Siemens SIMATIC S7-300 Module data Hardware And Installation Manual

Configuring
S7-300 Programmable Controller Hardware and Installation
A5E00105492-01
4-11
4.6 Selection and installation of cabinets
Necessity of cabinets
You can install the S7-300 in a cabinet for operation in larger plants or if ambient
interference or contamination is to be expected.
For compliance with UL/CSA standard it is required, amongst other things, to install
components in cabinets.
Selecting and dimensioning of cabinets
Note the following criteria when selecting and dimensioning cabinets:
• Ambient conditions at the cabinet's place of installation
• The specified mounting clearance for module racks (profile rails)
• Total power loss of all components in the cabinet
The ambient conditions (temperature, humidity, dust, chemical influence, explosion
hazard) at the cabinet's place of installation determine the degree of protection (IP
xx) required for the cabinet. Further information on degree of protection is found in
IEC 529 and DIN 40050.
Important cabinet types
The table below gives you an overview of the commonly used cabinet types. It
shows you the applied principle of heat dissipation, the calculated maximum power
loss and the degree of protection.
Table 4-5 Cabinet types
Open cabinets Closed cabinets
Enclosed
ventilation via
natural convection
Increased
enclosed
ventilation
Natural convection Forced convection
with rack fan,
improvement of
natural convection
Forced convection
with heat
exchanger, internal
and external
auxiliary ventilation

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)