This paper deals with the transfer of data by Power-Line Communication (PLC) on a Pulse Width Modulated (PWM) energy network. Target applications concern the adjustable speed drive for industrial infrastructures. In order to implement an efficient communication solution, it is necessary to have a model of the communication channel to determine certain parameters like bandwidth, carrier frequency and modulation formats. The originality of our work is the methodology used to determine the channel model. The first results of simulation and experimental validation are presented in this paper.