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Programable logic controllers' (PLC) State simulator is a device which simulates active operating area (workspace) while testing executive program loaded in PLC's memory. PLC is connected with State simulator we developed and PC compatible computer. After testing and verification of program code accuracy, program implementation in that workspace is possible simply by wire connection to input/output slots on the State simulator and connectors of the external device or process. Main advantages of this State simulator are: output discrete state display in binary and BCD code, analog values measurement from PLC's D/A converter, discrete input state defined in binary and BCD code, analog values defined towards PLC's A/D converter. PLC simulator we developed is to be used in research and testing of program code for applications in automation of plants and processes. We apply this simulator in laboratory exercises at Polytechnic of Zagreb.
PLC ; simulator ; education
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