Parker Vansco User Manual

User Guide 11
Inputs
3.1.1.1. Digital Input Capabilities
The following table provides specifications for the VMM2404’s standard digital
inputs:
Standard Digital Input Capabilities
Item
Min
Nom
Max
Unit
Input voltage range
0
-
32
V
Pull-up / pull-down resistance
3.1 k
-
3.5 k
Ω
Minimum negative going threshold
0.8
-
-
V
Maximum positive going threshold
-
-
1.19
V
Cutoff frequency (hardware)
1
-
12
-
kHz
De-bounce time (software)
2
25
-
50
ms
Overvoltage
-
-
36
V
Wetting current @ 12 V
3.43
-
3.87
mA
Amplifier gain
3
-
1.00
-
V/V
Leakage current sleep mode
- pin @ 12 V
-
-
4.1
mA
3.1.1.2. Digital Input Configuration Options
Digital inputs can be programmed as either active high or active low, and they can
have a pull-up or pull-down resistance of 3.3 kΩ.
 If the input is configured as active high, an internal pull-down resistor will be
used, and the input will be active when it is switched to battery voltage.
 If 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.
3.1.1.3. Active-High Digital Input Connections
A digital input is typically connected to a switch that is either open or closed.
 When an active-high switch is open, the pull-down resistor ensures that no
voltage exists on the input signal, which will be interpreted by the VMM2404
as inactive.
 When the switch is closed, the input is connected to battery voltage, which
will be interpreted by the VMM2404 as active.
1
Assumes there is a zero ohm source impedance from driving source. The actual cutoff in the application will be partially
determined from the source impedance and VMM input capacitance.
2
De-bounce time is based on a sampling rate of 40 Hz.
3
Amplifier gain on digital inputs is only adjustable in "black box" software. It is only pre-set to the value in the table if using
ladder logic.

Parker Vansco Specifications

General

Brand	Parker
Model	Vansco
Category	Control Unit
Language	English