I am currently working on a GE processor system for the first time. I am using a GE 90/30 processor with Versamax I/O on devicenet. The question I have is that we have 1 DeviceNet node (between the devicenet master IC693DNM200 and the Versamax network interface unit (NIU)). We have four racks of I/O. Each rack can have a total of 8 slots (modules) which gives us 128 bits of inputs and 128 bits of outputs. Combined, you can have 8 racks (1 main rack and 7 expansion racks) for a total of 1028 input bits and 1028 output bits. all this is supposedly autoconfigured. My big question is how do we address 4 slots in 4 racks? I am currently using 2 input and 2 output modules per rack. Does the system automatically leave extra I/O for the empty slots in each rack or does the system fill in only what it sees occupied in each rack? In the hardware configuration my ref. address is %I00265 and %Q00145 and both have a length of 1040. I am assuming my first input module is %I00265-%I00280 and my second input module is %I00281-%I00296. What will be the first input number used in the second rack???