ET 100U Preface
Preface
The ET 100U Electronic Terminator for distributed I/O is the modular process-
oriented and machine-oriented I/O level for the S5-115U, S5-135U, S5-150U and
S5-155U programmable controllers. The ET 100U enables you on the one hand
to digitize physical sensor signals in the vicinity of the process and to transfer
them to the central controller, and, on the other hand, to send digital output
information to the ET 100U and convert it into control currents or voltages for
the actuators in the process.
The performance capability of the ET 100U has been constantly increasing.
This has made it necessary to revise the manual. At the same time, we have
attempted to meet demands for higher quality in technical documentation,
which means:
• Standardization of terminology
• More detailed breakdown of subjects
• Illustration of individual problems
• User-friendly arrangement of the contents
However, the applications are so numerous that not all the problems which
might occur can be dealt with in one manual. Should any problems arise that
are not handled in this manual, please ask your Siemens representative for
advice or send us the correction and suggestions form which you will find at the
end of the manual.
EWA 4NEB 812 6040-02a V-1
