18
Digital outputs
6 Installation
Instruction book, IQAN- XT2
Connecting loads to digital outputs
Connecting of loads to the digital outputs such as on/off valves is done by using the
DOUT positions and chassis as ground.
Protection against voltage transients
A clamping diode must be placed between the digital output and ground, as close to the
load as possible. This protects the output against high voltage transients.
For example: Use the diode 1N5408 (3A/1000V).
Depending on the load, other clamping diodes might be used instead.
EXAMPLE
Connect the on/off valve to the digital output using the DOUT-A, position 2, and the
chassis as ground.
A clamping diode must be placed as close to the load as possible, see figure below.
Connecting a load to the digital output.
If the load is controlled in parallel with another system, the digital output shall be
protected with a diode.
Digital output protected with a diode.
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