Siemens SIMATIC S7-1500 Function Manual page 18

Introduction
2.2 Principle of operation of S7-1500 Motion Control
●
The synchronous axis technology object ("TO_SynchronousAxis") includes all functions of
the positioning axis technology object. You can also interconnect the axis with a master
value so that the axis follows the position change of a leading axis in synchronous
operation.
●
The external encoder technology object ("TO_ExternalEncoder") detects a position, and
makes it available to the controller. The detected position can be evaluated in the user
program.
Technology data block
The properties of real objects are configured by means of the technology objects and saved
in a technology data block. The technology data block contains all configuration data,
setpoint and actual values, and status information of the technology object. The TIA Portal
automatically creates the technology data block when the technology object is created. You
access the data of the technology data block with your user program.
Motion Control instructions
With the Motion Control instructions you perform the desired functionality in the technology
objects. The Motion Control instructions are available in the TIA Portal under "Instructions >
Technology > Motion Control > S7-1500 Motion Control".
The Motion Control instructions conform to PLCopen (version 2.0).
User program
The Motion Control instructions and the technology data block represent the programming
interfaces for the technology objects. Use the Motion Control instructions to start Motion
Control jobs at technology objects in your user program. You track the status of running jobs
with the output parameters of the Motion Control instructions. You access status information
of the technology object with the technology data block and change specific configuration
parameters during runtime.
18
Synchronous axis technology object
External encoder technology object
S7-1500 Motion Control V13 Update 3
Function Manual, 07/2014, A5E03879256-AC