Siemens Simatic S7-300 CP 341 User Manual page 246

Glossary
Operating mode
The SIMATIC S7 programmable controllers have three different
operating modes: STOP, START-UP and RUN. The functionality of the CPU is different in
the various operating modes.
Operating system of the CPU
The operating system of the CPU organizes all the functions and process of the CPU that
are not connected to a special control task.
Parameter assignment
Parameter assignment refers to the setting of a module's behavior.
Parameters
Parameters are values that can be allocated. There are two different types of parameters:
block parameters and module parameters.
Point-to-point communication
In point-to-point communication the communication processor forms the interface between a
programmable controller and a communication partner.
Procedure
Procedure refers to the process of a data transmission according to a specific protocol.
Process image
The process image is a special memory area in the programmable controller. At the start of
the cyclic program the signal states of the input modules are transmitted to the process
image of the inputs. At the end of the cyclic program the process image of the outputs is
transmitted as signal state to the output modules.
Programmable controller
A programmable controller is a stored-program control consisting of at least one CPU,
various input and output modules, and operating and monitoring devices.
Protocol
All communication partners involved in data transmission must follow fixed rules for handling
and implementing the data traffic. Such rules are called protocols.
Rack
The rack is the module rail containing the slots for the modules.
246
www.gkbpx.com
CP 341 Point-to-Point Communication, Installation and Parameter Assignment
该文档是极速PDF编辑器生成，
如果想去掉该提示,请访问并下载：
http://www.jisupdfeditor.com/
Manual, 09/2008, A5E02191071-01