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I started more than 20 years ago using Simulation software connected to PLCs to "Emulate" a system in real-time and use it to verify the PLC code and electro-mechanical design of automation systems used in the manufacturing industry. Since that time, the term 'Emulation for Logic Validation', also referred to as "Virtual Commissioning", has been to used to differentiate between Simulation and Emulation.
Although a simulation and an Emulation may look to all intents and purposes the same, and may be built largely with the same building blocks or models, there are significant differences in usage and operation.
Simulation models are used to test and develop different solutions in order to arrive at a best solution, based on an accepted set of pre-defined metrics.
Emulation models are not used for experimentation in the same way that simulation models are; they are unsuited to this function as they often execute only in real time.