Effect On Analog Value Representation; Influence Of The Supply Voltage And The Operating State On Analog Input Values - Siemens SIMATIC ET 200S Manual

Measured values in the event of a wire break (as a function of diagnostic enables)
The following additional information applies to the current measuring range 4 to 20 mA:
Table 4-4 Measured values in the event of a wire break (as a function of diagnostic enables)
Format Parameter assignment
"Wire break" diagnostics enabled
S7 •
"Wire break" diagnostics disabled
•
"Overflow/underflow" diagnostics
•
enabled
"Wire break" diagnostics disabled
•
"Overflow/underflow" diagnostics
•
disabled
Measuring range limits for wire-break and underflow detection: at 1.185 mA
1
4.4

Effect on analog value representation

4.4.1

Influence of the supply voltage and the operating state on analog input values

The input values of the analog modules are dependent on the supply voltage for
electronics/sensors and on the operating state of the PLC (CPU of the DP master). The table
below shows this dependency.
Table 4-5 Dependence of the analog input values on the operating state of the PLC (CPU of the DP master) and the
supply voltage L+
Operating state of the PLC (CPU of
the DP master)
POWER ON RUN
POWER ON STOP
POWER OFF -
2AI I 2WIRE HS analog electronic module (6ES7134-4GB52-0AB0)
Manual, 01/2008, A5E01001734-02
Measured values
1
Decimal
32767
-32767
-32767
Supply voltage L+ on
ET 200S (power module)
L+ present
L+ missing
L+ present
L+ missing
L+ present
L+ missing
4.4 Effect on analog value representation
Hexadecimal
Diagnostics message "Wire break"
7FFF •
H
Measured value after leaving the
8000 •
H
underrange
Diagnostics message "Low limit
•
exceeded"
Measured value after leaving the
8000 •
H
underrange
Input value of the electronics module with analog
inputs (evaluation possible in the CPU of the DP
Process values
7FFF until first conversion after startup, or after
H
assignment of parameters for the module is
completed.
7FFF
H
Process value
7FFF
H
-
-
Analog value representation
Explanation
master)
21