Waveshare Industrial 8-Ch Digital Input & Output Module, Modbus RTU, DC 7-36V

Modbus RTU remains one of the most widely deployed protocols in industrial automation, and this module gives a project genuine Modbus-compliant digital input and output across 8 channels, letting it slot directly into an existing Modbus-based control system rather than needing a protocol translator. The wide 7-36V supply tolerance matters in industrial settings where supply voltage isn't always a clean, regulated 5V or 12V - this module stays within spec across that broader range. A solid choice for integrating custom digital I/O into an established industrial control network without stepping outside its existing protocol.