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Abstract -It is very important to test and monitor the operation of Programmable Logic Controller (PLC) in real time (online). Nowadays, conventional, but expensive monitoring systems for PLCs, such as Supervisory Control and Data Acquisition (SCADA) systems, software and hardware simulators (or debuggers), are widely used. This paper proposes a user friendly and cost-effective development environment for monitoring, data acquisition and online simulation of applications with PLC. The purposedoi:10.5937/telfor1401075b fatcat:gzzmjzxv5bdddn7jhp5gyejepu