, making it an ideal choice for machine builders and system integrators seeking reliable distributed control. With an integrated DeviceNet interface, the 1790D-T8BV8B simplifies wiring and reduces cabinet space, directly supporting your automation architecture.
Technical Specifications
Key parameters of the Allen-Bradley 1790D-T8BV8B module:
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Product Type: Base Module
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Product Line: CompactBlock LDX
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Part Number: 1790D-T8BV8B
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UPC: 612598279203
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Weight: 0.31 lbs (0.14 kg)
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Voltage: 24 Volts DC
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Inputs: 8
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Outputs: 8
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Input Impedance: 4.8 kiloohms
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LED Indicators: Yes
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Communication: DeviceNet
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Field Power: 24 Volts DC
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Isolation Voltage: 1250 Volts RMS
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Output Type: Sourcing
Input Specifications
| Parameter |
Value |
| Inputs per module |
8 points nonisolated, sinking or sourcing |
| On-state voltage |
9.6V dc min, 24V dc nom, 28.8V dc max |
| On-state current |
8 mA max per point @ 28.8V dc |
| Off-state voltage |
5V dc max |
| Input impedance, nom |
4.8 kΩ |
| Indicators |
8 green status |
| Common type |
8 points/8COM (non-polarity) |
Output Specifications
| Parameter |
Value |
| Outputs per module |
8 points nonisolated, sourcing |
| On-state voltage |
10V dc min, 24V dc nom, 28.8V dc max |
| On-state voltage drop |
0.5V dc max |
| On-state current |
1 mA min per channel |
| 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 |
8 green status |
| Output current rating |
0.5 A max per output, 4.0 A max per common |
| Common type |
8 points/8COM (1790D-8BV8B) |
General Specifications
| Parameter |
Value |
| DeviceNet power – supply voltage |
24V dc nom |
| DeviceNet power – voltage range |
11…28.8V dc |
| DeviceNet power – power dissipation |
1.2 W max @ 28.8V dc |
| Field power – supply voltage |
24V dc nom |
| Field power – voltage range |
10…28.8V dc |
| Field power – power dissipation |
6 mA @ 28.8V dc per point |
| Isolation |
I/O to logic: photocoupler isolation; isolation voltage: 1250V ac rms; DeviceNet to logic: nonisolated; DeviceNet power: nonisolated |
| Wiring |
Terminal block (M3.0), screw torque: 7 lb-in max |
Industry Applications
The 1790D-T8BV8B excels in material handling systems where distributed I/O reduces wiring complexity. For example, in a conveyor sorting application, the 8 inputs monitor photo-eyes while the 8 sourcing outputs drive actuator solenoids—all over a single DeviceNet cable. This module also suits packaging machinery, allowing fast setup and reconfiguration during line changeovers. Its 24V DC operation aligns with standard control panels, simplifying power design.
Installation & Setup Guidance
Mount the 1790D-T8BV8B on a standard DIN rail in a clean, dry enclosure. Connect DeviceNet trunk and drop cables to the integrated interface, ensuring proper termination and grounding. Wire field devices to the terminal block using M3.0 screws; tighten to 7 lb-in max to avoid damage. Verify field power is within the 10…28.8V DC range before energizing. After power-up, check the green LED indicators for each channel to confirm correct I/O wiring.
Maintenance & Reliability
Routine inspection of the 1790D-T8BV8B should focus on terminal block tightness, cable integrity, and LED status. Periodically verify that the DeviceNet network remains properly terminated and that no moisture or debris accumulates. Because the module uses photocoupler isolation up to 1250V AC RMS, it tolerates transient voltages well, but always follow safe wiring practices. Proactive checks reduce unplanned downtime and extend service life.
Compatibility & Integration
The 1790D-T8BV8B is designed for DeviceNet networks, making it compatible with Allen-Bradley controllers and scanners that support DeviceNet. Use standard DeviceNet cabling and connectors to integrate with PLCs, HMIs, and other nodes. The module's non-polarity common wiring simplifies field connections, and its sourcing outputs drive most industrial loads directly.
Selection Guide & Purchasing Advice
Before ordering, confirm your system requires 24V DC I/O with DeviceNet communication and that you need exactly 8 inputs and 8 outputs. Verify the output type (sourcing) matches your load requirements. For genuine Allen-Bradley parts and reliable service, PLC Source PRO offers this 1790D-T8BV8B with accurate specifications and fast shipping.