Advantech Data Acquisition Modules ADAM 4000 - Manual (Page 80)

Chapter
3
Chapter 3 I/O Modules 3-53
3.14 ADAM-4053 16-channel Digital Input Module
The ADAM-4053 provides 16 digital input channels for dry contact
or wet contact signals. For dry contact, the effective distance from DI
to contact point is up to 500 m.
Figure 3-49 ADAM-4053 16-channel Digital Input Module
Channels: 16 Digital Input
-Dry contact
Logic level 0: Close to GND
Logic level 1: OPEN
-Wet contact
Logic level 0: +2 V max.
Logic level 1: +4 V to +30 V