Visual Modeler is a process simulator that is designed for chemical, petrochemical, refining, and other applications. Plant models can be configured by placing processing units such as distillation towers, reactors, heat exchangers, valves, and pumps as well as instruments such as flow meters, thermometers, and PID controllers on a process flow diagram(PFD). Piping for material flows and lines for transmitting signals can also be represented, connecting these units and instruments. Unlike conventional process simulators, Visual Modeler can show valves, measurement instruments, and controllers as well as an equipment line for operation startup, backup devices in a standalone or a line configuration, and safety equipment. With the resulting plant level model, dynamic and steady state simulations can be carried out.