Two-wire field-mounted process device

A two-wire field-mountable process device comprising:

• a power module couplable to a two-wire loop and adapted to wholly power the process device with power received from the two-wire loop;
• a loop communicator coupled to the power module, and being couplable to the two-wire loop to communicate on the two-wire loop;
• a controller coupled to the loop communicator and power module, and adapted to provide a process variable output based upon at least one process variable;
• a memory module coupled to the power module and the controller, the memory module being adapted to store a user-generated control algorithm relating the at least one process variable to the process output;
• and
• an input channel operably coupled to the controller and the power module and electrically isolated from the controller and the power module, the input channel being adapted to receive at least one sensor input;
• and
• wherein the controller computes the process variable based at least in part upon a sensor signal received through the at least one sensor input and the user-generated control algorithm.

A two-wire field-mountable process device comprising:

• a power module couplable to a two-wire loop and adapted to wholly power the process device with power received from the two-wire loop;
• a loop communicator coupled to the power module, and being couplable to the two-wire loop to communicate on the two-wire loop;
• a controller coupled to the loop communicator and power module, and adapted to provide information relative to at least one process variable;
• a memory module coupled to the power module and the controller, the memory module being adapted to store a user-generated control algorithm;
• and
• an output channel operably coupled to the controller and the power module and electrically isolated from the controller and the power module, the output channel being adapted to provide an output based upon a command signal from the controller;
• and
• wherein the controller provides the command signal to the output channel based upon the information and the user-generated algorithm.

A field-mountable two-wire process device comprising:

• means for wholly powering the process device with power received from a two-wire loop;
• means for communicating over the two-wire loop;
• means for performing input/output;
• and
• means for performing a user-provided control algorithm based at least in part information received from the means for performing input/output.

A method in a field-mountable two-wire process device for providing a process variable, the method comprising:

• wholly powering the process device with a two-wire loop;
• selectively coupling the process device to a first sensor through a first isolated channel to measure a first characteristic of the first sensor;
• selectively coupling the process device to a second sensor through a second isolated channel to measure a second characteristic of the second sensor;
• computing a process variable based on at least one of the first and second measured characteristics;
• and
• providing a process variable output based on the computed process variable.

A method in a field-mountable two-wire process device for providing a process variable, the method comprising:

• wholly powering the process device with a two-wire loop;
• coupling the process device to at least one sensor to measure at least a first characteristic of the sensor;
• computing a process variable output based on operation of an user-generated algorithm and at least the first characteristic;
• and providing the process variable output.