In this paper, we deal with a simple embedded electronic system for an industrial\npneumaticâ??hydraulic system, based on a low-cost programmable logic controller (PLC) and industrial\nelectronic parts with 24 V logic. The developed system is a hydraulic pulse system and generates a\nseries of high-pressure hydraulic pulses with up to a max. 200 bar output pressure level and with\nup to a max. 2 Hz output hydraulic pulses frequency. In this paper we are describing requirements,\nthe concept of the embedded control system in a diagram, security features and its industrial\nnetwork connectivity (CAN bus, MODBUS). In description of the software solution we describe the\nimplementation of the program threads approach in this low-cost PLC. The PLC programming with\nthreads generate two layers of services-physical and application layer, and as a result, the threads\ncreate the main control state machine. In conclusion, we describe the calibration method of the system\nand the calibration curves. For further study we offer readers the full programming code written in\nsequential function charts to be used as PLC language. The cost of the described industrial networked\ncontrol system with industry standard optoelectronic insulated interfaces and certified industrial\nsafety relay does not exceed 1000 Euros.
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