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Glossary
A
Automation
system
C
Configuring
CPU
D
DP master
DP slave
DP standard
CM35 Counter Module
(4) J31069-D0416-U001-A5-7618
An automation system is a programmable logic controller in a SIMATIC S7
system.
Configuring is the selection and combination of individual components of a
programmable controller, or the installation of required software (e.g., the
operating system on the M7 automation computer) and the adjustment to spe-
cial applications (e.g., by parameterizing the modules).
The CPU (Central Processing Unit) is a CPU of the programmable controller
or the automation system with control and computing unit, memory, system
program and interfaces to the I/O modules.
There are two kinds of configuration - - the actual configuration (i.e., the mod-
ules which are actually installed) and the desired configuration. The desired
configuration is specified with STEP 7 or COM ET 200 Windows or COM
PROFIBUS Windows. This permits the operating system to detect incorrect
configurations when it starts up.
When it has sending rights, the DP master can send data to other stations in
the PROFIBUS- - DP network and request data from other stations.
A master which conforms to part 3 of DIN standard E 19245 is called a DP
master.
A DP slave may exchange data with the DP master via the PROFIBUS- - DP
network only when requested by a DP master.
A slave which is used on the PROFIBUS bus with the PROFIBUS- - DP proto-
col and conforms to part 3 of the DIN standard E 19245 is called a DP slave.
The DP standard is the bus protocol of the ET 200 distributed I/O system
based on part 3 of the draft of DIN 19245.
Glossary-1
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