The following short list of PLC simulators are available for free download from PLC manufacturers’ sites:
PLCFiddle This is the URL address of the software. Everything will run in the browser. There is no software to download and install. This is ideal for students in school or automation specialists in the field for quick demonstrations or automation training.
PLC LADDER SIMULATOR PLC Ladder Simulator is a simulator for the Android operating system with input and output objects that simulate the I/O ports of a real PLC. You can used PLC Ladder Simulator to create ladder-logic diagrams using components from the standard set used in these diagrams.
Siemens PLC training simulator sample This Siemens PLC simulator bundle is a great tool for learning and development of Siemens PLCs S7-200, S7-300 and S7-400. You can write your STEP7 program in STL, LAD or FBD and then you can simulate it without any additional hardware. It is a complete programming software for S7-PLC with many additional features. Plus with WinSPS-S7 programs can be imported and exported from and to Siemens actual STEP7 software S7 projects! Because we bundle the plant simulator Factory I/O with this Siemens PLC simulation software, you can create a virtual machine for your STEP7 program. With Factory I/O you can simulate your PLC program easily because the sensors of the virtual machines transfer their signal directly to the Siemens PLC simulator. So you don’t have to set the inputs manually.