Triconex 3505E Digital Input Module 24V AC/DCSpecifications for the Model Number 3505E: Model Number: 3505E Type: TMR (Triple Modular Redundancy), Low Threshold Voltage: 24 VDC Points: 32, commoned in groups of 8 AC Range DC Range: 20 42. 5VDC Frequency Range: n a Maximum Voltage: 42. 5 VDC Switching Level: Off to On: > 12 VDC On to Off: < 4 VDC Nominal Turn On: 3 mA to 5 mA Typical Hysteresis: 2 VDC Input Delay: OFF to ON: < 8 ms ON to OFF: < 15 ms Point Isolation: 1,500 VDC Nominal Input