Product Overview
The Allen-Bradley 1790-8BV8VX is a compact industrial automation module that combines 8 universal inputs and 8 sinking outputs in a single base unit. Designed for 24V DC control systems, this module delivers reliable signal acquisition and actuator control in a space-saving form factor. With its nonisolated design and photocoupler isolation, the 1790-8BV8VX ensures dependable performance across diverse industrial applications.
Engineered for flexibility, the 1790-8BV8VX accepts both sinking and sourcing input signals, making it easy to integrate with a wide range of sensors and switches. The outputs provide up to 0.5A per channel, sufficient for driving small solenoids, relays, and indicator lamps. This module is an excellent choice for OEMs and end-users seeking a cost-effective, high-density I/O solution.
Key Technical Specifications
The following specifications are directly from the manufacturer's data and ensure accurate system design:
| Parameter |
Value |
| 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 |
| Off-state voltage |
5V DC max |
| Input impedance (nom) |
4.8 KΩ |
| Outputs per block |
8 points nonisolated, sinking |
| Output on-state voltage |
10V DC min, 24V DC nom, 28.8V DC max |
| Output current rating |
0.5 A max per output, 4.0 A max per common |
| Output signal delay |
Off to On: 0.5 ms max, On to Off: 1.0 ms max |
| Isolation voltage |
1250V AC rms (I/O to logic) |
| DeviceNet power supply |
24V DC nom, 11…28.8V DC range |
| Field power supply |
24V DC nom, 10…28.8V DC range |
| Wiring |
37-pin D-shell connector |
Real-World Applications
The 1790-8BV8VX excels in material handling systems where it monitors limit switches and proximity sensors while controlling conveyor start/stop logic. Its fast response times and high output current make it ideal for packaging machinery that requires precise actuation of pneumatic valves and small motors.
In automated assembly lines, this module manages tooling clamps and part-present sensors, ensuring consistent production quality. The module's nonpolarity input common simplifies wiring, reducing installation errors and maintenance time.
Installation & Setup Guidance
Mount the 1790-8BV8VX on a standard DIN rail in a clean, dry enclosure. Connect field wiring using the 37-pin D-shell connector; ensure proper strain relief to prevent accidental disconnection. For inputs, use shielded cables if running near high-voltage lines. For outputs, verify that each channel's load current does not exceed 0.5A and that the total common current stays under 4.0A. Apply 24V DC to both the DeviceNet and field power terminals, respecting the specified voltage ranges.
Maintenance & Reliability
Periodically inspect the module for dust accumulation and loose connections. Check the green status LEDs to confirm normal operation; an unlit LED may indicate a wiring issue or a failed sensor. The module's photocoupler isolation protects the logic side from field transients, reducing downtime. With no moving parts, the 1790-8BV8VX requires minimal maintenance, contributing to lower total cost of ownership.
Compatibility & Integration
This module is designed for use with Allen-Bradley DeviceNet networks, allowing seamless integration into existing ControlLogix, CompactLogix, or SLC 500 systems via a DeviceNet scanner. It supports both sinking and sourcing inputs, making it compatible with a broad range of sensors. The nonisolated DeviceNet power simplifies wiring, but ensure your network power supply is sized correctly.
Selection Guide & Purchasing Advice
Before purchasing, verify your system's voltage requirements and I/O count. The 1790-8BV8VX requires a 24V DC field supply and a DeviceNet network connection. Confirm that your controller supports DeviceNet communication. For technical support or to place an order, trust PLC Source PRO for genuine Allen-Bradley parts and fast delivery.