The 1790-T8BV8VX belongs to the CompactBlock LDX series. This module combines eight universal inputs with eight sinking outputs. You can use it as a base or expansion block. The inputs support both sinking and sourcing field devices. Meanwhile, the outputs are strictly sinking type. Therefore, this module fits mixed I/O applications perfectly. Its nominal supply voltage is 24V dc. Additionally, the built‑in DeviceNet port simplifies network integration.
Each input accepts 24V dc nominal. The on‑state voltage ranges from 9.6V dc minimum to 28.8V dc maximum. Off‑state voltage must stay below 5V dc. Maximum on‑state current reaches 8 mA per point at 28.8V dc. Nominal input impedance is 4.8 KΩ. All eight inputs share a common arrangement with eight commons (non‑polarity). Eight green LEDs show input status clearly.
The 1790-T8BV8VX provides eight sinking outputs. Output on‑state voltage ranges from 10V dc minimum to 28.8V dc maximum. Nominal voltage is 24V dc. Maximum voltage drop is only 0.5V dc. Each output requires a minimum current of 1 mA to stay on. Off‑state leakage current does not exceed 0.5 mA.
Output current rating is 0.5 A maximum per output. For each common, the total current cannot exceed 4.0 A. Output signal delay from off to on is 0.5 ms maximum. From on to off, the delay goes up to 1.0 ms maximum. Eight green status indicators monitor all outputs. The common type is 8 points per common.
DeviceNet power requires 24V dc nominal. Acceptable voltage range is 11 to 28.8V dc. Maximum power dissipation for the base block is 1.2W at 28.8V dc. Field power also needs 24V dc nominal. Its voltage range runs from 10 to 28.8V dc. Each output point dissipates 6 mA at 28.8V dc.
Isolation between I/O and logic uses photocouplers. Isolation voltage is rated at 1250V ac rms. However, DeviceNet power and logic are non‑isolated. DeviceNet to logic is also non‑isolated. Plan your grounding carefully for noisy environments.
The 1790-T8BV8VX is lightweight at only 0.03 kg. Its compact size saves valuable panel space. Operating altitude limit reaches 2,000 meters above sea level. Use screw mounting for secure attachment. The terminal block accepts M3.0 screws. Maximum torque is 7 lb‑in. Always use copper or copper‑clad aluminum conductors.
Follow these steps to install the 1790-T8BV8VX correctly. First, disconnect all power sources. Next, mount the module using screw mounts. Ensure the panel is grounded properly. Then, connect the DeviceNet cable to the built‑in port. Provide separate field power for the outputs. After wiring inputs and outputs, tighten each screw to 7 lb‑in maximum. Finally, apply DeviceNet power first, then field power.
For expansion systems, you can add multiple 1790-T8BV8VX modules. Each unit communicates via DeviceNet. Therefore, addressing must be unique per module. Additionally, never exceed 0.5A per output channel. Exceeding 4.0A per common may damage the module.
1790-T8BV8VX module (1 unit)
Terminal block (pre‑installed)
Quick reference guide
No certificates or warranty documents included
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1. Can the outputs drive relays or small solenoids?
Yes, each output handles up to 0.5A at 24V dc. This is sufficient for most relays, indicator lights, and small solenoids. For larger loads, use an external contactor.
2. What happens if I connect a sourcing sensor to the outputs?
The outputs are sinking type only. They switch the negative side of the load. Therefore, you must connect the load positive to 24V dc. Sourcing sensors will not work directly with these outputs.
3. Is the 1790-T8BV8VX hot‑swappable?
No, you must disconnect power before removing or inserting the module. Failure to do so may damage the DeviceNet communication or I/O circuits.
4. How do I know if the inputs are wired correctly?
Check the green input status LEDs. When a valid on‑state voltage (above 9.6V dc) is present, the corresponding LED turns on. If the LED stays off, measure the voltage at the terminal.
5. Can I use this module without a DeviceNet scanner?
No, the 1790-T8BV8VX relies on DeviceNet for communication. You need a DeviceNet master or scanner, such as a 1756-DNB or 1784-PCID, to exchange data with a controller.
| Brand Name | Allen-Bradley |
| Model No. | 1790-T8BV8VX |
| Product Type | Input Module |
| hasMerchantReturnPolicy | Adjust according to reality |
| Shippingdetails | Adjust according to reality |
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