Siemens SIMATIC Manual page 286

Principles of analog modules
5.4 Response of the analog modules
Influence of the supply voltage and operating state on the modules
The IO values of analog modules are determined by the CPU operating state and the
module's supply voltage.
Table 5- 41 Dependencies of the analog IO values on the CPU's operating State and on the L+ supply voltage
CPU operating state
POWER RUN
ON
POWER STOP
ON
POWER -
OFF
Reaction to power failure
Power failure at analog modules is always indicated by their relevant SF LED. This
information is also available on the module (in diagnostics buffer data.)
Diagnostics interrupt triggering is based on parameter settings.
See also
Programming analog modules (Page 294)
286
Supply voltage L+ Input value of the analog input mod-
at the analog ule
module
L+ present Measured value
7FFF
POWER ON is completed, or when
the module has been programmed.
L+ missing Overflow value
L+ present Measured value
7FFF
POWER ON is completed, or when
the module has been programmed.
L+ missing Overflow value
L+ present -
L+ missing -
, until the first conversion after
H
, until the first conversion after
H
Output value of the analog output
module
CPU values
Until the first conversion...
•
after POWER ON, the module
outputs a 0 mA or 0 V signal.
•
after programming is successfully
completed, it outputs the previous
value.
0 mA / 0 V
Substitution value / last value
(default: 0 mA / 0 V)
0 mA / 0 V
0 mA / 0 V
0 mA / 0 V
S7-300 Module data
Manual, 06/2017, A5E00105505-AJ