Process controls play an important role in how a plant process upset can be controlled and subsequent emergency actions executed. Without adequate and reliable process controls, an unexpected process occurrence cannot be monitored, controlled, and eliminated. Process controls can range from simple manual actions to computer logic controllers, remote from the required action point, with supplemental instrumentation feedback systems. These systems should be designed to minimize the need to activate secondary safety devices. The process principles, margins allowed, reliability, and the means to process control are mechanisms of inherent safety that will influence the risk level at a facility

Automation and control of processing equipment by highly sophisticated computer controls systems is the standard at process facilities Automatic control provides for closer control of the preprocess conditions and therefore increased efficiencies. Increased efficiencies allow higher production outputs. Automation is also thought to reduce operator manpower requirements