The present invention is directed to triazolopyridinone compounds which are useful as therapeutic agents for the treatment of central nervous system disorders associated with phosphodiesterase 10. The fluid transport chamber includes an valve seat. Behaviors that characterize the operational mode of the vehicle are associated with the actuators. A duty cycle for the switch is calculated based on the signal representative of the difference and a voltage generated by the voltage source. Device level information contains the device specific information that is different from group level information.