Instruction manual

SITRANS TW
114 A5E00054075-05
Functions / Operation by HART
Figure 17 Principle circuit diagram simulation
4.2.18.1 General information
• As long as the simulation is switched on, the transmitter does not react to sensor
input signals.
• No simulation is possible in difference or average circuit.
• If thermocouples are simulated, a fixed reference point temperature of 0°C is
used for the simulation.
• Simulation of the electronics temperature has no influence on the analog output.
It can only be observed through the HART communication interface.
4.2.18.2 Simulation of measuring input
Simulation as a fixed value
Under consideration of the physical unit, fixed simulation values can be parameter-
ized for both simulation lines (primary measured value and electronics temperature).
The analog output value is set according to the value defaulted for the primary meas-
ured value.
Simulation with a periodic ramp function
In addition to the adjustable fixed values a periodically recurring ramp function can
also be parameterized for both simulation paths. A settable start and end value
determines the respective limits between which the simulation values move with a
Measuring channel 1
Measuring channel 2
T electronics
Measuring
Simulation
values
I constant
Values primary
Measured value
values
T electronics
Set value
Ramp
Measured value calculation
primary
measured value
secondary
measured value
tertiary
measured value
T electronics
e.g.