IIJ Vol. 1/ No. 1 (2009)

Title: Loop-back Action Latency Performance of an Industrial Data Communication Protocol on a PLC Ethernet Network

Authors: Endra Joelianto and Hosana

Affiliation: Institute Technology of Bandung, Indonesia

Abstract: One of the well known industrial data communication protocols is Modbus which is widely used in industrial automation due to its availability. Modbus protocol can be implemented in many ways according to its network. Network using serial RS485 is well known in industry especially for long range communication, but realtime input/output (I/O) communication over ethernet is fairly new in the industrial environment. There are many questions about the reliability and performance of the Modbus for its optimization especially in its networking. Performance metrics and tests for IT infrastructure equipment have been used for many years, but now with realtime communication being used more, users are asking whether their desktop, laptop, or palm computer can handle the performance requirements of these network intensive applications. These same questions can be asked for industrial equipments as well, such as Programmable Logic Controller (PLC) ethernet networks. In this paper, serial communication RS 485 and TCP/IP are used as physics of Modbus data communication protocol. Action latency performance of this protocol will be tested on the ethernet network. An extension of the ethernet network with serial RS485 network will also be considered in relation with two different network topologies. The algorithm that used to test Modbus is the Media Access Control (MAC) algorithm, which mainly determines the performance of a network.

Keywords: Industrial ethernet networking, Modbus, TCP/IP, MAC, programmable logic controller.

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