The BNI IOL-302-002-K006 module gives you the ability to use the No. 7 slot in various 
ways. By default, it is used as a digital I/O slot, where both pin 2 and pin 4 can be used as a 
digital input or output. 
This slot can be used as an Extension port by making a corresponding entry in the 
parameter with an index of 55hex. This makes it possible to operate one of the following 
modules using the No. 7 slot. 
BNI IOL-302-002-K006 
BNI IOL-751-V08-K007 
BNI IOL-751-V10-K007 
BNI IOL-751-V13-K007