SiteManager xx29/xx39 - Working with I/O ports Page 10 of 12
Version 2, April 2013
3.4. High-side Input switching equipment example.
When an output port of the SiteManager is connected to equipment that has
“high-side switching” conductor connections on the input, you must apply
additional circuitry to pull the output towards +.
Be careful about just applying a resistor to pull the output high, as the effect
and resistor value must be calculated based on the power consumption and
switching voltage level of the attached equipment.
A safer setup will be to use a Relay.
The following example uses a 5V relay, which means you can use the Vout
of the SiteManager to pull the output high.
In the following example a 24V relay is used, which means an external
source must keep the level high.
To Next Page
Loading...
