<![CDATA[Hydrant pump systems at PT Wilmar Nabati Indonesia Padang currently employ conventional relay-based controls with limitations in real-time visualization, historical data recording, and remote monitoring capabilities. This research designs a control and monitoring system based on PLC PACSystems RX3i and HMI CIMPLICITY to enhance fire protection system reliability. The Engineering Design Process methodology encompasses system requirement observation, hardware wiring diagram design, and PLC programming using Function Block Diagram and Ladder Diagram according to IEC 61131-3 standard [1]. HMI was designed using CIMPLICITY software featuring real-time monitoring, manual/automatic control modes, alarm and event viewer, and trending displays for pressure, level, and flow data. The system controls four pumps: jockey pump, electric pump, diesel pump, and supply pump, implementing pressure-based pump sequencing and level-based control logic according to NFPA 20 requirements [2]. Laboratory testing employed combined methods of 4-20 mA current injection with Fluke 715 calibrator [3], direct testing with actual devices, and digital signal simulation. Results demonstrate successful pump operation according to setpoints with maximum reading errors of 0.1% for pressure, 0.06% for level, and 0.04% for flow. All control functions for automatic mode, manual mode, alarms, trip reset, and VFD frequency regulation operate according to established requirements.]]>
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