Incrementing Registers RS500

Hello all,
I am trying to collect the lowest temperature in each cycle and then keep that data so I can further study it.

I am using RSLogix 500 to do the logic.

I can gather the lowest temperature, but I can't figure out a nice way to store the data. I am sort of new to ladder logic and I am wondering if there is a way to increment the register that I am moving the data in by one so the data could be stored in the next available slot.

Does anyone know of a way to keep track of this data?

Edit: These temperatures are in the range of 85-115.

In the manual for your CPU search for 'Indirect' addressing

see if the basic idea shown in this post helps ...

http://www.plctalk.net/qanda/showthread.php?p=312635&postcount=2

and here's another that might help visualize how Indirect Addressing works ...

http://www.plctalk.net/qanda/showthread.php?p=91682&postcount=6

Thank you both for the quick response, I found indirect in the manual and will give it some time after lunch.

Here is a forum post from the past that contains a program example showing using two different methods to store data. One uses a FIFO queue and the other uses indirect addressing and a pointer. The application in the example program was for a running average, but it shows how you can use either method to store data.

http://www.plctalk.net/qanda/showpost.php?p=260919&postcount=5

Thank you everyone, after seeing the descriptions posted and reading up on indirect addressing it was a simple fix.

The machine is down right now, so I cant test for 100 percent certainty but addressing like N200:[N200:205] then adding 1 to N200:205 every cycle seems like it should work. (Starting at N200:205 = 207)

Of course I would start at a lower number, but this has to be an online change and that is the biggest register I could find.

Make sure you don't index past the end of N200, if you do you will fault the processor.