Basler BE1-CDS220, Instruction Manual

Page: 161 / 476

BE1-CDS220 Reporting and Alarm Functions 6-43
Logic variables for ALMMAJ, ALMMIN, and ALMLGC can also be set to operate any of the output
contacts to give an indication that an alarm condition exists. Section 7, BESTlogic Programmable Logic,
provides more details about this feature.
The status of the three front-panel LEDs (Relay Trouble, Minor Alarm, and Major Alarm) can be read
through the communication ports by using the RG-STAT command. Alarm status is given in the
DIAG/ALARM line of the General Status Report. Refer to the General Status Reporting subsection for
more information about obtaining relay status with the RG-STAT command. Figure 6-25 shows the alarm
reset logic.
D2850-09.vsd
06-29-99
RA-MAJ=0
Logic
Alarm
Reset
Logic
RA-MIN=0
ARSTKEY
HMI RESET KEY
Figure 6-25. Alarm Reset Logic
The Reset key of the HMI is context sensitive. That is, the functionality depends upon what screen is
currently being displayed. BESTlogic variable ARSTKEY takes advantage of this to allow the front panel
Reset key to be used in the programmable logic scheme when Alarm Screen 1.2, \STAT\ALARMS, is
active. An example of the use of this logic variable is to break the seal-in for a logic expression. The logic
expression can be programmed so that the seal-in function uses VO13, VO14, or VO15. If the virtual
output expression is included in one of the programmable alarm masks, the automatic display priority
logic will cause the display to go to Alarm Screen 1.2, \STAT\ALARMS. When the HMI Reset key is
pressed, the ARSTKEY logic variable is asserted and the logic expression seal-in is broken. See Section
8, Application, Application Tips, for more information. Pressing the HMI Reset key while the Alarm screen
is displayed, will clear any latched alarms that are not currently active. Refer to Table 6-21 for a list of
latching alarm points and self-clearing alarm points. Figure 6-25 shows the alarm reset logic.
After an operation, alarms information can be viewed using BESTCOMS. Select Metering from the
Reports pull-down menu. Select the Start Polling button. See Figure 6-26.
Figure 6-26. Alarms Status, Metering Screen