Siemens SIMATIC S7-300 Module data Reference Manual

Analog Modules
4-135
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03
Prolongation of the scan time with a wire-break check
The wire-break check is a software function of the module that is available in all
operating modes.
In the 8-channel hardware and software filter operating modes, the scan time
of the module is doubled, irrespective of the number of channels for which
wire-break has been enabled.
In the 4-channel hardware filter operating mode, the module interrupts
processing of the input data 170 ms and performs a wire-break check. In other
words, each wire-break check prolongs the scan time of the module by 170 ms.
Smoothing of the measured values
You fill find information that is generally applicable to the smoothing of analog
values in Section 4.6.
Special characteristic with short-circuit to M or L
If you short an input channel to M or L, the module does not suffer any damage.
The channel continues to issue valid data; neither is a diagnosis reported.
Diagnostics
You will find the diagnostic messages that are grouped under the “group diagnosis”
parameter in Table 4-46, on page 4-72.
4.23.2 Measuring Methods and Measuring Ranges of the
SM 331; AI 8 x RTD
Measuring Methods
You can set the following measuring methods for the input channels:
• RTD 4-conductor measurement
• RTD 3-conductor measurement
• Resistor 4-conductor measurement
• Resistor 3-conductor measurement
You perform the setting with the “measuring method” parameter in 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)