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This is a ladder or ladder BASIC programming software for the E, H and M-series of PLCs (from Triangle Research International, Inc). The are several versions of the software available for the different PLC series. All TRiLOGI versions have a 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.