Industry 4.0 often includes wireless communication technologies because of increased number of networked devices. In this master thesis we studied the characteristics of wireless control and simultaneous control of multiple robots. We developed software code for 4 ways of controlling two robots working sequentially or simultaneously, tested the characteristics of loading programs to the robot memory and identified possible solutions for direct physical communication between robots. We designed a model of a production module with two robots for engraving and wrote the software. We measured the times to get information from the robot for two data types over Wi-Fi and over USB cable and compared the results, and measured the delay when the robots are run simultaneously and controlled in different ways. For simultaneous operation of two robots, multi-threaded control is preferred, and reduction of the number of lines in the program code during the start-up of both robots is recommended. Wi-Fi communication increases the latency and variance when accessing robot data compared to USB cable communication, while data type has no significant impact. Direct communication between robots can be used as a safety mechanism in wireless control.
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