faq04287- ...to 28.8 VDC 20.4 to 26.4 VDC ON voltage 8 V 16 V Input impedance 6.5 kΩ 4.7 kΩ Isolation method ZEN-8E1DR: Not isolated ZEN-8E1DT: Photocoupler Photocoupler Input common ZEN-8E1DR: C...
https://www.ia.omron.com/support/faq/answer/66/faq04287/
faq04288- ... type LED type Communications type AC ZEN-[]C1AR-A-V2 ZEN-[]C2AR-A-V2 ZEN-10C4AR-A-V2 ZEN-8E1AR ZEN-8E1DR ZEN-8E1DT Standard LCD type LED type DC ZEN-[]C1D[]-D-V2 ZEN-[]C2D[]-D-V2 ...
https://www.ia.omron.com/support/faq/answer/66/faq04288/