Product Overview
The Allen-Bradley 1790D-8BV8V is a 24V dc 8 universal input/8 sinking output base and expansion module designed for industrial automation systems. It integrates both input and output functions in a single block, reducing wiring complexity and panel space. The module uses DeviceNet power and connects via a 37-pin D-shell connector, making it suitable for distributed control architectures.
Technical Specifications Breakdown
Key parameters for the 1790D-8BV8V are listed below for quick reference:
| Feature | Specification |
|---|---|
| Inputs per block | 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 |
| Outputs per block | 8 points nonisolated, sinking |
| Output current rating | 0.5 A max per output, 4.0 A max per common |
| Supply voltage (DeviceNet power) | 24V dc nom, 11…28.8V dc range |
| Field power voltage range | 10…28.8V dc |
| Isolation I/O to logic | Photocoupler, 1250V ac rms |
| Wiring | 37-pin D-shell connector |
Industry Applications
For example, in packaging lines, the 8 universal inputs can monitor limit switches and photoelectric sensors, while the 8 sinking outputs drive solenoid valves or indicator lights. The nonisolated design suits centralized control cabinets with short wiring runs. In material handling systems, the module’s 0.5 A per output rating handles small DC motors or relays directly, reducing the need for external interposing relays.
Installation & Setup Guidance
Mount the base block on a DIN rail or panel using the provided slots. Connect DeviceNet power to the 24V dc terminals, observing the 11…28.8V dc range. Wire field devices to the 37-pin D-shell connector using a compatible cable. For inputs, use sinking or sourcing wiring per your sensor type. For outputs, ensure each channel does not exceed 0.5 A and total common current stays below 4.0 A. Verify isolation between I/O and logic by testing with a 1250V ac rms megger.
Maintenance & Reliability
Inspect the module periodically for loose connections or damaged wiring. Keep the enclosure free of dust and moisture. The photocoupler isolation provides reliable noise immunity, but verify the 1250V ac rms rating is adequate for your environment. No internal user-serviceable parts exist; replace the module if faults occur.
Compatibility & Integration
The 1790D-8BV8V integrates with Allen-Bradley DeviceNet networks. Use standard DeviceNet configuration tools to set input and output parameters. The nonisolated DeviceNet power simplifies wiring but requires careful grounding to avoid ground loops. The 37-pin D-shell connector is compatible with pre-made cables for quick installation.
Selection Guide & Purchasing Advice
When selecting this module, verify your system voltage matches the 24V dc nominal supply. Consider the total current draw of all outputs to stay within the 4.0 A per common limit. For applications needing higher current or isolation, explore other Allen-Bradley options. AutoDCSTech stocks the 1790D-8BV8V and can advise on availability and lifecycle status. Contact us before ordering to confirm current lifecycle and stock.
Availability & Condition at AutoDCSTech
| Part Number | 1790D-8BV8V |
|---|---|
| Availability | In Stock |
| Condition | New |
| Warranty | One Year |
| Origin | US |
