Basler BE1-CDS240, Instruction Manual

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D2850-09.vsd
06-29-99
RA-MAJ=0
Logic
Alarm
Reset
Logic
RA-MIN=0
ARSTKEY
HMI RESET KEY
Figure 6-27. 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 6-27 shows the alarm reset logic.
After an operation, alarms information can be viewed using BESTCOMS. Select Metering from the
Reports pull-down menu. From the View pull-down menu, select Alarms Status (Figure 6-28).
Figure 6-28. Alarms Status, Metering Screen
The RA (report alarms) command can be used to read detailed alarm reports and reset latched alarms.
Links between Programmable Alarms and BESTlogic
Several links between the programmable alarms and BESTlogic allow alarm functions to be used in the
logic scheme and programmable logic functions to be used in the alarm reporting function.
Programmable Alarms Controlled by BESTlogic Elements
Virtual Outputs VO13, VO14, and VO15 are driven by BESTlogic expressions and are available in the
programmable alarms function. These three virtual outputs have labels that can be assigned meaningful
names. Then, when a logic condition that is used for an alarm exists, the label will be reported in the
alarm reporting function.
Programmable Alarms Reset
Programmable alarms can be reset by any one of three methods:

The programmable alarms reset logic expression becomes TRUE.

Pressing the front panel Reset key when HMI Screen 1.2, \STAT\ALARMS is active.

By connecting the alarms reset logic in BESTCOMS. Alternately, this can be done using the SA-
RESET ASCII command.
9365200990 Rev F BE1-CDS240 Reporting and Alarm Functions 6-43