Siemens SIMATIC S7-300 Module data Hardware And Installation Manual

Glossary
S7-300 Programmable Controller Hardware and Installation
12-2 A5E00105492-01
Bus
A bus is a communication medium connecting several nodes. Data transmission
can be serial or parallel across electrical conductors or optical waveguides.
Chassis ground
Chassis ground is the totality of all the interconnected inactive parts of a piece of
equipment on which a hazardous touch voltage cannot build up even in the event
of a fault.
Clock memories
Memories that can be used for clocking purposes in the user program (1 memory
byte).
Note
Note in the case of S7-300 CPUs that the clock memory byte is not overwritten in
the user program.
Code block
A SIMATIC S7 code block contains part of the STEP 7 user program. (In contrast:
a --> data blocks (DB) only contain data.)
Communication processor
Communication processors are modules for point-to-point and bus communication.
Compress
The PG's online function "Compress" is used to align all valid blocks contiguously
in the RAM of the CPU at the start of the user memory. This eliminates all gaps
which arose when blocks were deleted or modified.
Configuration
Assignment of modules to racks/slots and (e.g. for signal modules) addresses.

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)