1. Standard IDE communication interface.2. 8-channel photoelectric isolation voltage input and 8-channel photoelectric isolation ON/OFF input.3. Working power supply: from DC5V/1A digital I/O control card.4. Isolation voltage: 2,500V rms.5. Wiring terminal for signal input.6. Input voltage 0-24V.7. Indicator light for each channel input.8. Working environment: -25℃ to 70℃, relative humidity