I was just using Panasonic GT21C HMI on a project with Omron PLC.
GT is very nice little HMI that get's the job done. It is meant to be simple to use
and it supports many PLCs. Cable diagrams are in the help file of the software.
Demo software is free for download. It is fully functional, the only limitation compared to full version
is that it allows only 10 screens.
I did call tech support to get the comms running with Omron PLC which was resolved right away.
I've posted note about this in download section:
http://forums.mrplc.com/index.php?autocom=downloads&showfile=769
Few comments:
- basic but nice looking unit
- attractive pricing
- supports many plcs
- simple and easy to use
- driver download is transparent (transferred as part of project download)
- supports partial downloads
- downloads are fast
- bright display
- lightning fast start (instant on)
- built-in buzzer can be controlled by PLC
- project is not single file (it is a folder with each screen saved as separate file) but it is very small (4 screen project was only about 25kb)
- good tech support
panic mode