Communication speed

[rmb550]

I have been using an Allen Bradley Micrologix 1400 and use the Ethernet port for communication. Is there a good way for me to figure out or measure how fast the communication is running at? Specifically, if I am reading or writing a group of registers, how frequently is any given register being transferred?
rmb550

 

[Ken Roach]

I don't know of a way to evaluate this from the controller side.

Usually the data client will have some sort of configuration or diagnostic that gives you a desired "poll rate" or the actual "poll rate". RSLinx Classic, for example, provides that information for OPC groups.

If your data client doesn't have that sort of feature, you're going to have to get out a protocol analyzer. I've done this with Wireshark, because the bytes that correspond to a particular Data Table Register in the SLC-500 addressing format are pretty easy to spot.

 

[rmb550]

Thanks Ken, I was coincidentally looking at Wireshark on the web yesterday.
Will do some more digging into that.
rmb