Cairn Energy Interview Questions, Process, and Tips

Foxboro iA series DCS is a distributed control system used in industrial automation.

• It is designed for process automation and control in industries such as oil and gas, power, and chemical.

• It offers advanced control strategies and algorithms for optimizing process performance.

• It includes a range of hardware and software components, including controllers, I/O modules, and engineering tools.

• It supports various communicat...read more

Triconex PLC is a safety instrumented system used in critical applications.

• Triconex PLC is designed for high availability and fault tolerance.

• It uses triple modular redundancy (TMR) architecture to ensure safety and reliability.

• It has a wide range of input/output modules and communication options.

• It is used in industries such as oil and gas, chemical, and power generation.

• It has features such as diagnostics, testing, a...read more

Spanning Tree Protocol (STP) is a network protocol that prevents loops in a network topology.

• STP is used to prevent broadcast storms caused by loops in a network.

• It works by selecting a root bridge and disabling redundant paths to prevent loops.

• STP is implemented in switches and bridges in a network.

• It is defined in IEEE 802.1D standard.

• STP has several variants such as Rapid STP (RSTP) and Multiple STP (MSTP).

DCS systems in different plants are interconnected through various communication protocols.

• DCS systems use communication protocols like Modbus, Profibus, and Ethernet/IP to interconnect.

• Interconnection allows for data sharing and control between different plant areas.

• DCS systems can also be connected to other systems like SCADA and MES for higher-level control and monitoring.

• Interconnection can be achieved through wire...read more

Siemens, GE Fanuc, and Allen Bradley PLCs are programmable logic controllers used in industrial automation.

• Siemens PLCs are known for their high processing speed and advanced communication capabilities.

• GE Fanuc PLCs are known for their flexibility and ability to handle complex applications.

• Allen Bradley PLCs are known for their user-friendly programming software and extensive support network.

• All three PLCs offer a rang...read more

Steps to be taken for work in a safety critical loop

• Identify the safety critical loop

• Define the safety requirements

• Design the loop with redundancy and fault tolerance

• Implement the loop with safety standards

• Test the loop thoroughly

• Maintain the loop regularly