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Author: search.filters.author.Pongswatd, SawaiSubject: search.filters.subject.Function block

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    PLC FUNCTION BLOCK CREATION FOR MINIMIZING DATA LINK LIMITATION ON CC-LINK-BASED CONVEYOR HANDLING SYSTEM
    (2022-07-01)
    Pongswatd, Sawai
    ;
    Niyomtamarat, Patipak
    ;
    Kummool, Sart
    ;
    Thepmanee, Teerawat
    In order to solve a facing network capacity problem when improving an existing conveyor handling system controlled by programmable logic controllers (PLCs) on master-slave control and communication link (CC-Link) network at a wooden pallet manufacturer, this article presents a software technique for short-term solution. For new requirements to upgrade a pallet sortation to be automated by installing new robotic handling unit, a slave PLC using an interface module modeled FX2N-32CCL (or slave PLC1) cannot receive all specified data of pallet production models from an existing master PLC using intelligent module modeled QJ61BT11N in one communication cycle due to limited data links. To overcome this limitation, a PLC function block creation based on data sorting approach is proposed. Two new function blocks named FB SEND and FB RECEIVE are created based on IEC61131-3 standard for adding to the existing ladder diagrams, which execute on the master PLC central processing unit (CPU) and slave PLC1 CPU, respectively. Experimental results verify that the created function blocks can provide data transfers correctly between the specified sources and destinations. The data received at the slave PLC1 CPU are similar to the data sent from the master PLC CPU. With the proposed solution, the desired conveyor handling system can be upgraded according to user’s requirements.
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    Integration of hart and ff h1 devices into distributed control system for feedforward control in revamping existing plants
    (2019-02-01)
    Thepmanee, Teerawat
    ;
    Julsereewong, Amphawan
    ;
    Pongswatd, Sawai
    To revamp existing process plants that use Highway Addressable Remote Transducer (HART) communication technology, reusing the existing instruments which are still available in the market to combine with new Foundation Fieldbus (FF) H1 instruments in the same control system can become a cost-effective strategy for digital modernization. This paper aims at presenting an engineering method based on IEC 61804 standard for integrating a HART field device and FF H1 devices into a distributed control system (DCS) to operate together in a feedforward control loop. To verify the performance of the proposed method, the feedforward on temperature control configured and handled on the DeltaV DCS is employed as an illustrative case study. Moreover, how different analog-input (AI) function block assignments to the HART and FF transmitters for measuring the controlled variable and disturbance input as well as how different proportional-integral-derivative (PID) function block allocations to the DCS controller and FF field devices affect the H1 segment macrocycle schedules and network traffic loads is also analyzed. Experimental results obtained from some control configuration schemes demonstrate that the combined HART-FF H1 technique can maintain the controlled variable at the setpoint in the presence of disturbances for feedforward control.