The HIM HART Loop Monitor now has the ability to confirm that the Fisher(r) FIELDVUE® DVC6000 Series Digital Valve Controller is performing a partial valve stroke test to validate proper Emergency Shutdown (ESD) valve operation and, if the test has failed, to alert the user that the ESD valve is stuck. Partial valve stroke testing is an alternative to periodically testing critical ESD valves without completely stroking them, which normally means a disruptive process shutdown. As part of its unique HART diagnostic data, the DVC6000 Digital Valve Controller sends digital information on the HART loop when a partial valve stroke test is in progress and if the ESD valve is stuck. Mounted transparently on the HART loop, the HIM continuously monitors the HART data from the DVC6000. When a valve stroke test is initiated, the HIM sends an alarm trip (relay) output to confirm that the test is in progress. Should the valve be stuck shut, the HIM initiates a second alarm to alert operator and maintenance personnel of the valve’s potentially dangerous condition.