FOXBORO FBM201d P0922YK Communication module

Threshold and Delay Settings: Many SPC alarms and shutdowns include threshold and delay adjustments. This means that a value must exceed the threshold continuously for a duration equal to the delay time before the alarm or shutdown becomes active. Latching and Non-Latching Response: All SPC alarms and shutdowns are either latching or non-latching. Some alarms and shutdowns are pre-defined to be either latching or non-latching, while other alarms and shutdowns can be configured to be either. A non-latching alarm or shutdown will go away if the cause of the alarm or shutdown goes away. A latching alarm or shutdown does not go away until the alarm or shutdown cause goes away and an alarm/shutdown reset is performed

Understanding SPC Alarms and Shutdowns

 An alarm is an indication to the user that there is a condition which may require specific action on the user’s part. A shutdown causes the SPC to take action by forcing the actuator current to zero. Some conditions are pre-defined to be either an alarm or a shutdown, while other conditions can be configured to be either. When shut down, the SPC driver output current is forced to zero. The SPC being shut down does not imply that the valve is at minimum position, only that the actuator current is zero. A specific actuator’ s design and setup determine its behavior when the current is zero.

Alarm and Shutdown Reset

Alarms If the source of an alarm is still present, a reset has no effect on the alarm. If the source of a latched alarm is no longer present, a reset clears the alarm. Shutdowns Performing a reset on an SPC when it is shut down causes it to restore current to the actuator and attempt to position the actuator. If the shutdown cause is still present, the SPC will shut down again.

The Overview page includes a check box labeled Calibration will be performed through DeviceNet. When this box is checked, calibration can only be performed through DeviceNet. When this box is unchecked, calibration can only be performed using the service tool.

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