Technical data

CPU 317T: Technology Functions
A5E00251798-03
vii
Contents
1 What's new in S7-Technology V2.0 1-1
2 Application and usage 2-1
2.1 Compact and integrated....................................................................................2-1
2.2 The familiar "SIMATIC world"............................................................................2-1
2.3 Integrated PLCopen-compliant motion control functions in STEP 7.................2-2
2.4 Available components and systems..................................................................2-2
2.5 Project data volume and operating conditions..................................................2-5
2.6 Components and their tasks .............................................................................2-6
2.6.1 Hardware components ......................................................................................2-6
2.6.2 Engineering tools ..............................................................................................2-7
2.6.3 Technology functions and technology DBs.....................................................2-10
3 Technology objects 3-1
3.1 Axes - Basics ....................................................................................................3-1
3.1.1 Axis technologies ..............................................................................................3-1
3.1.2 Axis types..........................................................................................................3-3
3.1.3 Physical and virtual axes...................................................................................3-4
3.1.4 "Axis" - "drive" difference ..................................................................................3-5
3.1.5 Dynamic Servo Control (DSC) ..........................................................................3-6
3.1.6 Homing..............................................................................................................3-8
3.1.7 Absolute encoder adjustment .........................................................................3-10
3.1.8 Data set changeover .......................................................................................3-11
3.2 "Velocity-controlled axis" technology object....................................................3-12
3.3 "Positioning axis" technology object ...............................................................3-13
3.3.1 Block diagram: Positioning axis with position control .....................................3-14
3.4 "Synchronization axis" technology object .......................................................3-15
3.4.1 Structure of the "Synchronization axis" technology object..............................3-16
3.4.2 Synchronization compound.............................................................................3-16
3.4.3 Gearing............................................................................................................3-20
3.4.4 Camming.........................................................................................................3-22
3.4.5 Superimposing synchronism...........................................................................3-26
3.5 "Cam disk" technology object..........................................................................3-28
3.5.1 Normalization ..................................................................................................3-29
3.5.2 Using a cam disk.............................................................................................3-30
3.5.3 Scaling and Offset...........................................................................................3-31
3.5.4 Interpolation ....................................................................................................3-31
3.6 "Output Cam" technology object .....................................................................3-33
3.6.1 Position-based cam.........................................................................................3-35
3.6.2 Switching cams ...............................................................................................3-37
3.6.3 Time-based cam .............................................................................................3-38
3.6.4 Response, effective direction..........................................................................3-39
3.6.5 Hysteresis........................................................................................................3-41
3.6.6 Derivative-action times....................................................................................3-42
3.6.7 Example of an electronic cam control.............................................................3-43