Siemens 6MD85, Manual

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Temperature Sensor
Logic
[lotmpval-311012-01.tif, 1, en_US]
Figure 5-79 Logic Diagram of the Temperature Sensor Function Block
Measured Temperature Value
The Temperature sensor function block processes one single measured temperature value delivered from the
RTD unit for the assigned sensor. 12 temperature sensor function blocks are always available in each RTD unit
function (both via Ethernet and serial), even if fewer sensors are connected to the RTD unit.
Various temperature sensor types are supported: Pt100, Ni100, and Ni120 sensors. The function block is noti-
fied regarding the selection of connected type via the
Sensor type
parameter.
The function block delivers a measured temperature value in °C or °F as an output variable. The measured
temperature value is available as an operational measured value and can be monitored by the Temperature
supervision function.
Error Responses
If the measured input value is determined to be incorrect, the quality attribute of the output measured
temperature value is set to
invalid
. The statuses for Health and Error take the statuses in accordance with
the following table:
Table 5-11 Error response
Error Description Health Status Error Status
Sensor or line short circuited Alarm Yes
Sensor or line interrupted Alarm Yes
Measured temperature value
outside the valid measuring range
specified in the technical data. The
valid measuring range depends on
the sensor type. Alarm Yes
Sensor not connected OK No
Application and Setting Notes
Parameter: Sensor type
•
Default setting
(_:11611:102) Sensor type
=
Pt 100
The
Sensor type
parameter is used to set the sensor element used. You can select between
Pt 100
,
Ni
100
and
Ni 120
.
5.7.7.5
5.7.7.6
Function-Group Types
5.7 Function-Group Type Analog Units
SIPROTEC 5, High-Voltage Bay Controller, Manual 281
C53000-G5040-C015-9, Edition 11.2017