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    Integration of Weighing Indicator with Proprietary Commands into PLC-Based System Using Modbus Protocol
    (2017-01-01)
    Chanka, Lerson
    ;
    Smerpitak, Krit
    ;
    Julsereewong, Prasit
    ;
    Julsereewong, Amphawan
    This paper presents a technique to integrate a stand-alone weighing indicator with proprietary commands into a monitoring system of industrial production processes. The proposed technique is based on creating a new function block of the programmable logic controller (PLC) used in weighing machine control for converting weighing indicator commands into the Modbus-RTU commands. Creation of the function block operated in the PLC modeled CP1L-M30DR-D for converting commands of the AD-4401 weighing indicator to display on the Panel Master touch-screen monitor is described as an illustrative case study. Based on the proposed method, weighing data at the field site for local readout can be added into process data monitoring at the human machine interface (HMI) station of the PLC-based system. This enables ease of upgrading the weighing machine used, which has weighing indicator with local readout display. Performance of the proposed system integration is verified by experimental results.
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    Development of redundant bus library for arduino to apply in SCADA system
    (2014-12-16)
    Tipsuwanporn, V.
    ;
    Numsomran, A.
    ;
    Samaimak, S.
    ;
    Harnnarong, Sh
    In this paper, we developed the library for the microcontroller platform Arduino to apply in Modbus SCADA systems. This library allows Arduino board to communicate with RS-485 and use Modbus protocol which transmits data via a redundant bus. Experiments are conducted to compare the stability of data communication between a regular bus and a redundant bus which is the developed library. The results show the developed library Arduino board is able to communicate with redundant buses and more resistant to faults than conventional buses.
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    Software developments for modbus SCADA to extend distance to 2x for controlled devices
    (2013-12-01)
    Tipsuwanporn, V.
    ;
    Numsomran, A.
    ;
    Samaimak, S.
    ;
    Harnnarong, Sh
    Modbus protocol is a protocol that is widely used in SCADA systems. Because it is an open standard protocol. It can be programmed for communications in embedded devices easily. When using the Modbus protocol on RS-485 bus systems, the communication distance is limited to 1.2 km; typically a repeater is used to boost the signal to further the distance. This paper presents an OPC Server and Firmware update to increase the working distance of the control devices. The update is also compatible with existing standard devices as well. © 2013 IEEE.