Technical Survey to develop a DCS.
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A technical survey for a Distributed Control System (DCS/SCD) project consists of a thorough and systematic field audit to gather all the necessary physical, functional, and documentary information about an industrial process. Its objective is to define the scope, avoid surprises during installation, reduce cybersecurity risks, and ensure system reliability.
This process is crucial for the migration, updating, or implementation of control systems in continuous and batch processes.
- Key Components of the DCS Technical Survey.
The survey is divided into several fundamental areas:
- 1. Hardware and Field Inventory (I/O).
- • Signal Identification: Detailed counting and classification of Analog and Digital Inputs/Outputs (I/O), including a percentage of "spare" for future expansions.
- • Instrument Status: Review of existing transmitters, actuators, valves, and sensors, and their compatibility with the new DCS (protocols such as HART, Foundation Fieldbus, Profibus, etc.)
- • Cabinets and Wiring: Evaluation of existing control cabinets, available space, wiring condition, and terminal blocks.
- 2. Network and Communications Architecture.
- • Network Infrastructure: Mapping of the existing control network, including controllers, servers, and operating stations.
- • Integration: Identification of third-party systems (PLCs, drives, substations) that must communicate with the DCS using protocols such as OPC.
- 3. Software, Control and Logic.
- • Control Strategies: Analysis of the current control logic (PID, logical sequences) to migrate or improve.
- • HMI (Human-Machine Interface): Review of the number of screens, alarms, trends and data history.
- • Safety: Safety instrumented systems (SIS) assessment.
- 4. Physical and Operational Infrastructure.
- • Control Room: Available space, environmental conditions (air conditioning, humidity, dust), and ergonomics of the operating consoles.
- • Power and Ground: UPS (Uninterruptible Power Supply) and grounding system review physical/signals.
- 5. Updated Documentation.
- • Review of P&ID drawings (Piping and Instrumentation Diagrams), loop diagrams, single-line diagrams, and process narratives.
- DATA:
To implement a Distributed Control System (DCS), it is crucial to gather a large amount of technical and operational data to ensure that the system meets all the needs of the process.
The following information is detailed, organized by category:
- 1. Process and Plant Information (Initial Basis).
- • Piping and Instrumentation Diagrams (P&IDs): These are the primary source of information, showing all instruments, piping, equipment, and control logic.
- • Description of the Operation Sequence: Step-by-step documentation of how the process works.
- • Control Philosophy: Definition of how the variables will be controlled (PID, advanced control, sequential, batch, continuous).
- • Safety Matrix (Cause and Effect): Crucial for defining emergency shutdown systems (SIS) and process interlock.
- 2. I/O List - The most detailed information.
You must perform an accurate and classified count of the signals that will go to the DCS:
- • Analog Inputs (AI): Temperature, pressure, flow, level sensors (e.g., 4-20mA, HART).
- • Analog Outputs (AO): Valve positioners, frequency converters.
- • Digital Inputs (DI): Motor status (started/stopped), limit switches, alarms.
- • Digital Outputs (DO): Solenoids, motor starting.
- • Intelligent communication points: Protocols such as Foundation Fieldbus, Profibus, Ethernet/IP (for integrating complex devices)
- 3. Hardware and Architecture Requirements.
- • Cabinet location: Physical space, environmental conditions (dust, temperature) and hazardous area classification requirements (ATEX/Hazardous Area).
- • Redundancy: Define which processes are critical and require redundant power supplies, controllers, or networks.
- • Communications: Interfaces with existing PLCs, asset management systems, or other DCS in the plant.
- 4. Human-Machine Interface (HMI) and Operation.
- • Screen Structure: Quantity and type of graphics needed (general screens, area screens, control detail screens).
- • Alarm Philosophy: Definition of priorities (high, medium, low) to avoid operator overload.
- • Reports and Trends: Variables that need to be historical and specific production reports.
- 5. IT and Cybersecurity Requirements.
- • Control Network: Integration with the plant network (OT) and administrative levels (IT).
- • Access and Security: Definition of user profiles (operator, engineer, maintenance) and firewalls.
- Resumen de los primeros pasos:
- 1. P&ID (What you are going to control).
- 2. I/O List (How many signals).
- 3. Control Philosophy(How are you going to control it).
- Additional Requirements:
- List of processes.
- List of procedures.
- List of machinery.
- List of machines.
- List of systems.
- List of departments.
- List of personnel.
- Customer list.
- List of roles.
- List of production lines.
- List of production plans.
- List of main faults.
- List of current problems.
- List of losses.
- List of kpi's main departments.
- If you are not yet convinced about purchasing our product, service, or course, we can conduct a technical assessment at your facility to provide greater clarity and precision regarding the scope of the report we deliver. This assessment costs USD $60,000.00 and will be carried out over two weeks at your location. This fee will be refunded upon purchase of the product, service, or course; otherwise, it will not apply.
- Technical Assessments: Service Description.
- We offer these options to clarify the technologies.
- Courses for:
- Executives.
- Beginners.