Glossary
Glossary-4
ET 200S Interface Module IM 151/CPU
A5E00058783-01
Distributed I/O Systems
These are input/output units that are not located in the base unit; instead, they
are distributed at some distance from the CPU. The following are examples of
such units:
ET 200S, ET 200M, ET 200B, ET 200C, ET 200U, ET 200X, ET 200L
DP/AS-I Link
S5-95U with a PROFIBUS-DP slave interface
Other DP slaves from either Siemens or other vendors
The distributed I/O systems are connected to the DP master via PROFIBUS-DP.
DP master
A Master that complies with EN 50170, Volume 2, PROFIBUS, is referred to
as a DP master.
DP Slave
A slave on the PROFIBUS bus system with the PROFIBUS-DP protocol that
complies with EN 50170, Volume 2, PROFIBUS standard is referred to as a DP
slave.
DP Standard
The DP standard is the bus protocol of the ET 200 distributed I/O system based
on EN 50170, Volume 2, PROFIBUS.
Error Display
The error display is one of the possible responses of the operating system to a
runtime error. The other possible responses are: error response in the user
program, STOP mode of the CPU.
Error Handling via OB
If the operating system detects a specific error (e.g. an access error in the case
of
STEP 7
), it calls the organization block (error OB) provided for this event that
specifies the subsequent behavior of the CPU.
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