Monitoring the PLC based industrial control systems through the Internet using Microsoft robotics developer studio technologies

The relative cost of SCADA systems can be substantial if not used in industrial plants. In this paper we present an alternative solution to SCADA systems based on two technologies developed for the Microsoft Robotics Studio, CCR and DSS. Based on these two technologies the services for supporting remote monitoring system are developed and tested. Data acquisition services can rely on PC with direct connection to PLC through RS232, Modbus, CAN or any other protocol. The DDS service can run directly on modern PLC. Thus, the service that presents the data can be on any PC that has an internet connection with service on the PLC, and acquired data can be accessed through the web interface. Considering all of these, we have implemented the industrial monitoring system that uses already available hardware resources, while giving it reliable and secure data transfer over the internet, failure robustness, decentralization, concurrency and scalability.