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clamping might be overridden by the zero point clamping used for the measurement
values within CVMMXN.
Continuous monitoring of the measured quantity
Users can continuously monitor the measured quantity available in each function block by
means of four defined operating thresholds, see figure
. The monitoring has two
different modes of operating:
•
Overfunction, when the measured current exceeds the High limit (
XHiLim
) or High-
high limit (
XHiHiLim
) pre-set values
•
Underfunction, when the measured current decreases under the Low limit (
XLowLim
)
or Low-low limit (
XLowLowLim
) pre-set values.
X_RANGE is illustrated in figure
en05000657.vsd
X_RANGE= 1
X_RANGE = 3
X_RANGE=0
Hysteresis
High-high limit
High limit
Low limit
Low-low limit
X_RANGE=2
X_RANGE=4
Y
t
X_RANGE=0
IEC05000657 V1 EN
Figure 203:
Presentation of operating limits
Each analog output has one corresponding supervision level output (X_RANGE). The
output signal is an integer in the interval 0-4 (0: Normal, 1: High limit exceeded, 3: High-
high limit exceeded, 2: below Low limit and 4: below Low-low limit). The output may be
connected to a measurement expander block (XP (RANGE_XP)) to get measurement
supervision as binary signals.
The logical value of the functional output signals changes according to figure
The user can set the hysteresis (
XLimHyst
), which determines the difference between the
operating and reset value at each operating point, in wide range for each measuring
channel separately. The hysteresis is common for all operating values within one channel.
Section 12
1MRK 511 287-UUS A
Monitoring
440
Technical manual
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