Axis Types; Modulo Setting - Siemens SIMATIC S7-1500 Function Manual

Basics

3.7 Axis types

3.7 Axis types
Axes can be configured with different axis types:
● Positioning and synchronous axes can be configured as rotary or linear axis.
● Speed axes are always rotary axes.
Depending on the execution of the mechanics, an axis is implemented as a linear axis or
rotary axis:
● Linear axis
For linear axes, the position of the axis is specified as a linear measure,
e.g. millimeters (mm).
● Rotary axis
For rotary axes, the position of the axis is specified as an angular measure,
e.g. degrees (°).
3.8

Modulo setting

The positioning axis, synchronous axis and external encoder technology objects can be
enabled with the "Modulo" setting.
If an axis is moved in only one direction, the position value continually increases. To limit the
position value to a recurring reference system, you can enable the "Modulo" setting.
When "modulo" is enabled, the position value of the technology object is represented by
means of a recurring modulo range. The modulo range is defined by the start value and the
length.
For example, to limit the position value of a rotary axis to a full rotation, the modulo range
can be defined with start value = 0° and length = 360°. With an encoder resolution of
0.1°/encoder step, the position value is represented in the modulo range 0° to 359.9°.
26
S7-1500 Motion Control V13 Update 3
Function Manual, 07/2014, A5E03879256-AC