32-12 9440300990
Analog Expansion Module DECS-250
Figure 32-12. Remote Analog Input Settings
RTD Inputs
BESTCOMSPlus
®
Navigation Path: Settings, Programmable Inputs, Remote RTD Inputs
HMI Navigation Path: Settings, Programmable Inputs, Remote RTD Inputs
The AEM-2020 provides eight user-configurable RTD inputs that can annunciate a latching or non-
latching alarm. The RTD inputs are always monitored and their status is displayed on the appropriate
metering screens. To make identifying the RTD inputs easier, a user-assigned name can be given to
each input.
Select the amount of hysteresis needed to prevent rapid switching of the alarm. Select the RTD type. A
user-adjustable arming delay allows configuration of the RTD input threshold monitoring in one of two
ways. (1) When the arming delay is set to zero, threshold monitoring is performed all the time, whether or
not excitation is enabled. (2) When the arming delay is set to a non-zero value, threshold monitoring
begins when the arming delay time has expired after system startup is complete. An out-of-range alarm,
configured on the Alarm Configuration, Alarms screen in BESTCOMSPlus, alerts the user of an open or
damaged RTD input wire. When enabled, Stop Mode Inhibit turns off RTD input protection when
excitation is stopped.
Each RTD input can be independently configured for over or under mode to annunciate an alarm when
the RTD input signal falls beyond the threshold. Alarms are configured on the Alarm Configuration,
Alarms screen in BESTCOMSPlus. A user-adjustable activation delay setting delays alarm annunciation
after the threshold has been exceeded.
The remote RTD inputs are incorporated into a BESTlogicPlus programmable logic scheme by selecting
them from the I/O group in BESTlogicPlus. For more details, refer to the BESTlogicPlus chapter.
BESTCOMSPlus
®
settings for remote RTD inputs are illustrated in Figure 32-13. Remote RTD Input #1 is
shown.
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