Analog Electronic Modules; Behavior Of The Analog Modules During Operation And In The Event Of Problems - Siemens SIMATIC ET 200iSP Operating Instructions Manual

Analog electronic modules

13.1 Behavior of the analog modules during operation and in the event of
problems
Influence of the power supply and the operating state
The input and output values of the analog modules are dependent on the supply voltage for
electronic components/sensors and on the operating mode of the PLC (CPU of the DP master).
Table 13-1 How the analog input/output values depend on the operating mode of the PLC (CPU of the DP master) and the
supply voltage L +
Operating mode of the
PLC (CPU of the DP
master)
POWER RUN
ON
POWER STOP
ON
Effect of the value range for the analog input
The behavior of the electronic modules with analog inputs depends on where the input values
are in the value range. The following table indicates this:
Table 13-2 Behavior of the analog modules depending on the position of the analog input value in the value range
Measured value within
Nominal range
Overrange/underrange
Overflow
Underflow
until valid measured values are available
ET 200iSP
Operating Instructions, 11/2017, A5E00247483-07
Supply voltage L + Input value of the electronic module
on ET 200iSP with analog inputs (evaluation possi‐
(power supply ble in the CPU of the DP master)
module)
S7 format
L+ present Process values
7FFF
switching on or after assigning param‐
eters to the module
L+ present Process value
L+ missing 7FFF
until the first conversion after
H
H
Input value in the SIMATIC S7 format
Measured value
Measured value
7FFF
H
8000
H
7FFF
H
13
Output value of the electronic module
with analog outputs
PLC values
Until the first value output:
● After startup, a signal of 0 V is
output.
● Dependent on the "Behavior at
CPU-Master-STOP" parameter
Dependent on the "Behavior at CPU-
Master-STOP" parameter
-
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