Independent thesis Advanced level (professional degree), 20 credits / 30 HE credits
This report describes an exemple of management systems based on Programmable Logic Controllers. Such systems are designed in order to help monitoring and controlling of a physical system. The system which is controlled in this project is the electrical network of two buildings used by the french parliament. This network consists of several electrical boards where each board is made up of several circuit breakers that protect the electrical equipments and other boards. The goal of the management system is to monitor the network, i.e acquire data about the state of the network, and to control the network, i.e control the position of the breakers (open/closed) according to power supplies availability and network load.
The management system is based on a multiple levels structure.
- Level 0 : is the operating part of the network which is made up of sensors and actuators.
- Level 1 : is the part made up of the Programmable Logic Controllers (PLC). The sensors and actuators of the level 0 are directly connected to the PLC.
- Level 2 : This level enables to acquire the information on a computer and to monitor/control it through an ergonomic graphical interface. Thanks to that level, the operator can keep an eye on the network remotely and control it.
This project consists in programming the Programmable Logic Controllers, and the Human
Machine Interface, according to the specifications of the customer. Only a part of the system has so far been developped since the total duration of the project is about 2 years. The main functions of the PLC program has been programmed, and tested successfully but not in real conditions since the buildings were still under construction. Simulation tools were used in order to test Modbus communication between the levels 0 and 1. The function that controls the breakers according to power supplies availability has been tested as well, by forcing variables in the PLC (to simulate a voltage loss for example).
2007. , 43 p.