ETAP seamlessly integrates the analysis of power and control circuits within one electrical analysis program. The Control System Diagram (CSD) simulates the sequence-of-operation of control devices such as solenoids, relays, controlled contacts, multi-sequence contacts, and actuators including inrush conditions. CSD has the capability of determining pickup and dropout voltages, losses, and current flows at any time instance as well as overall marginal and critical alerts. A large library of equipment enables engineers to quickly model and simulate the action of relays associated with control interlocks after given time delays.

Reference: ETAP