TRiLOGI PLC Ladder logic simulator - Free
TriLoGI is a Windows based PLC simulator that is used for educational training and personal use. This PLC Simulator has a built in editor and offline simulator. "TRiLOGI" is the name of the ladder or ladder+BASIC programming software for the E, H and M-series of PLCs. The are several versions of the software available for the different PLC series.
The new Internet TRiLOGI Version 6.2 runs under Windows 95/98/ME, Windows 2000, NT, XP or Vista, making an already highly effective PLC learning tool better than ever!