Parker Vansco VMM1210, Руководство пользователя

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User Guide 19
Inputs
The following table provides specifications for the multi-purpose inputs when
used as digital inputs:
Digital Input Specifications
Item MIN NOM MAX UNIT
Input voltage range 0 - 32 V
Overvoltage (5 minutes) - - 36 V
Active low pull-up resistance 3.1 3.3 3.5
kΩ
Capacitance at pin - 0.01 - µF
Active low - inactive to active threshold 1.23 - - V
Active low - active to inactive threshold - - 2.60 V
3.3.2.2. Digital Input Configuration
Digital inputs can only be programmed as active low, and they have a pull-up
resistance of 3.3 kΩ.

Since the input is configured as active low, an internal pull-up resistor will be
used, and the input will be active when it is switched to ground.
3.3.2.3. Active-Low Digital Input Connections
An active-low digital input is typically connected to a switch that is either open or
closed.

When the switch is open, the pull-up resistor will ensure no signal exists on
the input pin, which will be interpreted by the VMM1210 as inactive.

When the switch is closed, the input is connected to ground, which will be
interpreted by the VMM1210 as active.
The active-low input must be connected to ground to ensure there is a ground
connection when the state of the input changes.