Fail-Safe And Simulation; Hart Status; Simulation Process - Siemens SITRANS L 7ML5400 Operating Instructions Manual

7.14.2

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.
7.14.3

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 Process Variables within
PDM, AMS, FDT, and FC375/475.) Device status conditions within each tool will also indicate
that the device is in simulation mode (see Diagnostics (3.2.) (Page 246)).
7.14.4

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 in the
text area for status messages (see Measurement mode display: Normal operation (Page 52)).
Note
Simulation Enabled status will display on LCD even if other faults are present.
To stop simulation at any time, set the parameter for the function being simulated (Level
Simulation Enable (3.4.1.1.) (Page 263), Discrete Input 1 (3.4.2.1.) (Page 263), Discrete Input
2 (3.4.2.2.) (Page 264)) to Disabled.
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 Pump relay behaviour during
simulation (Page 156)).
4. Start simulation.
SITRANS LUT400
Operating Instructions, 04/2021, A5E33329501-AG
General Operation
7.14 Simulation
157