A Multi-Floor Elevator Control Based on Oriented-Object Programming by Using Function Block

In this article we have presented a method of object-oriented programming for Siemens S7-1200 PLC to control a multi-floor elevator, using Function Block (FB). The Function Blocks are built based on the behavior of the same functional objects, in which output signals are changed corresponding to input signals in priority. The control method has been implemented with priority control rule for the 4-floor elevator model. Note that, the elevator runs with high stability and ensure all defined functions.