Parker PHD28, Руководство пользователя, Страница: 26 / 157

18 PHD
Inputs
A typical active-high digital input connection is shown below:
Internal to product
Active High
Digital Input
Battery
Application Switch
Figure 8: Active high digital input
3.3.3. PHD50/PHD70 frequency input capabilities
The PHD50 and PHD70 have 2 frequency inputs. These inputs are also
configurable as digital inputs. The frequency inputs are ideal for use with hall-
effect type sensors.
The following table provides specifications for the frequency inputs:
Frequency Input Specifications
Item MIN NOM MAX UNIT
Input range 0 5 32 V
Negative threshold 1.545 V
Positive threshold 4.008 V
Input capacitance at pin 0.1 µF
Over-voltage 36 V
Frequency accuracy 3 %
Frequency range (see note) 0 1500 Hz
Pull-up resistor to min 4.3V, max 5V 1.2
kΩ
Pull-down resistor 26.2
kΩ
Note: Electrically signals to 0 are possible, but the software will limit the minimum
measurable frequency