Glossary
Glossary-5
ET 200S Interface Module IM 151/CPU
A5E00058783-01
Error Response
Response to a runtime error. The operating system can respond in the
following ways: conversion of the programmable controller to STOP mode, call of
an organization block in which the user can program a response, or display of
the error.
ET 200
The ET 200 distributed I/O system with the PROFIBUS-DP protocol is a bus for
connecting distributed I/O devices to a CPU or an appropriate DP master. The
ET 200 is notable for its fast response times, since only a small amount of data
(bytes) is transferred.
The ET 200 is based on IEC 61158/EN 50170, Volume 2, PROFIBUS.
The ET 200 works on the master/slave principle. Examples of DP masters are
the IM 308-C master interface module and the CPU 315-2 DP.
DP slaves can be the distributed I/O devices ET 200S, ET 200B, ET 200C,
ET 200M, ET 200X, ET 200U, ET 200L or DP slaves from Siemens or other
vendors.
FC Function
Force
During commissioning, for example, the “Force” function allows certain outputs to
be set to “ON” for any length of time, even if the logic operations of the user
program are not fulfilled (e.g. because inputs are not wired).
FREEZE
This is a control command of the DP master to a group of DP slaves.
When a DP slave receives the FREEZE control command, it freezes the current
status of the inputs and transfers them cyclically to the DP master.
After each FREEZE control command, the DP slave freezes the status of the
inputs again.
The input data is not transferred from the DP slave to the DP master again
cyclically until the DP master sends the UNFREEZE control command.
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