Instruction manual

SITRANS TW
A5E00054075-05
113
Functions / Operation by HART
4.2.17 Test functions
The SITRANS TW offers the following test functions for testing the hardware and
firmware:
• Resetting the SITRANS TW electronics:
Resetting the SITRANS TW electronics causes a RESET of the microcontroller
which is comparable with switching the power supply off and back on.
• Self test:
The microcontroller executes extensive hardware and firmware diagnostic
routines.
4.2.18 Simulation
With the diagnostic function “Simulation”, (quasi) measured data can be received
and processed without a process value being applied to the device. You can
therefore run individual processes “cold” and thus simulate process states. In
addition, the cables for the analog output and the message relay can be tested by
applying simulation values.
The value to be simulated can be preset as a fixed value or in the form of a ramp
function. The following simulations for measuring input and analog output are
possible:
Measuring input:
• Fixed value simulation or ramp simulation for primary process variable
• Fixed value simulation or ramp simulation for electronics temperature
Measuring output:
• Fixed value simulation of the analog output
The simulation of primary process variable, electronics temperature and analog
output is handled identically in parameterization and function so that only the general
simulation methods “fixed value” and “ramp function” are explained below using the
measuring input as an example.
For security reasons all the simulation data are only kept in the RAM. This means
any simulation is switched off when the device is restarted.