Estudio comparativo de la eficiencia del medio de comunicación alámbrico e inalámbrico del protocolo Modbus implementado en un proceso modular

Abstract

The comparative study of efficiency of Modbus protocol, in a transmission environment (Tx) wired and wireless, by implementing two communicating buses (wireless and RS-485) in a modular process in the Automation Laboratory of Faculty of Mechanics in ESPOCH, with the purpose of providing criteria selection, providing solutions when implementing an industrial network with Modbus. With a deductive method a logic control that works similarly in each environment of Tx was designed. Implementing a wireless network with a Wireless card I/O Modbus and Radio Modem; and a wired network with PLC. A MySQL database was filled storing: length of time processing and miscommunications of each network link. Whit a quantifying valuation of the cost, performance, implementation, security, maintenance and reliability, by an agreement deliberation method was determined that the satisfaction in wireless communication is 84.13%; while wired communication is 85.91%, therefore it is more efficient in a 1.78% than the wireless network. The study allowed us to know that the protocol wired Modbus is more efficient by its performance, security and reliability, very important for the operation of an industrial plant. Recommending the use of wireless communication for monitoring but not for critical control processes.