Another example of a distributed system based on the architecture similar to that of an oil pumping station’s control system, is the REGUL Fire and Gas System. This system is used in oil and gas production and in transport and storage facilities to configure fire alarm and fire-extinguishing systems of different types and complexities.

The REGUL Fire and Gas is a flexible system with a variable set of components based on REGUL R500 programmable logic controllers with the support of redundancy and the hot-swapping of modules.

The system is designed to:

  • Detect fire and unauthorized entry in protected areas, including indoor and outdoor installations at a risk of explosion
  • Execute automatic remote control of water-cooling tank units and different types of fire-extinguishing systems including spray, water, foam, gas, powder, etc., both separately and in various combinations
  • Send alarms and alerts to higher-hierarchy equipment such as operator workstations and to adjoining systems such as SCADA, automatic process control systems, central surveillance rooms, etc
  • Control, monitor, and protect technological equipment

System structure

  1. HMI equipment (operator workstation) and a SCADA system supporting Modbus TCP, OPC, and IEC-61870‑5‑104 protocols.
  2. REGUL R500 programmable logic controller. Overall, this level includes:
    • A central control cabinet, based on hot-standby CPU modules
    • Cabinets with I/O racks
    • Network for data transfer between the I/O racks, CPU racks, control center
    • An alarm panel cabinet
  3. Sensors, transducers, alarm announcers, light and sound alert, and actuators


  • Performs self-testing of software and hardware and automatic monitoring of the communication lines (for wired lines for breakdowns and short circuits, for fiberoptic and digital lines – for communication failures)
  • Communication failures are detected on the lines:
    • With equipment that forms starting signal
    • With fire-extinguishing system devices (notifiers, alarm panels, electric valves, explosive cartridges, fire pumps, dosage pumps, fans, electric drives, etc.)

Redundancy and notifications

  • Automatically switches power supply from the main line to backup line and vice versa, with a corresponding indication.
  • There is an option of switching from automatic process control to remote (manual) and back
  • Notifications about fire event, signals of activating fire-extinguishing system and / or of tank water cooling are flexibly programmed as scenarios

Control and monitoring

  • Collects signals from security, fire and security, or fire notifiers. Addressing of the notifiers is done over the RS-485 interface with Modbus RTU protocol by connecting each notifier to a separate input in the system
  • Collects signals from the detection devices and other equipment impacting algorithm of operation (in case it is present in the system)
  • Other equipment could be connected to the system over Ethernet or RS-485 interfaces (process control system, telemechanic devices, etc.)
  • Collects electric signals from sensors monitoring functional state of the equipment (position, pressure, temperature, etc.)


  • Forms control signals for notification, evacuation, smoke and gas removal, etc
  • Priority logging and transmission into external systems notifications on fire, in respect to other signals are formed by the system
  • Controls light and sound alarms
  • Indication of activation of fire extinguishing system and / or tank water cooling, with indication of directions

Access control

  • Prevents unauthorized access to the system
  • Visualization and archiving
  • Displays all the required information, including status of the equipment
  • Forms trend lines for the selected technological parameters
  • Archives selected technological parameters, events, and actions of the operators

Structural Scheme: RTU Redundant Ring-Type Network

.Fire and gas system