a fail - safe drug infusion system , including a user interface controller and at least one pump motor controller , with protocols that enable the pmc to operate therapy delivery for a limited amount of time if the uic fails or the communication link between the uic and the pmc is interrupted . includes synchronization methods to synchronize the delivery information back to the uic after the uic reboots or after the communication link is restored . the pmc may apply intelligent fail - safe drug infusion therapy by temporarily displaying therapy information , for example information normally displayed by the uic , while taking control of alarm signaling and providing minimal user control of the therapy until the uic restores itself , the infusion completes normally , or the user stops the infusion . if the pmc becomes inoperable , the uic may wait for the pmc to reboot , or attempt to switch infusion channels to provide robust drug infusion .