Patent ID: 7953501

Claim:
A method of diagnosing operation of a process control loop used in a process control or monitor system of an industrial process, comprising: (a) coupling loop interface circuitry in a field mounted loop monitor to the process control loop at a field location of the industrial process. (b) receiving communication data in the field mounted loop monitor from the process control loop, from the communication data transmitted from a field device to a central control room on the industrial process control loop; (c) logging the received communication data in a memory in the field mounted loop monitor; (d) repeating steps (b) and (c); (e) retrieving the logged communication data from the field mounted loop monitor with an external device; and (f) diagnosing operations of the process control loop based upon the logged communication data with the external device whereby the logged communication data is logged within the field mounted loop monitor and subsequently provided to an external diagnostic device.