Sittigorn, Jirasak

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Sittigorn, Jirasak
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jirasak.si@kmitl.ac.th

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    Item type:Publication,
    AVAILABILITY THROUGH FIELD DEVICE DIAGNOSIS IN FEEDFORWARD CONTROL: A CASE STUDY OF FOUNDATION FIELDBUS-BASED TEMPERATURE CONTROL
    (2022-02-01)
    Kummool, Sart
    ;
    Suwanmanee, Ittimon
    ;
    Weerathaweemas, Songchai
    ;
    Julsereewong, Amphawan
    ;
    Sittigorn, Jirasak
    For endusers, requiring an action to enable a fieldbus-based process control that is not hazardous to continue its operation in the event of transmitter failures, it is essential to understand how diagnostic capability of field instruments is helpful in availability enhancement. In order to effectively implement a feedforward control strategy with increased availability, this article presents a control configuration method when utilizing a Foundation Fieldbus (FF)-based temperature feedforward control as an illustrative case study. Four function block assignment options for configuring the studied control strategy during engineering phase are described. The ‘Uncertain’ measurement status provided by temperature transmitters is treated as ‘Good’ measurement status in all control configuration options for availability goal by reducing process downtime. In addition, based on experimental results, a simplified Petri net model for logical behavior representation of the interested FF-based feedforward is also proposed.
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    Item type:Publication,
    AN OPEN-SOURCE INTRUSION DETECTION AND NOTIFICATION FRAMEWORK FOR OT ATTACKS TARGETING S7-SERIES PLCS
    (2026-06-01)
    Smerpitak, Krit
    ;
    Saleethong, Chayangkun
    ;
    Suphapod, Tanawat
    ;
    Wongkharn, Siripong
    ;
    Julsereewong, Amphawan
    This article presents an open-source intrusion detection and notification (IDN) framework designed to detect attacks targeting Siemens S7-series programmable logic controllers (PLCs) in operational technology (OT) environments. The framework is validated using a simulated weight-based sorting system developed in Factory I/O, with TIA Portal control programs deployed on S7-300, S7-1200, and S7-1500 PLCs. Suricata serves as the core intrusion detection engine, while the Elasticsearch, Logstash, and Kibana (ELK) stack and LINE Notify are integrated to visualize alerts and provide realtime operator notifications. Simulated attacks are carried out using Snap7 to interact with each PLC during live process operations. The experimental results show that the framework reliably detects intrusions across all tested S7 PLC models and delivers timely alerts, demonstrating its effectiveness for real-time monitoring and incident response. In contrast to previous studies that focus primarily on protocol analysis or on individual PLC types, this work offers a practical and scalable intrusion detection solution validated on real hardware and designed to accommodate the coexistence of legacy and modern controllers within OT systems.