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46
ICC
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.
Register: Enter the drive register number that this alarm will continuously monitor.
For example, the alarm displayed in Figure 44 is configured to monitor register 1302,
which is “inverter status 1”.
Logical Comparison: Choose a comparison operator which will be used to compare
the current value of the indicated “Register” 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 “Register” 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.
Registers 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 registers that correspond to
“enumerated” process variables (e.g. status words where each bit of the register
indicates a different item), however, the “Mask” can be chosen to single out one or
more specific data bits of the register. For example, the “Mask” value of 0x1000
displayed in Figure 44 isolates bit #12 of “inverter status 1”, which indicates whether
or not the drive is in an emergency stop condition. The “Value” field is also set to a
hexadecimal value of 0x1000, so the alarm condition will be evaluated as “true” when
the emergency stop bit 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.
If this check box is checked, then as long as the alarm condition continues to be
evaluated as “true”, subsequent email transmissions will be automatically retriggered
every indicated number of minutes for a maximum of the indicated number of times.