Proof testing HART device in a SIS is an important function to keep the system operating correctly. The DeltaV software does not perform proof tests on HART devices, but does include some functionality to assist in scheduling proof tests.
The DeltaV software contains several internal parameters that keep track of HART device proof tests.
| Parameter Name | Parameter | Writeable | Description |
|---|---|---|---|
| Test Interval | DEV_PT_TIME | Yes | Number of days between proof tests. |
| Reminder Interval | DEV_PT_REMINDER | Yes | Number of days before proof test to send alert. |
| Reset | DEV_PT_RESET | Yes | Writing a value of 1 to this parameter sets the Time since parameter to zero. |
| Time since | DEV_PT_TIME_SINCE | No | Time elapsed since last reset. |
| Last Test Time | DEV_PT_LAST | No | Absolute time when the last proof test was run displayed in ISO 8601 format. This is set to Unknown after a full download and until the next proof test of the device is complete. |
The general order of events to configure and respond to proof test alerts is the following:
if you suppress device alarm conditions they remain suppressed until they are manually unsuppressed from the detail display. The suppressed conditions are not unsuppressed automatically even by the subsequent timeout and reset of the proof test and acknowledgment of proof test alarms.
In the DeltaV Explorer hiearchy, right-click the device.
The Properties dialog opens.
This sets the internal parameters DEV_PT_TIME and DV_PT_REMINDER, respectively.
Download the configuration.
The absolute time of the last proof test (DEV_PT_LAST) is set on initial full download to Unknown until the next proof test for the device. The time since the last test (DV_PT_TIME_SINCE) is set to zero on initial full download. Both values are reset when the reset button on the device faceplate is clicked. The values of both parameters are preserved during subsequent partial downloads to preserve the proof test schedule.
Operate the plant until the proof test reminder alarm condition becomes active.
If the alarm condition contributes to a device alarm, acknowledge or suppress the alarm as desired.
Perform the proof test on the device when plant operations allow.
If you wait until the proof test alarm condition becomes active, DeltaV software triggers a device alarm.
DeltaV software does not perform the device proof test. Refer to the device manufacturer's documentation for the proof test procedures required for your use of the device.
After you complete the proof test, open the device faceplate and reset the days since the last test.
The Days since last test field on the faceplate begins counting up from zero.
If you have not done so previously, acknowledge the proof test alarm and reminder alarm to clear them.