"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. 

All TRiLOGI versions have built-in Simulator which allows ladder or ladder+BASIC program to be simulated on a PC without purchasing the PLCs. As such the TRiLOGI software is the ideal training tool for learning about PLC programming.