User manual

4 Startup Manual
Dry Contact Support for Digital Input
Each digital input channel accepts either dry contact or
0 ~ 5 VDC wet contact inputs. Dry contact capability
allows the channel to respond to changes in external cir-
cuitry (e.g., the closing of a switch in the external cir-
cuitry) when no voltage is present in the external
circuit. Figure 3-1 shows external circuitry with both
wet and dry contact components, connected as an input
source to one of the card’s digital input channels.
PIN Assignment Connection