What is the USB-4761?
The USB‑4761 is a compact USB data acquisition module that combines 8 relay actuator outputs with 8 optically isolated digital inputs. Designed by Advantech, it provides a convenient way to add reliable digital I/O and switching control to any computer with a USB port. Its 2,500 VDC isolation protection on the input channels makes it ideal for industrial environments where noise, ground loops, or floating potentials are a concern.
Key Specifications and Technical Details
| Feature | Specification |
|---|---|
| Digital Inputs | 8 channels, optically isolated (2,500 VDC) |
| Relay Outputs | 8 channels, form A (SPST-NO) |
| Bus Interface | USB 2.0 (full speed) |
| Power Supply | USB bus‑powered (5 V, 1 A) |
| Input Logic | Wet contact (5–24 VDC) |
| Relay Ratings | 0.5 A @ 120 VAC / 1 A @ 24 VDC |
| Software Support | Drivers for Windows, Linux; example code in C#, VB, etc. |
The module is housed in a rugged metal enclosure and includes LED indicators per channel for quick status verification. It can be easily mounted on a DIN rail or used as a desktop unit.
Use Cases and Applications
The USB‑4761 excels in industrial automation, building management, and laboratory settings where you need to:
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Monitor limit switches, push‑buttons, or sensor alarms with galvanic isolation.
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Control solenoid valves, relays, small motors, or indicator lights.
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Interface with programmable logic controllers (PLCs) or replace a PLC for low‑channel‑count tasks.
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Perform data logging with isolated digital inputs
