Analog Input Function Blocks 1 And 2 - Siemens SITRANS LR200 Instruction Manual

Electronics temperature
The transducer block also monitors the internal temperature of the device electronics. If
the temperature exceeds permitted limits, it does not change the sensor value, but it does
change the status.The permitted limits correspond to those of the permitted ambient
temperature.
If a temperature limit is exceeded, the status changes. Peak indicators
check the maximum and minimum temperatures that have occurred.

Analog Input Function Blocks 1 and 2

The figure below shows how measured values are processed within the two Analog
Input Function Blocks (AIFB1 and AIFB2) to produce the device outputs, which are
communicated via cyclic transfer to PROFIBUS PA, and displayed on the LCD.
Analog Input Function Block function groups (simulation, mode and status)
Operator
Simulate
Parameter
enable
simulate
value and
2
Process Variable
status
from LTB
(Function Block
input)
Value Status
1.
Open View menu, scroll down to Peak Values, and click on Temperature tab in the
Peak Values window.
2.
The output from the Level Transducer Block can be called the Primary Value (or
Secondary Value). When it becomes the input to the AIFB, it is called the Process
Variable.
Page 72 SITRANS LR 200 (PROFIBUS PA) – INSTRUCTION MANUAL
on
Value FB
algorithm
Status
off
Operator
MAN
OUT
Out of
OUT Service
Failsafe
AUTO
MODE and
STATUS
handling
1
allow you to
2
Alarm
OUT
Limit
Value Status
Check
7ML19985HP01