funcky941,
May I ask what your trying to accomplish with the analyzer? I see that you want it to troubleshoot and I am wondering if you are evaluating signals that interface the PLC, or perhaps may have need to record other signals as well. I have enjoyed a great amount of success using an eight channel, stand-alone data analyzer to record signals from sensors, pressure transducers, rotary encoders, 4-20mA, PLC I/O, etc., to isolate problems. It works with a laptop and can be purchased with either USB or ethernet. I haven't used an o'scope in 2-1/2 years because this thing is so great.
Grover