Siemens SIMATIC ET 200X, Manual

Page: 291 / 362

Technical Specifications
7-103
ET 200X Distributed I/O Device
EWA 4NEB 780601602-06
7.21.6 Behavior of the analog inputs and outputs during operation and
in the event of faults
This chapter deals with the following topics:
The dependency of the analog input and output values on the supply voltage of
the expansion module and the operating modes of the PLC
The behavior of the analog expansion modules as a function of the position of
the analog values in the relevant value range
The effect of errors on the analog inputs/outputs
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 7-59 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)
Supply vol-
tage L + to
ET 200X
Input value of the expansion
module with analog inputs
and (evaluation possible in
the CPU of the DP master)
Output value of the expan-
sion module with analog out-
puts
Power RUN L + applied Process value PLC value
on
7FFF
H
until the first conversion
after the module is switched on
or after the module is
parameterized
Until the first conversion ...
after the module is
switched on, a signal of
0 mA or 0 V is output.
after the module is
parameterized, the
previous value is output.
L + not applied 0 mA/0 V 0 mA/0 V
Power
on STOP L + applied 0 mA/0 V Substitute value/last value
(default: 0 mA/0 V)
L + not applied 0 mA/0 V 0 mA/0 V
Power – L + applied – 0 mA/0 V
off
L + not applied – 0 mA/0 V