<![CDATA[Small-scale water-treatment units often rely on manually sequenced pumps, mixers, and chemical dosing, which can cause inconsistent operation and limited process visibility. This study develops and evaluates a laboratory-scale automation system based on an Omron CP1H-XA40DR-A programmable logic controller (PLC) integrated with a Wonderware InTouch supervisory control and data acquisition (SCADA) interface. The main contribution is a low-complexity PLC-SCADA architecture that combines one-button sequential operation with quantitative evaluation of functional logic, HMI response, batch-volume repeatability, and chlorine-dose screening. The system was developed through requirement analysis, electrical and mechanical design, ladder-program implementation, SCADA visualization, fabrication, and experimental testing. Functional testing covered six command-state combinations, HMI response time was measured for seven components, and ten filling cycles were analyzed for water-height and volume consistency. Calcium hypochlorite was screened at calculated masses of 4.44 mg and 13.33 mg for 2 L batches. All six control-state tests were successful. Mean HMI response time was 0.543 ± 0.282 s (0.2-1.0 s). Mean water height and volume were 10.72 ± 0.13 cm and 2.236 ± 0.027 L, with coefficients of variation of 1.23% and 1.22%. At 4.44 mg, all ten samples were reported colorless and without detectable odor or taste; at 13.33 mg, slight chlorine odor and slight bitter taste were each reported in five samples. The prototype demonstrates reliable sequential control and repeatable laboratory-scale filling; however, the water-quality results are only organoleptic screening because residual chlorine, turbidity, pH, and microbiological safety were not measured.]]>
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