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.
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