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EXCEL 50/100/500/600/800
EN2B-0092GE51 R1111
45
ALARM HANDLING
The Excel 50/100/500/600/800 alarm handling facility offers a high degree of
security by both storing and immediately displaying all alarms that occur at the
operator interfaces. The user chooses whether an alarm is critical or non-critical.
The user can also create personalized alarm texts, if required.
If your Excel 50/100/500/600/800 is connected to a front-end or a modem, critical
alarms are transmitted as high priority.
Point Alarms
The type of alarm generated by a datapoint depends on the type of datapoint
involved. Furthermore, there are alarm types which are valid for all datapoints or
which refer to system alarms in the control unit.
Limit monitoring In the case of an analog input or pseudo analog point, two maximum limits (limit
Max. 1, limit Max. 2) and two minimum limits (limit Min 1, limit Min 2) can be set for
a particular value. The limit values are entered in the datapoint description. Each
time this limit value is reached, irrespective of the direction, an alarm is triggered. If,
for example, a measured value takes on a value that exceeds a maximum limit or
drops below a minimum limit, an alarm is generated (alarm reached).
If the value returns from the alarm range to the normal range and, in doing so,
reaches a limit value in the opposite direction, an alarm signal is given in the same
way (alarm reached).
Since this sequence is identical for all four limit values, a total of eight different
alarm signals are possible for one analog datapoint. These eight alarm signal texts
are programmed permanently, and require no input from the user.
Alarm status In the case of a digital input or pseudo digital point, a decision can be made
whether or not an alarm check is desired. The entry is made in the datapoint
description.
Prior to V.2.04.x
Alarm Check Enter "Yes"
No Alarm Check Enter "No"
If an alarm check is desired, an alarm signal is produced if the digital point changes
from Active State to Passive State (alarm reached). When the digital point returns
to Active State, an additional signal is generated (alarm going). The two alarm
signal texts are permanently programmed and require no input from the user.
The fixing of active and passive states must be carried out in the datapoint
description under the attribute "Active State".
0 = Active state with "0" signal
1 = Active state with "1" signal
V.2.04.x
The attribute "Active State" is fixed to “1”. This means that the alarm status is no
longer dependant upon the attribute "Active State", but rather only upon the
physical contact status and upon the logical status as defined in the online attribute
"Normally Open/Normally Closed".
Maintenance Alarm In the case of a digital input, a digital output, or a pseudo digital point, the hours run
time entry can be activated and a maintenance interval can be fixed. If the latter is
exceeded, an alarm signal is generated. The text of this signal is permanently
programmed and requires no input from the user. If a check is to be skipped, a "0"
is entered in the datapoint descriptor under the attribute "Maintenance Interval".
Totalizer A pulse input signal interval can be fixed for a totalizer input that, if exceeded,
triggers an alarm signal. The alarm signal text is permanently programmed and
requires no input from the user. If a check is not desired, a "0" is entered in the
datapoint description under the attribute "Interval Count".