1790-8BV8VX Sinking Output Base Unit
Product Introduction
The 1790-8BV8VX is a reliable I/O module from Allen-Bradley. It offers 8 universal input points plus 8 sinking output points. This module requires a nominal 24V DC supply. Its nonisolated input design supports both sinking and sourcing wiring. Meanwhile, the outputs are specifically configured as sinking type.
Technical Specifications
Input Specifications
8 input points are nonisolated and nonpolarity.
On-state voltage ranges from 9.6V DC min to 28.8V DC max.
Maximum on-state current is 8 mA per point at 28.8V DC.
Off-state voltage stays below 5V DC max.
Nominal input impedance is 4.8 KΩ.
8 green LEDs clearly indicate input status.
Common type: 8 points share 8COM.
Output Specifications
8 sinking output points are nonisolated.
On-state voltage requires at least 10V DC (24V nom, 28.8V max).
Voltage drop is only 0.5V DC max when activated.
Minimum on-state current is 1 mA per channel.
Off-state leakage remains under 0.5 mA.
Delay from off to on is 0.5 ms max; on to off is 1.0 ms max.
8 green LEDs show each output's status.
Each output handles 0.5 A max, with 4.0 A max per common.
Common type: 8 points share 8 COM.
General & Power Specifications
DeviceNet power is not required on the base block.
Supply voltage is 24V DC nominal (range 11…28.8V DC).
Power dissipation reaches 1.2 W max at 28.8V DC.
Field power needs 24V DC nominal (range 10…28.8V DC).
Field power dissipation is 6 mA per point at 28.8V DC.
Isolation: photocoupler isolation between I/O and logic.
Isolation voltage is 1250V AC rms.
DeviceNet to logic is nonisolated.
DeviceNet power is also nonisolated.
Wiring uses a 37-pin D-shell connector.
Frequently Asked Questions (FAQ)
1. Can the 1790-8BV8VX accept both sinking and sourcing input devices?
Yes, the 8 input points support either sinking or sourcing wiring. The nonpolarity common design makes this possible.
2. What is the difference between this module and the 1790-8BV8BX?
The 1790-8BV8VX has sinking outputs, while the 1790-8BV8BX has sourcing outputs. Choose based on your load wiring needs.
3. Is the 1790-8BV8VX isolated from the DeviceNet network?
No, DeviceNet to logic is nonisolated. However, I/O to logic provides 1250V AC photocoupler isolation.
4. How much current can each sinking output handle continuously?
Each output handles 0.5 A max continuously. The total per common is 4.0 A max.
5. Can I use this module with a 12V DC field power supply?
Yes, the field power range is 10…28.8V DC. 12V DC works, but the nominal is 24V DC for best performance.
