Create I/Os and connect them to channels
If a drawing in Schematics already has a channel symbol from an I/O card but no I/O has been connected and the desired kind of I/O is not available, you can create a new I/O and then connect it to the channel.
Do the following:
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Right-click on the channel symbol, and select Create a new I/O to this channel.
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When prompted, save the drawing. The I/O properties dialog opens.
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Define the I/O properties.
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Click OK.