AutomationDirect DL105 - DC Input Wiring Methods

Installation, Wiring,
and Specifications
2--25
Installation, Wiring, and Specifications
DL105 PLC User Manual, 3rd Edition
DL105 Micro PLCs with DC inputs are particularly
flexible because they can be either sinking or
sourcing. The dual diodes (shown to the right) allow
current to flow in either direction. The inputs accept
either 10 -- 26.4 VDC or 21.6 -- 26.4 VAC. That’s
right, either AC or DC voltages will work. The target
applications are +12 VDC, +24 VDC, and 24 VAC.
You can actually wire part of the inputs as DC
sinking, others as DC s ourcing, and the rest as AC!
PLC DC Input
Input
Common
In the first and simplest example below, all commons are connected together and all
inputs are sinking.
+--
In the next example, the first four inputs are sinking, and the last six are s ourcing.
+--
+
--
+12 VDC
External
Supply
In the last example, four inputs are sinking DC, four are sourcing DC, and two are
AC.
+--
+--
+12VDC
External
Supply
+24 VAC
External
Supply
DC Input Wiring
Methods