Distributed Control System (DCS), Safeguarding System ( SGS ), Fire & Gas detection system ( FGS ) and Process Control System ( PCS )

A detailed and up to date specification of a Distributed Control System (DCS), Safeguarding System ( SGS ), Fire & Gas detection system ( FGS ) and Process Control System ( PCS ) is very important for your projects. Modifications, claims for extra work and delays in delivery due to missing or not clearly defined requirements need to be avoided. When you are not in the possession of suitable specifications and drawings, Uil Advisors can provide these. Documents detailing these systems can be downloaded immediately from our shop. Instead of repeating generic information in each and every specification, our documents are split-up in multiple individual documents. By doing so, we have ensured that our specifications are to the point and easily accessible. Our documentation refers to International and European standards and laws, For other continents, you will have to adjust the applicable references and specific requirement regarding amounts of equipment, redundancy, flashing & blasting interval and battery back-up duration to suit your requirements

Other documents to support the specifications can be found in the chapter ‘Referenced Documents’. 

The system architecture described is a fully distributed open control system type of system with redundant networks that have a possibility to migrate to other business systems using OPC and Ethernet (TCP/IP) networks as platform. The systems capable of being expanded without interruption of processes already on-line. The system interface available to perform both engineering and operator functions from the same location, having selectable redundancy at the controller level.

The specification describes the following requirements:
  • performance
  • system openness
  • capability for digital bus sysems
  • capability for remote diagnostics
  • capability for asset management
  • reliability
  • availability
  • maintainability
  • single point or single loop effect by failure (dependent upon redundancy dictated by criticality of loop)
  • support of advanced diagnostic and quality assurance goals

Distributed Control System definition

The distributed control system, or DCS, is a system that can be categorized as an Industrial Control System. The main function is to receive real-time data from remote stations and also to send either automated or manual supervisory commands to these field control stations. The field stations then often control valves or breakers and collect data from sensor systems. The DCS serves as a supervisory system in this process, in which they control multiple sub-systems. In order to achieve high automation and work productivity, the DCS works towards maintaining preset values. It is also possible to manually override the DCS when desired. As many of the offshore systems, the DCS is built up in a modular configuration, allowing for an effective implementation on site.

Safeguarding System definition

The Safeguarding System safeguards potential for uncontrolled release of a hazardous gasses, substances and / or situations and is a primary concern for any process operation. The objective of process safeguarding is to identify design features that reduce the likelihood loss of containment and minimize consequences should one occur. Safeguarding can help you avoid designing over-protected processes that shut down too readily and under-protected processes that shut down too late, or worse, not at all. All input and output signals for the SGS & FGS signals shall operate under a fail-safe philosophy with input contacts closed and output devices energized during normal plant operating conditions in complete compliance with the NEN-EN-IEC 61508 SIL level requirements unless indicated otherwise. All software blocks as well as calculation algorithms shall be fully in compliance with SIL 3 requirements and be certified by a notified body.

Fire & Gas detection System definition

The Fire & Gas System including a fire monitoring system described is basically identical to the Safeguarding System described, except that SIL requirement defined are SIL-2.

Process Control System

The process control system described consists of the:
Maintenance PCs
Domain controllers
Information Management System
Office network(s)
KVM extender equipment / racks
Patch panels 

System Layout

The system layout of each of the individual systems described is highly dependable of the amount of :
  • Non-intrinsically safe digital inputs and outputs
  • Intrinsically safe digital inputs and outputs
  • Non-intrinsically safe analogue inputs and outputs
  • Intrinsically safe analogue inputs and outputs
  • Foundation Field bus equipment
  • Data lines and type of data lines
  • System architecture
  • Backup and storage devices
  • Redundancy requirements
  • Graphic displays
  • Work stations
  • Company requirements


Each of the system panels described in the specification consist out of at least the following materials:
  • Dedicated panel for power supply and I/O racks and communication equipment for interface to data network UTP and interface to PLC’s
  • I/O racks, processors & communication equipment, I/O cards
  • System cabling both internal and external between the various nodes
  • 230Vac/24Vdc power supply units
  • Dedicated marshalling panels for termination boards, repeaters / power supply boards and terminals
  • Smart Isolators/multiplexers
  • Foundation Fieldbus terminator blocks (if applicable)
  • Interconnecting cabling and wiring
  • System cables with sockets & plugs
  • Interface cabling

Why would you buy the Uil Advisors Distributed Control System (DCS), Safeguarding System ( SGS ), Fire & Gas detection system ( FGS ) and Process Control System ( PCS ) specification?

The specification provided in our shop is highly detailed. A detailed description of interfaces with several other parts of the complete installation is also explicitly described. The specification refer to multiple reference specifications, which are available in our shop as well. Together with these reference specifications, documents provide clear guidelines to which vendor/manufacturer has to comply. In this particular specification, you will have to specify system requirements such as communication modules, computers, routers, firewalls and other IT-related equipment depending on size and system diversity. The problem with most specifications is that they are far too generic, often resulting in problems and therefore high(er) expenses during the project execution. To prevent this, Uil Advisors Distributed Control System (DCS), Safeguarding System ( SGS ), Fire & Gas detection system ( FGS ) and Process Control System ( PCS ) specification offers a modular build-up, resulting in a completely detailed and customized project design and execution. 

The material choice for your systems can be adjusted in accordance with your company requirements.

Standards / Laws and Regulations

Our specification contains fully detailed description of European standards and laws. For other continents, you will have to adjust the applicable references.

Referenced specifications?

In order to be able to provide complete information for the DCS Distributed Control System (DCS), Safeguarding System ( SGS ), Fire & Gas detection system ( FGS ) and Process Control System ( PCS ) design, reference specifications are detailed below. The reference specifications that apply are the following:
  • PROJ-IN-SP-001
    • Specification for General Instrumentation
  • PROJ-IN-SP-003
    • Specification for fire & gas detectors
  • PROJ-EI-SP-001
    • Electrical & instrumentation panels
  • PROJ-GEN-SP-001
    • General information and requirements
  • PROJ-GEN-LI-010
    • Applicable laws, regulations, codes, standards and authorities

In addition to the above mentioned reference specifications, a set of specific referenced documents and drawings is required to be prepared by client, important to complete the design. These additional reference documents are shown in the specification.