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Control Systems Technician

Effective: 07/01/08
Range G-71
Respirator Class: 3


Perform a variety of skilled tasks in the maintenance of electrical, electronic, pneumatic and mechanical instrumentation; fabricate, install, troubleshoot, repair and maintain instruments; assist in modifications and maintenance of the computer control systems; diagnose and correct telemetry problems in programmable logic controllers software and network hardware; maintain programs and documentation for all programmable logic controller cabinets; assist in managing and maintaining the SCADA system.

Supervision Received and Exercised

  • Receive general supervision from the Senior Control Systems Engineer.
  • Exercise technical supervision over control system modifications made by contractors or District staff.

Examples of Essential Duties

Duties may include, but are not limited to, the following:

  • Determine suitability of new applications and equipment to District uses and needs.  Install new or upgrade existing control system equipment.
  • Diagnose telemetry and field instrument problems including identifying source of problems and implement corrective actions.
  • Integrate new applications and modify computer programs and equipment to optimize plant operations, operator convenience, and off line tasks; design, fabricate, maintain and install electrical and electronic assemblies to enhance computer, telemetry, and instrumentation systems.
  • Assist staff in the use of the District’s computer control and SCADA system; provide guidance in running daily plots, checking control loops, validating telemetry inputs and outputs, and assuring proper computer control system operation.
  • Review and/or create District instrumentation drawings, plans, and specifications for technical content, accuracy, and proper and desirable computer control system interface.
  • Modify and maintain programmable logic computer program files and update for plant and pump station changes.
  • Provide technical supervision, inspection and coordination over control system modifications made by contractors or District staff.
  • Maintain and develop Programmable Logic Controller (PLC) programs and ladder logic to reflect changes in operations and user needs.
  • Work with staff to make process control adjustments.
  • Create Human Machine Interface (HMI) schematics and scripting; train others on system as required.
  • Perform related duties as required.

Minimum Qualifications

Knowledge of:

  • Principles and techniques of repairing and maintaining plant instrumentation.
  • Purpose and operation of instruments.
  • Electrical, electronic and pneumatic theory.
  • Principles and practices of computer programming PLCs.
  • Theory and operation of digital computers, PLCs and plant instrumentation.
  • Mathematics including algebra, statistics, elementary calculus, trigonometry, logarithms, and geometry.
  • Safety hazards and appropriate precautions applicable to work assignments.
  • Principles, practices, and methods related to the design and implementation of large-scale PLC systems and programming, and troubleshooting techniques.
  • PLC network layout and fiber optic and PLC component locations. 

Ability to:

  • Intermittently analyze data reduction from planned tests, identify wiring and microcircuits, interpret schematics, observe changes, problem solve programs, and explain to operators how programs work.
  • Intermittently sit while inputting data entry, bend while reaching for books and tools, crawl around in control room, write or use keyboard to communicate through written means, perform simple and power grasping, pushing, pulling, and fine manipulation, use feet to operate foot controls, and lift or carry weight of 25 pounds or less.
  • Diagnose PLC and computer hardware and software problems and control and instrument problems.
  • Troubleshoot electronic circuits.
  • Design instrument, analog control, and telemetry installations and simple electronic circuits.
  • Perform flow and instrument related calculations.
  • Assist District personnel in the use of the District’s computer system.
  • Establish and maintain cooperative relationships with those contacted in the course of work.
  • Learn and observe all appropriate safety precautions as required by the District including, but not limited to, Cal/OSHA General Industry Safety Orders, the District’s Respiratory Protection Program, and District Safety Directives.
  • Create HMI schematics and scripting.
  • Work shift, on call, weekends, and holidays as assigned.

Experience and Education

Any combination equivalent to experience and education that could likely provide the required knowledge and abilities would be qualifying. A typical way to obtain the knowledge and abilities would be:


  • Four years of experience as an electronic technician or instrument technician, including one year in the maintenance of software and hardware in a process control environment.


  • Equivalent to an Associate of Arts degree or Associate of Science Technology degree with major work in instrumentation, computers, or electronics; or ISA certification as a Control Systems Technician level II.

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