Siemens SIMATIC User Manual

Principles of analog modules
5.4 Response of the analog modules
S7-300 Module data
286 Manual, 06/2017, A5E00105505-AJ
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
Supply voltage L+
at the analog
module
Input value of the analog input mod-
ule
Output value of the analog output
module
POWER
ON
RUN L+ present
Measured value
CPU values
7FFF
H
, until the first conversion after
POWER ON is completed, or when
the module has been programmed.
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.
L+ missing
Overflow value
0 mA / 0 V
POWER
ON
STOP L+ present Measured value Substitution value / last value
(default: 0 mA / 0 V)
7FFF
H
, until the first conversion after
POWER ON is completed, or when
the module has been programmed.
L+ missing
Overflow value
0 mA / 0 V
POWER
OFF
-
L+ present
-
0 mA / 0 V
L+ missing
-
0 mA / 0 V
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)

Siemens SIMATIC Specifications

General

Product type designation	SIMATIC
CPU	Varies by model
Memory	Varies by model
Input/Output	Varies by model
Communication	Varies by model
Programming Language	STEP 7
Operating Temperature	0°C to 60°C (varies by model)
Protection Class	IP20
Category	Programmable Logic Controller (PLC)