Figure 19 Digital Input Voltage Range - Mircom OpenBAS-HV-NX10 Series Installation Manual

Any voltage that lies between 4.1 to 7.9 V can give ambiguous results and must be avoided.
See Figure 19.
Input
Voltage
+12V
10V
8V
6V
4V
2V
0V

Figure 19 Digital input voltage range

The digital inputs can be used as frequency or pulse counters with these specifications:
• Digital inputs 1-2 can measure square wave or pulsed signals
measurable frequency is 250 Hz (15,000 pulses per minute). The minimum pulse width
detectable is 2 milliseconds.
• Digital inputs 3-8 can measure frequencies up to 10 Hz (600 pulses per minute). The
minimum pulse width detectable is 50 milliseconds.
Dry contact, push buttons, magnetic reed switches or PNP transistors must supply voltage to
the digital input for correct operation.
To use the universal inputs as digital inputs
1. Connect the appropriate digital signal to the universal input according to the diagrams in
Table 6.
2. Configure the digital input type using the OpenBAS software.
Table 6 shows how to connect different devices to the digital inputs.
30 (45)
Valid Valid
Uncertain
ZERO ONE
region
region region
Field Wiring
.
The maximum