User's Manual

7ML19985LT01 SITRANS LR560 (PROFIBUS PA) – OPERATING INSTRUCTIONS Page 127
mmmmm
E: Profile structure
Electronics temperature
The Transducer Block monitors the internal temperature of the device electronics. A
change in temperature can provide advance warning of a possible device failure, and
allow for preventive maintenance.
If a temperature limit is exceeded, the output value is unchanged but the output status
changes. (The permitted limits correspond to those of the permitted ambient
temperature.)
Peak indicators
1)
allow you to check the maximum and minimum temperatures that have
occurred.
AIFB (simulation, mode and status)
The input to the AIFB is a value with a status. The figure below shows how Measured
values are processed within an Analog Input Function Block to produce the device output
(communicated via cyclic transfer to PROFIBUS PA and displayed on the LCD).
How an Analog Input Function Block works
The AIFB provides a linear conversion to any desired units.
1) The value input to the AIFB is the measured value output from the Transducer Block,
in sensor units.
2) You can select any standard engineering units, or define a special unit, for the AIFB
output. Then scaling is applied.
(continued on next page)
1)
Open the menu View – Device Diagnostics, select Device Status, and click on the tab
Device Status to see peak temperature values.
enable
Status
OUT
VALUE
AUTO
MODE
and
STATUS
handling
AIFB INPUT:
measured
value from
TB
Value
Status
Alarm
Limit
Check
Out of Service
OUT
MANUAL
Value
simulate
value and
status
Value
Status
USER-
selected
Simulation
USER-selected Target Mode
OFF
SIMULATION
Fail-
safe
ON
OUTPUT
SCALING
Analog Input Function Block
AIFB
AIFB Input range
(typical Input (0 to 100%)
Output range:
Out
(AIFB Output)
straight to LCD
(same values
displayed on LCD as
PLC)