Allen-Bradley 1790-8BV8BX 8-Input/8-Output Mixed Module

Allen-Bradley 1790-8BV8BX Mixed 8-Input / 8-Output Module

Input Section Technical Specifications

• Brand & Model: This is a genuine Allen-Bradley component from the 1790 series, specifically the 1790-8BV8BX model.
• Input Type & Count: The module provides 8 universal input points. These points accept both sinking and sourcing field device signals.
• Signal Voltage Levels: An input is recognized as ON at 9.6V DC minimum and OFF below 5V DC, with a nominal 24V DC operation.
• Current Draw & Impedance: Each active input draws a maximum of 8 mA. The typical input impedance is 4.8 kΩ.
• Input Indicators: Eight dedicated green LEDs show the real-time status of each input channel.

Output Section Technical Specifications

• Output Type & Count: The module integrates 8 sourcing output points for driving loads like solenoids or indicators.
• Output Rating: Each output can handle up to 0.5 A. The combined maximum current per common group is 4.0 A.
• Voltage & Performance: Outputs operate from 10V to 28.8V DC with a low 0.5V maximum voltage drop when on.
• Speed & Leakage: Output response is fast with 0.5 ms (Off to On) and 1.0 ms (On to Off) maximum delays. Off-state leakage is a minimal 0.5 mA max.
• Output Indicators: Another set of eight green LEDs provides clear visual confirmation for each output's state.

General Module & Power Specifications

• Power Supplies: The module requires two supplies: 24V DC nominal for DeviceNet logic (11-28.8V range) and a separate 24V DC field power (10-28.8V range) for outputs.
• Isolation: Photocoupler isolation provides 1250V AC RMS protection between the I/O circuits and the internal logic.
• Wiring & Commons: All connections are made via a 37-pin D-shell connector. Both inputs and outputs are individually grouped with one point per common (8 points / 8 COM).
• Power Dissipation: Total module dissipation is under 1.2 W max. Each output point dissipates about 6 mA from the field supply.

Frequently Asked Questions (FAQ)

Q: Can the 8 input points connect to both NPN and PNP sensors?

A: Yes. The 8 universal inputs on the 1790-8BV8BX are designed to work with both sinking (NPN) and sourcing (PNP) 24V DC devices without modification.

Q: What is the maximum load each output can drive?

A: Each of the 8 sourcing outputs can drive a load up to 0.5 Amps. Be sure not to exceed the 4.0 Amp total limit per common group.

Q: Does this module need one or two power supplies?

A: It requires two separate 24V DC supplies: one for the DeviceNet/Logic side and one dedicated to powering the output loads (field power).

Q: What is your return policy if the module doesn't fit my application?

A: We offer a 30-day return policy for items in unused, original condition. Please contact our sales team to arrange a return.

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