A process control device includes an interface configured to communicate with other devices in a process control system. The process control device also includes a primary power source, the primary power source configured to provide power to at least one component of the process control device, which component, if not powered, would result in disruption to the control of the process. The process control device still further includes a terminal configured to electrically couple the process control device to an auxiliary power source such that the auxiliary power source provides sufficient power to the at least one component when the auxiliary power source is connected to the terminal such that the process control device remains operable to control the process in the absence of the primary power source.

A measurement and control system comprises a housing and an electrical power distribution sub-system. The housing includes a plurality of addressable and programmable modules, a module rack that is expandable and having a length, and a main controller configured to communicate with the plurality of addressable and programmable modules. Each of the addressable and programmable module is installed on the module rack in a sequential configuration and is addressable based on a specific physical location of it across the length of the module rack. The main controller communicates with the plurality of addressable and programmable modules by addressing through a communication network. The electrical power distribution sub-system is configured to monitor inputs and signals from the each addressable and programmable module.

A servomotor controller includes a first and a second converter circuit that perform conversion between AC power of a power supply and DC power, a first inverter circuit that performs conversion between the DC power on the DC side of the first converter circuit and AC power on the side of a first motor, a second inverter circuit that performs conversion between the DC power on the DC side of the second converter circuit and AC power on the side of a second motor, and a power calculation unit that calculates an amount of power of the first motor, wherein control is performed so that the regenerative power of the first motor is supplied to the second motor through the power supply or the regenerative power of the second motor is supplied to the first motor through the power supply, on the basis of the amount of power.

A servomotor controller includes a first and a second converter circuit that perform conversion between AC power of a power supply and DC power, a first inverter circuit that performs conversion between the DC power on the DC side of the first converter circuit and AC power on the side of a first motor, a second inverter circuit that performs conversion between the DC power on the DC side of the second converter circuit and AC power on the side of a second motor, and a power calculation unit that calculates an amount of power of the first motor, wherein control is performed so that the regenerative power of the first motor is supplied to the second motor through the power supply or the regenerative power of the second motor is supplied to the first motor through the power supply, on the basis of the amount of power.