HotRIO F-HEE-DIO-24V-8I8O

The datasheet for this board is available here.

The F-HEE-DIO-24V-8I8O is a HotRIO Eurocard expansion module designed for seamless integration with a HotRIO controller board via a Eurocard Type A backplane. It features eight digital input channels and eight digital output channels, each with a fixed direction and dedicated function. All channels support copper signal paths operating within a 12–36 V range (nominally 24 V), making the board well-suited for industrial control applications.

Key features

• 8 digital inputs and 8 digital outputs, each fully isolated

• Supports 12–36 V (nominal 24 V) copper signal interfacing

• Seamless Eurocard backplane integration with HotRIO controllers

• Galvanic isolation using high-speed digital isolators for robust protection

Technical Specifications

Form factor	100x160 mm (Eurocard)
Mounting	Eurocard chassis
Backplane interface	HotRIO Type A
Digital inputs	8 (12–36 V, nominal 24 V, fully isolated)
Digital outputs	8 (12–36 V, nominal 24 V, fully isolated)
Isolation method	High-speed digital isolators
Input/output connector	DB-37 (front panel)
Power supply	5V DC (from backplane)
Power consumption	TBD W

To ensure robust electrical isolation, each input and output channel is fully isolated using high-speed digital isolators. This design enhances safety and reliability by protecting both the controller and connected field devices from transients, ground loops, and electrical noise.

Functionally, the board acts as a transparent signal interface between the front DB-37 connector (field wiring) and the rear backplane connector. The only active components present are for signal conditioning. Signals received from the backplane—originating from the controller board’s FPGA—first pass through a voltage level shifter (converting 1.8 V to 3.3 V), followed by digital isolation.

This architecture provides galvanic isolation between the Eurocard chassis and external field devices, ensuring safe and noise-immune communication across system boundaries.