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5.8.3 Alarm
Configuration
The interface supports twenty independently-configurable alarms. As shown in Figure 54, each alarm
has a variety of configuration elements, which will be explained further below.
Figure 54: Alarm Configuration Box
Alarm Selection:
This drop-down box allows the selection of one of the twenty available alarms. When
an alarm is selected, that alarm’s current configuration parameters will be populated in the alarm
configuration box.
“Enable” Check Box:
If checked, this alarm is active and will be evaluated every second. If unchecked,
this alarm is inactive and will therefore not be evaluated.
Func Code:
Enter the inverter function code that this alarm will continuously monitor. For example, the
alarm displayed in Figure 54 is configured to monitor M14, which is the operation status register.
Logical Comparison:
Choose a comparison operator which will be used to compare the current value
of the indicated “Func Code” with the reference “Comparison Value”. Available selections are “less than”
(<), “less than or equal to” (<=), “greater than” (>), “greater than or equal to” (>=), “not equal to” (!=), and
“equal to” (=).
Comparison Value:
The reference comparison value is comprised of two subcomponents: a “Mask”
field and a “Value” field. Each time the alarm is evaluated, the current value of the indicated “Func Code”
is first bit-wise “AND”ed with the “Mask” field. The resulting derived value is then compared with the
“Value” field by way of the “Logical Comparison” operator. While the “Mask” field is always a
hexadecimal number, the display and entry radix of the “Value” field can be changed between decimal
and hexadecimal with the associated “DEC” and “HEX” buttons.
Function codes that correspond to “analog” process variables (e.g. frequencies, voltages, etc.) should
typically have their “Mask” fields set to 0xFFFF, which causes all data bits to be retained for the “Value”
field comparison. For function codes that correspond to “enumerated” process variables (e.g. status
words where each bit of the function code indicates a different item), however, the “Mask” can be
chosen to single out one or more specific data bits of the function code. For example, the “Mask” value
of 0x0800 displayed in Figure 54 isolates bit #11 of the operation status register, which indicates
whether or not an inverter alarm exists. The “Value” field is also set to a hexadecimal value of 0x0800,
so the alarm condition will be evaluated as “true” when bit #11 of the operation status register equals 1.
The Condition Must Remain True For A Minimum Of:
Alarm analysis processing is performed by the
interface card once per second. Enter the number of seconds that the condition must be continuously
evaluated as “true” for the alarm to be triggered. A time of 0 seconds means that just a single evaluation
of “true” will immediately trigger the alarm.
Send Additional Reminders While The Condition Remains True:
If this check box is unchecked,
then only one email transmission event will occur when an alarm condition is triggered: further email
transmissions will not be attempted for this alarm unless the alarm condition is first evaluated as “false”
(which resets the alarm), and then once again is triggered by a subsequent event.
CTi Automation - Phone: 800.894.0412 - Fax: 208.368.0415 - Web: www.ctiautomation.net - Email: [email protected]
