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Zbornik radova, Elektrotehnički institut "Nikola Tesla"
2016, iss. 26, pp. 1-22
article language: Serbian
document type: Professional Paper
published on: 27/12/2016
doi: 10.5937/zeint26-10604
Creative Commons License 4.0
Protocol converter for serial communication between digital rectifier controllers and a power plant SCADA system
University of Belgrade, Electrical Engineering Institute 'Nikola Tesla'



Energy efficiency Improvement of Hydro and Thermal power plants in EPS by development and implementation of power electronics based regulation and automation equipment (MESTD - 33020)


The paper describes the protocol converter INT-485-MBRTU, developed for serial communication between the thyristor rectifier (based on the proprietary protocol 'INT-CPD-05', according to standard RS-485) and the SCADA system (based on protocol 'Modbus RTU', of the same standard) in the thermal power plant 'Nikola Tesla B1'. Elementary data on industrial communication protocols and communication gateways were provided. The basic technical characteristics of the 'Omron' programmable logic controller CJ series were described, as well as the developed device INT-485-MBRTU. Protocol converters with two versions of communication software were tested, differing only in one control word, intended for a forced successive change of communication sequences, in opposite to automatic sequence relieve. The device iNT-485-MBRTU, with the program for forced successive change of communication sequences, demonstrated the reliability of data transfer of 100 %, in a sample of approximately 480 messages. For nearly the same sample, the same protocol converter, with a version of the program without any type of message identifiers, transferred less than 60 % of the foreseen data. During multiple sixty-hour tests, the reliability of data transfer of at least 99.9979% was recorded, in 100% of the analysed cases, and for a sample of nearly 96,000 pairs of the send and receive messages. We analysed the results and estimated the additional possibilities for application of the INT-485-MBRTU protocol converter.


serial communication; protocol converter; communication gateway; communication protocol; RS-485; Modbus; programmable logic controller (PLC); rectifier


*** (2013) SYSMAC CX Programmer Ver.9: Operation manual. Omron, Uputstvo za upotrebu, Cat. No. W446-E1-17
*** (2015) Industrial automation guide 2015. Omron, Katalog proizvođača
*** (2012) SYSMAC CX Protocol Ver.1.9: Operation manual. Omron, Uputstvo za upotrebu, Cat. No. W344-E1-14
Alves, M., Tovar, E. (2006) Engineering PROFIBUS networks with heterogeneous transmission media. Computer Communications, 30(1): 17-32
Hui, L., Hao, Z., Daogang, P. (2012) Design and Application of Communication Gateway of EPA and MODBUS on Electric Power System. Energy Procedia, 17: 286-292
Janković, M.V., Vukić, V.Đ., Dobričić, S.M., Prole, R.Đ. (2005) Mikroprocesorsko upravljanje tiristorskim ispravljačem za napajanje plazmatrona. Elektroprivreda, vol. 58, br. 3, str. 45-52
Li, W., Zhang, X. (2014) Simulation of the smart grid communications: Challenges, techniques, and future trends. Computers & Electrical Engineering, 40(1): 270-288
Mariño, P., Domı́nguez, M.Á., Poza, F., Vázquez, F. (2004) Using LOTOS in the specification of industrial bus communication protocols. Computer Networks, 45(6): 767-799
O`Driscoll, E., O`Donnell, G.E. (2013) Industrial power and energy metering – a state-of-the-art review. Journal of Cleaner Production, 41: 53-64
SYSMAC CJ (2012) Serial communication boards and serial communication units: Operation manual. Omron, Uputstvo za upotrebu, Cat. No. W336-E1- 11
SYSMAC CS (2009) CJ series programmable controllers: Programming manual. Omron, Uputstvo za upotrebu, Cat. No. W394-E1-14
van Gorp, P. (2009) Advanced remote controls for rectifiers. Metal Finishing, 107(6): 48-50
Vukić, V. (2011) Tiristorski ispravljači sa digitalnim regulatorima zasnovanim na mikrokontroleru 80C196 za sisteme besprekidnog napajanja. Zbornik radova, Elektrotehnički institut 'Nikola Tesla', br. 21, str. 139-155
Vukić, V. (2011) Energetska efikasnost i digitalna komunikacija fazno regulisanih ispravljača za industrijske sisteme besprekidnog napajanja. Poljoprivredna tehnika, vol. 36, br. 3, str. 19-28
Vukić, V.Đ. (2013) Line-frequency phase-controlled rectifiers with adaptive digital controllers. Zbornik radova, Elektrotehnički institut 'Nikola Tesla', br. 23, str. 1-18