13 Configuration
154
Input signal
Channel 1 has a special task; it is used as the reference curve for the other channels in the
group. All other channels in the group can be compared with channel 1 independent of one an-
other. If the configured tolerance band is exited, there is an alarm, and an alarm text is dis-
played in the "status and title line" and in the alarm list and event list.
Example of tolerance band being exceeded
The principle of the alarm corresponds to the alarm configuration of the individual analog chan-
nels.
Measured value (channel 1) = 21 °C
Measured value (channel 2) = 21 °C, tolerance band comparison is active.
Positive tolerance = 10 °C
Positive hysteresis = 2 °C
The alarm is generated if the current measured value (channel 2) is above 31 °C.
Ref. alarm text
(+)
Available as from channel 2 of a group.
Use default text or enter other text. The text entered (max. 21 characters) is
displayed in the "status and title line"
and entered in the alarm and event list if
the selected channel exits the tolerance
in a positive direction.
Ref. alarm text (-) Available as from channel 2 of a group.
Use default text or enter other text. The text entered (max. 21 characters) is
displayed in the "status and title line"
and entered in the alarm and event list if
the selected channel exits the tolerance
in a negative direction.
Parameter Selection/settings Description
NOTE!
The tolerance band comparison is only possible within the scaling limits. If there is a channel
that falls below or exceeds the range, this will result in both a min. and a max. alarm as with
all other functions (in this case, pos. tolerance and neg. tolerance).
(1) Negative alarm 1 Alarm on
(2) Positive alarm 0 Alarm off
(3) Hysteresis
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