Previously, we used the Factory I/O software package to create graphics that represent the machinery that we want control with a PLC program. This lesson will provide you with information on how to simulate the graphics environment with or without the use of the PLC program. Factory I/O allows you to force the equipment status meaning, if your PLC or PLC simulator is not yet attached to the Factory I/O software package, you can still see the operation of the machinery. You will see the force states available for use on the different devices such as conveyors and sensors. You will then learn how to force and remove force those devices. In the previous lesson, we mentioned the distinctive placement and removal objects. We will not need to force these objects as they are forced on by default. Along with demonstrating the usual forces for turning on and off the devices, we will also discuss the force on and off failure states. An on failure is when a piece of equipment has been requested to stop yet it keeps running. Conversely, an off failure is when you have requested a run and the equipment does not start.