Continuous monitoring of the measured quantity
SEMOD54417-140 v4
Users can continuously monitor the measured quantity available in the function block by means of
four defined operating thresholds, see figure 190. 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
190.
IEC05000657-2-en.vsdx
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 V2 EN-US
Figure 190: 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
190.
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.
Actual value of the measured quantity
SEMOD54417-150 v3
The actual value of the measured quantity is available locally and remotely. The measurement is
continuous for each measured quantity separately, but the reporting of the value to the higher
levels depends on the selected reporting mode. The following basic reporting modes are available:
• Cyclic reporting (
Cyclic
)
• Magnitude dead-band supervision (
Dead band
)
• Integral dead-band supervision (
Int deadband
)
1MRK 502 066-UUS B Section 7
Impedance protection
363
Technical manual
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