JAJSDX8E June 2017 – August 2018 ISO1211 , ISO1212
PRODUCTION DATA.
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The ISO1212 device can be used to create a bidirectional input module that can sink and source current as shown in Figure 29. In this configuration, channel 1 is active if the COM terminal is connected to ground for sinking inputs, and channel 2 is active if the COM terminal is connected to 24 V for sourcing input. The digital input is considered high if either the OUT1 or OUT2 pin is high.
A bidirectional input module can also be built with the ISO121x devices using low-cost Schottky diodes as shown in Figure 30.