Measuring 24 Vdc With The Analog Input; Digital Input; Figure 15 Measuring Vdc - Mircom OpenBAS-LC-NX12R Installation Manual

4.5.4 Measuring 24 VDC with the Analog Input

If you want to measure 24 VDC voltages, add a 15 kΩ ½ Watt 1% resistor in series with the
higher voltage to be measured. See Figure 15.
Field Device
1-30 VDC

Figure 15 Measuring VDC

!
Caution: You can measure up to 30 VDC. A higher voltage will damage the
controller.
Only DC voltages can be input to the universal input. Applying AC
voltages or inverting the polarity can damage the controller.

4.5.5 Digital Input

The universal input can receive digital signals. These are signals that represent only two
states.
When used as a digital input, the universal input has the following ranges:
• ZERO (0) is valid for an input voltage between 0 to 4 VDC
• ONE (1) is valid for an input voltage between 8 to12 VDC
Controller
+
UI1
-
0V
Field wiring
27 (40)