Siemens SIMATIC S7-1500T - 4 External Encoder Technology Object; General Information; Fields of Application

4 "External Encoder” Technology Object
4.1 General information
TOs of S7-1500(T)
Entry ID: 109743134, V1.0, 05/2017
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 Siemens AG 2017 All rights reserved
4 "External Encoder” Technology Object
4.1 General information
The external encoder technology object present an incremental or absolute value
encoder for position detection, which is equipped with a PROFINET interface and
can therefore directly exchange data with the SIMATIC controller.
Alternatively, a module of the ET 200SP or ET 200MP distributed I/O system for
position detection, such as TM Count or TM PosInput could also be used here,
which can communicate with the SIMATIC controller in accordance with the
PROFIdrive standard.
Figure 4-1 "External encoder” technology object
The following motion control instructions can be used together with the external
encoder:
 "MC_Power”
Switching on or enabling the external encoder.
 "MC_Reset”
Acknowledging the pending error and warning messages on the external
encoder.
 "MC_Home”
Passive or direct homing of the external encoder in the coordinate system.
4.2 Fields of application
The external encoder technology object is used for applications where motions
have to be detected in the SIMATIC controller that are not directly influenced by
this controller or where a slip is to be expected between drive axle and product or
material.
The technology object determines the following current parameters of the recorded
motion:
 Current position
 Current speed (internally calculated from the current position)
 Current acceleration (internally calculated from the current position)