Functional Safety
The following additional functionality is available for devices with Functional Safety:
Functional Safety
SIMATIC PDM
Device with display
(local operation)
Enable and disable Functional Safety
Menu command "Device >
Functional Safety"
Functional Safety Manual (Page 23)
9.1.2
Advanced functions
Description
Function
Description
Difference
The analog output signal is proportional to the difference between the measured
values of sensors 1 and 2.
Average value measurement
The analog output signal is proportional to the average value of the measured values
of sensors 1 and 2.
Max.
The analog output signal is proportional to the sensor with the highest value.
Min.
The analog output signal is proportional to the sensor with the lowest value.
Sensor drift
When the difference of the measured values between sensor 1 and sensor 2 exceeds
a defined limit, a sensor drift warning or sensor drift error is displayed.
Redundancy (hot backup)
The analog output signal is proportional to the primary sensor (sensor 1 or sensor 2)
as long as no error is detected and the input is within the user-defined limit. If an error
is detected at the primary sensor or the sensor 1 value is outside the user-specific
limit, the analog output signal becomes proportional to the redundant sensor (sen‐
sor 1 or sensor 2) and a warning is generated.
User-specific linearization - Callendar-
Van Dusen coefficients
Supports the change of the Callendar-Van Dusen coefficients.
Custom type - Linearization table
Supports the input of up to 60 breakpoints.
Custom type - Spline curve
Supports the input of up to 40 breakpoints.
Operating hours counter - Transmitter
electronics
Recording of the internal transmitter temperatures during operation, recording time
in each of 9 fixed sub-temperature ranges.
Operating hours counter - Sensors
Recording of the sensor measuring temperatures during operation, recording time in
each of 9 fixed sub-temperature ranges.
The subranges are specified separately for each sensor type.
Peak values - Transmitter electronics
Recording of the minimum and maximum internal transmitter temperature across
the entire device lifetime.
Peak values - Sensors
The recording of the min./max. measured values of the sensor(s) is saved. When the
measurement configuration is changed, the values are reset.
Parameter assignment
9.1 Overview of parameters and functions
SITRANS TH100/TH320/TH420/TR320/TR420/TF320/TF420 with 4 to 20 mA/HART
136
Operating Instructions, 05/2020, A5E41864807-AB
