Siemens SIMATIC S7-300 Module data Reference Manual

Analog Modules
4-106
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03
Special characteristics of unused channels for some measuring ranges
Since configured inputs can remain unused because of the channel group
generation, you must take note of the following special characteristics of these
inputs to enable the diagnostic functions on the used channels.
• Measuring range 1 to 5 V: Connect the unused input in parallel with a used
input of the same channel group.
• Current measurement, 2-wire transmitter:
There are two ways to use the channels:
a) Leave the unused input open and do not enable diagnostics for this
channel group. Otherwise, if diagnostics are enabled, the analog module
triggers a single diagnostic interrupt and the SF LED of the analog module
comes on.
b) Connect the unused input with a resistance of 1.5 to 3.3 kW. You may then
enable diagnostics for this channel group.
• Current measurement 4 to 20 mA, 4-wire transmitter: Connect the unused
input in series with an input of the same channel group.
Measuring ranges
You perform the setting of the measuring ranges by means of the measuring range
modules on the module and with the “measuring method” parameter in STEP 7.
Table 4-62 Measuring Ranges of the SM 331; AI 8 x 14 bits High Speed
Method Selected
Measuring Range
(Type of Sensor)
Measuring Range
Module Setting
Description
U: Voltage " 1 V A
You will find the digitized
analog values in the
" 5 V
1 to 5 V
" 10 V
B
You will find the digitized
analog values in the
reference manual, section
4.3.1, in the voltage
measuring range
4DMU: Current (4-wire
transmitter)
0 to 20 mA
4 to 20 mA
" 20 mA
C
You will find the digitized
analog values in the
reference manual, section
4.3.1, in the current
2DMU: Current (2-wire
transmitter)
4 to 20 mA D
reference manual, section
4.3.1, in the current
measuring range
Default Settings
The default settings of the module in STEP 7 are the “voltage” measuring method
and the "”10 V” measuring range. You can use this combination of measuring
method and measuring range without parameterizing the SM 331;
AI 8 x 14 bits High Speed with STEP 7.

Siemens SIMATIC S7-300 Module data Specifications

General

Series	S7-300
Manufacturer	Siemens
Protection Class	IP20
System	SIMATIC S7-300
Digital Inputs	Varies by module
Digital Outputs	Varies by module
Analog Inputs	Varies by module
Analog Outputs	Varies by module
Central Processing Unit	Varies by CPU model
Supply Voltage	24V DC or 120/230V AC
CPU Type	Varies (e.g., CPU 312, CPU 315, etc.)
Memory	Varies by CPU model
Communication Interfaces	MPI, PROFIBUS
Programming Languages	LAD, FBD, STL, SCL, GRAPH
Operating Temperature	0°C to 60°C
Storage Temperature	-40°C to 70°C
Relative Humidity	10% to 95% (non-condensing)