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KRAMER: SIMPLE CREATIVE TECHNOLOGY
The Triggers
44
6.8.1 Digital Input
The digital input reads the digital input of an external sensor device that is connected to the GPI/O
port, and can be defined:
• With Pullup: the system can detect either a short circuit (activating the Hi to Lo trigger –
closed circuit) or no short (activating the Lo to Hi trigger – open circuit) using the internal
pull-up resistor. The threshold levels are not relevant in this case and will be automatically
adjusted and locked to their appropriate levels
For example, an alarm closing a circuit that activates a series of actions
• Without Pullup: the system detects the voltage levels and translates them to High or Low
according to the user defined threshold levels.
For example, a high temperature alarm that exceeds the maximum voltage threshold
Setting the Digital Input
In this example, an alarm setting causes a short circuit, thus activating a trigger.
To set the trigger:
1. Define the GPI/O in the port manager.
Check Pullup for short circuit detection; the threshold is set automatically (skip step 2):
Do not check Pullup for voltage level detection; the threshold to be set by the user (proceed to
step 2):
2. Define the GPI/O threshold (minimum from 0 and maximum up to 30V) according to the
indication set by the device
1
.
Figure 87: GPI/O Threshold Window
3. Click the Add GPI/O Trigger (in the Trigger area) and select the GPI/O port (GPI/O 1 or 2 in
this example).
The following window appears:
Figure 88: GPI/O Trigger Properties Window for Digital Input
1
Other voltages will not activate the trigger