9424200994 Rev N 147Analog Input ProtectionEight analog input elements monitor external analog input signals when two remote RTD modules areconnected via Ethernet or RS-485. Four analog inputs are provided with each RTD module. Refer to theRTD Module chapter for information on mounting, connections, communication setup, and specifications.The eight, identical remote analog input protection elements are designated ANALOG-1, ANALOG-2,ANALOG-3, ANALOG-4, ANALOG-5, ANALOG-6, ANALOG-7, and ANALOG-8. Element logicconnections are made on the BESTlogic™Plus screen in BESTCOMSPlus® and element operationalsettings are configured on the Remote Analog Input settings screen in BESTCOMSPlus. A summary ofthe logic inputs and outputs and operational settings appears at the end of this chapter.BESTCOMSPlus Navigation Path: Settings Explorer, Protection, Remote Analog InputsHMI Navigation Path: Settings Explorer, Protection, Analog ProtectionElement OperationModes of ProtectionTwo modes of protection are available: Over and Under.In Over mode, if the analog input value is above the Over Pickup setting, the element will pick up. InUnder mode, if the analog input value is below the Under Pickup setting, the element will pick up.SourceThe Source setting selects which analog input to monitor. Refer to the RTD Module chapter for moreinformation.Pickup and TripThe Pickup output occurs first, followed by the Trip output.PickupThe Pickup output becomes true when the measured remote analog input value increases above (Overmode) or decreases below (Under mode) the pickup setting. In BESTlogicPlus, the Pickup output can beconnected to other logic elements to annunciate the condition, control other elements in logic, and startthe fault recorder (logic element FAULTTRIG).Assertion of the Pickup output initiates a timer that begins timing to a trip. The duration of the timer isestablished by the Time Delay setting. A Time Delay setting of zero (0) makes the element instantaneouswith no intentional time delay.If the pickup condition subsides before the element delay expires, the timer and Pickup output are resetand no corrective action is taken.TripThe Trip output becomes true if a pickup condition persists for the duration of the element Time Delaysetting. In BESTlogicPlus, the Trip output can be connected to other logic elements and to a physicalrelay output to annunciate the condition and to initiate corrective action. If a target is enabled for theelement, the BE1-11g will record a target when the Trip output becomes true. See the Fault Reportingchapter for more information about target reporting.Inhibit LevelRemote analog input protection is inhibited when the monitored analog input value decreases below theInhibit Level setting. This setting is available only in the Under protection mode.BE1-11g Analog Input Protection
