US Digital I/O Modules
Digital I/O Modules for Switches, Relays and Counters
Digital I/O modules handle machine control, switch and relay sensing, and counting and timing in industrial automation, transport and defense systems.
The range spans 36 to 96-line GPIO boards with counter/timers, opto-isolated input boards for noisy 24 V environments and Form C relay output boards that switch loads directly, all rated for -40 to +85 °C.
Modules fit PC/104 and Mini PCIe hosts; our guide to the PC/104 bus variants explains which fits which host.
Browse Our Range of Digital I/O Cards
- Power: 5V DC [Bus]
- Temp: -40°C to 85°C [-40°F to 185°F]
- Power: 3.3V DC [Bus]
- Temp: -40°C to 85°C [-40°F to 185°F]
- Certification: RoHS
- Power: 5V DC [Bus]
- Temp: -25°C to 70°C [-13°F to 158°F]
- Certification: RoHS
- Power: 5V DC [Bus]
- Temp: -40°C to 85°C [-40°F to 185°F]
- Certification: RoHS
- Power: 5V DC [Bus]
- Temp: -40°C to 85°C [-40°F to 185°F]
- Power: 5V DC [Bus]
- Temp: -40°C to 85°C [-40°F to 185°F]
- Power: 5V DC [Bus]
- Temp: -40°C to 85°C [-40°F to 185°F]
- Certification: RoHS
Beyond Digital: Data Acquisition and I/O Modules
Analog I/O Modules16-bit analog input and output boards
Serial I/O ModulesRS-232/422/485 modules and cards
CAN Bus I/O ModulesIsolated dual and quad CAN 2.0 modules
Ethernet I/O Modules10/100 and Gigabit network modulesData Acquisition and I/O ModulesThe full range by signal type
Power SuppliesPC/104 DC/DC supplies for the stackWhat to Specify in a Digital I/O Module
A digital I/O module reads switches and sensors and drives relays, lamps and solenoids from an embedded computer. Isolation and output type matter as much as the number of lines.
Channel Count
From 16 lines up to high-density modules. Count inputs and outputs, then allow spares for later changes.
Optical Isolation
Optoisolated inputs protect the computer from field wiring, ground loops and voltage spikes.
Relay Outputs
Form C relay outputs switch external loads directly, without a separate relay board in the enclosure.
Counters and Timers
Counter and timer channels on selected modules measure frequency, count pulses and generate timed outputs.
PC/104 Stacking
PC/104 and PC/104-Plus modules stack on the CPU board, so I/O is added without cabling to another enclosure.
Temperature Range
Modules are rated from -40 to 85 °C, which suits vehicles, rail equipment and outdoor enclosures.
Digital I/O Innovation & Control Insights
Specify Digital I/O for Your Machine.
Tell us the inputs and outputs you need, the voltages involved and the host board. We will recommend the right digital modules, then configure and test the host computer before it ships.