Parameterization
Page 60 of 72
MSM-USM2G-BA-UK-004
Dialog Reports
Parameter
Interpretation
AI
Terminal of the analog value
Signalname
The signal name consisting of ASCII characters is used to identify the value and is
also displayed in the diagnostic monitor (see section
”).
Measuring
mode
The inputs can be configured as voltage or current inputs depending on the
application. The following options are available:
0 … 10 V
-
10 … 10 V
0 … 20 mA
4 … 20 mA
In mode 4 ... 20 mA a wire break monitoring is active. At a current value below 4 mA,
the device error "4-8" is generated. The further processing of the error is described in
the submenu "Parameter / System / Device error" is set.
In the main menu "Monitor", the corresponding analog input is indicated by an orange
background.
Filter
The measured values are filtered after acquisition to suppress unwanted short-term
interference. The filter is implemented as a first order low pass filter. The
parameterizable time constant defines the time after which the filtered value has
reached 62% of the input value in the event of a sudden change in the input value.
The time constant is specified in the unit seconds.
Table 5.6: Basic settings of the analog inputs
When the analog values are changed, alarms can be generated in the fault annunciator during one of
the following operations.
when the limit value is exceeded
if the value falls below the limit value
if the measured value is outside a range
if the measured value is within a range
Parameter
Interpretation
Reporting
channel
Channel on which an alarm is generated if this results from the following parameters.
Evaluation
The analog values can be monitored according to the methods mentioned above.
The evaluation method must be defined in this parameter:
above limit value
below limit value
outside of range
within range
Lower limit
lower limit value
Higher limit
higher limit value
Hysteresis
A hysteresis can be defined to avoid the generation and deletion of fault alarms in
case of small changes of the analog value. A fault is only generated or deleted when
limit value + (hysteresis / 2) exceeds the measured value or
limit value - (hysteresis / 2) undercuts the measured value
IA
In order to prevent the generation of a fault alarm with the evaluation method "out of
range" while the sensor value is still outside of range when the plant is started up, this
box can be activated. Fault signal processing is only activated when the analog value
has entered the range once.
Table 5.7: Limit value formation of analog inputs
