Im reading all I can and Im still having a little trouble.
When looking over the logic, I see that only 4 card ( I believe) are being used. The analog output card is in slot 8 of 12. When I look at the rack 13 its listed as "1/2 rack (4 IO Groups). Does this mean the chassis is using a 1/2 slot addressing, or 2 slot addressing ?, or does all the 1 , 2, or 1/2 slot addressing go out the window since Im using a controllogix platform ?
You have to be a bit more explicit.
In Logix5, a "Rack" is not the same thing as a "Chassis".
A Rack is a Logical assignment for 8 I/O Module "Groups", and there a many ways to manipulate your "Racks" into physical "Chassis".
First off, tell us what your physical chassis looks like. Does it have (apart from the slot for the adapter), 4 physical slots, 8 physical slots, 12, or 16 ?.
If, as you said, it has 12 physical slots, then it is a 3/4 chassis, but that does not tell you how that chassis is allocated into the I/O. One way to be certain is to look at the switches on the chassis itself, it's hidden behind the adapter module, and you most definitely should power the chassis down before removing the module to look.
Switches 5 & 6 will tell you the addressing mode for the chassis...
Code:
S5 S6 Mode
OFF ON 1/2-Slot Addressing
ON OFF 1-Slot Addressing
OFF OFF 2-Slot Addressing
Now you've only got room for 8 "addresses" within each logical "rack", so depending on the addressing mode the "slots" could be allocated as follows.....
1/2-slot addressing : Each physical slot has 2 addresses associated with it. In this case you would fill a "rack" allocation with just 4 physical slots, and that would mean your 12-slot chassis is 3 logical "racks", starting at the address specified by the switches on the adapter module.
1-slot addressing : Each physical slot has 1 address associated with it. In this case you would fill a "rack" allocation with 8 physical slots, and that would mean your 12-slot chassis is 1.5 logical "racks", starting at the address specified by the switches on the adapter module.
2-slot addressing : Each physical slot has 1/2 an address associated with it. In this case a "rack" would be 16 physical slots, and that would mean your 12-slot chassis is a 3/4 logical "rack", starting at the address specified by the switches on the adapter module.
Armed with all that information, you should be able to determine the logical address of your analog module. Bear in mind that an analog module requires a full 16-bit interface, so mostly people use 1-slot addressing, so that you don't have to leave empty slots next to it.
All the switch settings, for the adapter and the chassis, are in
here.