Digital Input Input Channels 14 Input Type Sink or Source,Isolated channel with common power or ground Off Voltage Level +1V Max On Voltage Level +4 ~ +30V Input Impedance 3K Ohms, 0.5W Counters channels : 14 Max. Counters : 16-bit (65535)  Max. Input Frequency : 100Hz Min. Pulse Width : 5ms Isolation Voltage 3750Vrms Interface Interface RS-485 Format N, 8, 1 Buad Rate 1200 ~ 115200bps LED Display 1 LED as Power/ Communication indicator 14 LEDs as Digital Input indicators (for i-7041D) Power Input Voltage Range 10 ~ 30VDC Power Consumption 0.2W (i-7041) / 0.9 W (i-7041D) Environment Operating Temperature -25 to 75°C Storage Temperature -40 to 85°C Humidity 5 to 95%, non-condensing