Siemens ET 200S Manual page 410

Analog Electronic Modules
Effect of the Supply Voltage and the Operating Mode
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 12-68 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 Supply Vol-
of the PLC (CPU tage L + to
of the DP Master) ET 200S
(Power Mo-
Power RUN L + applied
on
L + not applied
Power STOP L + applied
on
L + not applied
Power – L + applied
off
L + not applied
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 12-69 illustrates this.
12-54
Input Value of the Electronic
Module with Analog Inputs
(Evaluation Possible in the
CPU of
dule) the DP Master)
Process values
7FFF until the first conversion
H
after switching on or after
parameterization of the module
7FFF
H
Process value
7FFF
H
–
–
Output Value of the Electro-
nic Module with Analog Out-
puts
PLC values
Until the first value output:
S
After switching on, a signal
of 0 mA or 0 V is output
S
Dependent on the "Behavior
at CPU-Master-STOP"
parameter
–
Dependent on the "Behavior at
CPU-Master-STOP" parameter
–
Dependent on the "Behavior at
CPU-Master-STOP" parameter
–
Distributed I/O System ET 200S
EWA 4NEB 780 6024-02 07