Changes made for Pathfinder 5226 controllers.

On most hydraulic machines the tank that holds the fluid will have some sort of feature that tells you how much fluid is in the tank. Usually an external gauge that will show the fluid level. This is needed mostly to know if the fluid in the tank is reaching too low of a level. If the fluid is too low and the machine is being run it can damage the pump motor.

Some tanks actually have an internal sensor that can give feedback and allow a system to monitor the level of the fluid. The Hydraulic Oil Level Sensor axis was added to the 5226 controller to do just that. This allows the controller to not turn on the pump or not move another hydraulicly controlled axis if the hydraulic oil level is too low.