You add a new pdoentry for 606C to the 1A00 PDO in your ethercat-conf.xml file. In this entry idx, subidx, bitlen, is from the A6 manual, you chose a name for "halPin".
Inside you hal file you can then use that name. E.g. like lcec.0.X.yourname
In this example 0 is your first ethercat interface, X is the name of your slave. See "halshow" -> Pins ...
