Download VT300 Weighbridge Indicator User's Guide

Setpoints and Digital Input
Technical Specifications
11 Setpoints and Digital Input
The VT300 can interface with weighing automation systems, using two optoisolated
outputs (digital setpoints) and one digital input. Only authorized technicians should
connect the indicator to other systems in your production environment, using these
outputs and inputs.
The outputs (setpoints) are triggered when the scale reads an upper weight
threshold, which you define. There is a separate threshold for each setpoint.
The digital input is used as a tilt switch. When a signal is received on the input
cable, the display locks for a certain period of time. The tilt switch is enabled, and
its time delay defined, during setup.
11.1 Technical Specifications
11.1.1 Digital Outputs
Transistor output open collector positive common.
24VDC + 10% /100mA per output.
Max off: State voltage 30VDC / leakage 100µA.
Optoisolated to 2.5 kV.
Short-circuit protected.
2ms maximum delay for both on and off positions.
11.1.2 Digital Input (Tilt Switch)
9-24 VDC, positive common optoisolated to 2.5 KV.
Input resistance 3.3 KΩ.
2ms maximum delay for both on and off positions.
11.2 Editing Thresholds for Setpoints
Each setpoint has an upper weight threshold that triggers it. For example, if you set a
threshold of 13kg for setpoint 1, nothing will happen as long as the items on the scale
weigh less than 13kg. As soon as an item is placed on the scale that weighs exactly
13kg, or more, the setpoint will be switched to on (if normally off) or to off (if
normally on).
Setpoints can be activated either by net weight value or by gross weight,
depending on how this was defined in setup.
VT300 User’s Guide, Rev. A4
50
Doc # UM-VT300-EN