Actual Values; Brief Description; Incremental Actual Value; Absolute Actual Value - Siemens SIMATIC S7-1500 Function Manual
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Also See for SIMATIC S7-1500:
- System manual (523 pages) ,
- Function manual (362 pages) ,
- Manual (188 pages)
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3.12
Actual values
3.12.1
Brief description
For position-controlled motion and positioning, the controller must know the actual position
value.
The actual position value is provided by a PROFIdrive frame. The actual value is updated
after a one-off transition of the operating mode from STOP to RUN.
The actual values are represented incrementally or absolutely in the PROFIdrive frame, and
standardized in the controller to the technological unit. Homing is used to convert the actual
value to the physical position of the axis, or of the external encoder.
The controller supports the following types of actual values:
● Incremental actual value
● Absolute actual value with the setting absolute (measuring range > traversing range of
● Absolute actual value with the setting absolute (measuring range < traversing range of
3.12.2
Incremental actual value
The actual value in the PROFIdrive frame is based on an incremental value.
After POWER ON, position zero is displayed. The actual value is updated after a one-time
transition of the operating mode from STOP to RUN in the STOP and RUN operating modes.
The relationship between the technology object and the mechanical position must be
recreated by means of homing (Page 39).
3.12.3
Absolute actual value
The actual value in the PROFIdrive frame is based on an absolute value.
After POWER ON, position zero is displayed. The actual value is updated after a one-off
transition of the operating mode from STOP to RUN. The supplied absolute value is
assigned to the associated mechanical axis position by means of absolute value adjustment
(Page 56). The absolute value adjustment must be performed once. The absolute value
offset is retentively saved beyond the switching on/off of the controller.
Differentiation of absolute values:
● The measuring range of the encoder is larger than the traversing range of the axis:
● The measuring range of the encoder is smaller than the traversing range of the axis:
S7-1500 Motion Control V13 Update 3
Function Manual, 07/2014, A5E03879256-AC
the axis)
the axis)
Absolute value with absolute setting
Absolute value with cyclically absolute setting
Basics
3.12 Actual values
35
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