Integrated Control and Safety System, or ICSS is a system that fuses the Process control

Process control

Process control is a statistics and engineering discipline that deals with architectures, mechanisms and algorithms for maintaining the output of a specific process within a desired range...

 and Safety control

Safety

Safety is the state of being "safe" , the condition of being protected against physical, social, spiritual, financial, political, emotional, occupational, psychological, educational or other types or consequences of failure, damage, error, accidents, harm or any other event which could be...

 in an oil/gas facility.

The practice in the oil/gas industry is to separate the Safety System (SIS)

Safety instrumented system

A Safety Instrumented System is a form of process control usually implemented in industrial processes, such as those of a factory or an oil refinery. The SIS performs specified functions to achieve or maintain a safe state of the process when unacceptable or dangerous process conditions are detected...

 from the Process Control System (PCS)

Distributed control system

A distributed control system refers to a control system usually of a manufacturing system, process or any kind of dynamic system, in which the controller elements are not central in location but are distributed throughout the system with each component sub-system controlled by one or more...

. Two independent systems for Process and Safety Systems allows to optimize both safety and process controls. An ICSS integrates these two systems for better communication between the two systems.