Monitoring, recording and logging of plant status and process parameters;
Provision of operator information regarding the plant status and process parameters;
Provision of operator controls to affect changes to the plant status;
Automatic process control and batch/sequence control during start-up, normal operation, shutdown, and disturbance. i.e. control within normal operating limits;
Detection of onset of hazard and automatic hazard termination (i.e. control within safe operating limits), or mitigation;
Prevention of automatic or manual control actions which might initiate a hazard.