Fail-Safe And Simulation; Hart Status; Simulation Process - Siemens SITRANS LUT400 Series Operating Instructions Manual

Fail-safe and Simulation

When simulating Level or Discrete Inputs, the LUT400 will never enter the Fail-safe state.
Faults that would normally cause a fail-safe condition (such as a broken cable or LOE)
may still occur, but a fail-safe condition will not be reported on the device during
simulation.
Note: As fail-safe will not be reported during simulation, a bench simulation of the
LUT400 can be run without a transducer connected.

HART status

When using HART communications via software tools such as PDM, AMS, FDT, and
FC375/475, the Level value and the readings derived from level will display simulated
values (when level or discrete input simulation is enabled on LUI). (See
within PDM, AMS, FDT, and FC375/475.) Device status conditions within each tool will also
indicate that the device is in simulation mode (see

Simulation process

Simulation is an iterative process whereby parameters are adjusted and corresponding
results are viewed in Measurement Mode. Level and Discrete Inputs can be simulated
separately, or concurrently. When either simulation is enabled, the LCD displays
Simulation Enabled
display: Normal operation
Note: Simulation Enabled
To stop simulation at any time, set the parameter for the function being simulated (
Level Simulation Enable
In general, to run a simulation:
1. Select the function to be simulated: Level or Discrete Input (can be simulated
concurrently).
2. Set simulation parameters if performing a Level simulation.
3. Decide if pumps will be active during simulation (see
simulation
4. Start simulation.
Simulating a fixed level
1. Set the desired fixed level value in
3.4. 1 .3. Ramp
2. Set
3.4.3. Pump Activations
3. Enable
simulation
3.4. 1 .1. Level Simulation Enable
4. Set
3.4.1.1. Level Simulation Enable
Set
Page 122 SITRANS LUT400 (HART) – OPERATING INSTRUCTIONS
in the text area for status messages (see
on page 34).
status will display on LCD even if other faults are present.
3.4.2.1. Discrete Input 1
,
on page 121).
to Disabled.
if desired (see
on page 121).
to Disabled when you wish to stop level simulation.
Diagnostics
3.4.2.2. Discrete Input 2
,
Pump relay behaviour during
3.4.1.2. Level Value
.
Pump relay behaviour during
to Enabled to start level simulation.
Process Variables
).
Measurement mode
3.4.1.1.
) to Disabled.
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