Siemens SITRANS LUT400, Руководство по эксплуатации

Страница: 433 / 601

Page 120 SITRANS LUT400 (HART) – OPERATING INSTRUCTIONS A5E33329501
mmmm
m
Gener
a
l Oper
at
ion
When using the Web Browser tool to upload logs, individual log files are stored on the PC
in the universal CSV (comma-separated-value) format for ease when importing to other
programs, such as spreadsheets or other data-analysis packages. For a list of field
names, see
Data Logging
on page 269
.
To clear entries when memory is full, browse to Delete Logs (2.10.5) and select Yes to
permanently delete all logs.
Simulation
The SITRANS LUT400 supports simulation from the LUI. Level and discrete inputs can be
simulated, separately or concurrently.
Level simulation
In level simulation, the LCD reacts to the simulated level changes, and activates
relays based on the setpoints programmed. The material level can be set to
continuously sweep through the measurement range, from Low Calibration Point to
High Calibration Point and back again (using
3.4.1.3. Ramp
,
3.4.1.4. Ramp Rate
), or the
material level can be held at a specific value (using
3.4.1.2. Level Value
).
Discrete Input simulation
When discrete inputs are simulated, the DI icon on the LCD will show the simulated
states of the discrete inputs. Any programming that uses the discrete inputs, such as
the backup level override, will use the simulated values.
In simulation mode, some of the LUT400’s configured functionality will respond to the
simulated value, including:
• Readings that are based on Level - The LUT400 supports simulation of Level values
only. Other simulated values cannot be entered, however, these values will be
calculated correctly when Level is simulated. Space, Distance, Volume, Flow, and
Head will be calculated [see Sensor Mode (2.1.2.) on page 138].
• The milliamp output - The current loop output will also track the corresponding
reading (Level, Space, Distance, Volume, Flow, or Head depending on which of
these it is configured to track). [See Current Output Function (2.5.1.) on page 144.]
• Alarms - Any alarms that have been configured, including any relays configured for
alarms, will activate based on the simulated value. [See Alarms (2.8.) on page 162.]
• Relays configured for pumps - If the device is configured for a pump application then
the corresponding relay indicators on the LCD will also show when the pumps
would activate. By default the relay contacts themselves will not activate in
simulation mode, but this behaviour can be changed if desired (see
Pump relay
behaviour during simulation
on page 121).
• Logging - Log files will reflect the simulated values. This includes logging simulated
high-flow/low-flow conditions, and any alarms.