Modicon PLC/HMI/SCADA programmer - NEED ASAP
Job Description
Company Description AAAplus Automation is an industrial automation services provider specializing in the design, programming, and integration of control systems for manufacturing and process environments. The company focuses on delivering reliable PLC, HMI, and SCADA solutions that improve productivity, safety, and system performance. Aaaplus Automation works closely with clients to understand operational requirements and implement customized automation strategies. Team members collaborate in a hands-on environment, supporting projects from concept through commissioning and ongoing support.
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Job description:
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At least 5 years Modicon experience required. Please do NOT apply if you are not qualified.
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Project Overview
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AAAPlus Automation is supplying instrumentation and controls for a pump-station disinfection-system improvement project. The selected engineer will help integrate the new equipment and control sequences into the existing Modicon PLC/RTU, local HMI and District SCADA system. This is an operating water/wastewater facility, so the work must be carefully reviewed, documented, tested and coordinated before any field download or cutover.
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Responsibilities
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- Review the contract plans, specifications, existing PLC/HMI/SCADA programs, control-panel drawings, I/O lists and approved equipment submittals.
- Confirm the existing Modicon PLC/RTU model, firmware and programming-software version before making changes.
- Develop and modify PLC logic for the disinfection process and associated equipment.
- Add and map all required analog, digital and communications points.
- Integrate chlorine residual monitoring, ammonia/monochloramine monitoring, level instruments, flow switches, leak-detection devices and related alarms/status points.
- Configure communications with intelligent instruments and local equipment controllers using the required Modbus RTU/RS-485, Modbus TCP or other documented protocols.
- Develop or modify HMI and SCADA screens, alarms, status indications, setpoints, trends and operator controls in accordance with the District’s existing standards.
- Implement operating sequences, permissives, interlocks, alarm handling, equipment shutdown actions and automatic restart requirements shown in the plans and specifications.
- Support offline testing, simulation, I/O verification, FAT/SAT, loop checks, controlled field downloads, startup, commissioning and troubleshooting.
- Coordinate with AAAPlus, HPS Mechanical, electricians, instrument vendors and District personnel.
- Maintain complete backups and provide commented source code, change logs, I/O documentation, alarm lists, test records and final as-built files.
- Avoid unapproved changes to existing operating logic and follow formal backup, review, download and rollback procedures.
- REQUIRED EXPERIENCE
- Strong hands-on experience programming Schneider Electric/Modicon PLCs, preferably M340, M580 or the specific legacy platform used at the site.
- Proficiency with EcoStruxure Control Expert/Unity Pro or the applicable Modicon programming software.
- Demonstrated HMI and SCADA development/integration experience.
- Experience modifying an existing operating PLC/SCADA system, not only developing new standalone machines.
- Strong knowledge of analog and digital I/O, instrumentation, Modbus communications, alarms, permissives, interlocks and process-control sequences.
- Ability to read electrical drawings, P&IDs, control narratives, specifications and I/O lists.
- Experience with controlled commissioning and troubleshooting at an operating industrial facility.
- Ability and willingness to travel to the Murrieta/San Diego area as needed.
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Preferred Experience
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- Water or wastewater treatment, pump stations, chemical-feed or disinfection systems.
- Integration of Hach analyzers/controllers or similar water-quality instruments.
- Public-works documentation, testing, training and commissioning requirements.
- Experience coordinating with municipal operators and existing District SCADA standards.
- Work Location: In person
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