What software do you have? If 6200, it will NOT do SLC500. There was a 6200 version for PLC5 and a different 6200 version for PLC2. The software for SLC500 was APS. If you don't have APS, you won't do SLC500. Period. End of discussion. You can't use RSLogix5 to program a SLC500 either... Tell us exactly what version of 6200 software you have -- from that we can tell you what it can/can't do.
Now, the next question: Which model of SLC500 do you have?? APS is sooooooo old, that it is very limited on which models of SLC500 can be accessed. I don't remember exactly where it stopped, but it seems like SLC 5/02 or 5/03 may or may not have been supported. Certainly not the 5/04 and 5/05. Period... End of discussion.
If you have APS, what computer do you want to run it on? It will NOT run on XP, not even in DOS compatibility mode. I seriously doubt it will run on 2000. It was a DOS product. You really need a DOS computer to run it right. Seems like I might have had it running on a 95 or 98 box. Possibly an NT box. If you want to have any possibility of using it, you're going to have to have real comm ports... you know, the old IRQ3-type of serial port. Not a virtual port. Not a USB serial adapter.
You asked if you need a KT card. We need to know exactly which model of SLC you have. Yes, it's a 1747. Duh... they all are. Give us the full model number. You can use a KT card to communicate with a SLC 5/04. That's all. You'll need a PIC to communicate with SLC500, 5/01, 5/02, 5/03. Ethernet for SLC5/05. Or you can use serial DF1 to comm to any of them. For us to tell you exactly what you need, you need to tell us exactly what you have.
There are some of us here who actually used that software when it was new! (I've been doing this for 20 years.) Help us to help you... We ~can~ answer your questions if you'll give us the exact information we need to help you.