Understanding The Rp Seek Modes Supported By The Position Module - Siemens SIMATIC S7-200 System Manual

Understanding the RP Seek Modes Supported by the Position
Module
The following figures provide diagrams of the different options for each RP seek mode.
Figure 9-21 shows two of the options for RP seek mode 1. This mode locates the RP
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where the RPS input goes active on the approach from the work zone side.
Figure 9-22 shows two of the options for RP seek mode 2. This mode locates the RP in the
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center within the active region of the RPS input.
Figure 9-23 shows two of the options for RP seek mode 3. This mode locates the RP a
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specified number of zero pulses (ZP) outside the active region of the RPS input.
Figure 9-24 shows two of the options for RP seek mode 4. This mode locates the RP a
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specified number of zero pulses (ZP) within the active region of the RPS input.
For each mode, there are four combinations of RP Seek direction and RP Approach direction.
(Only two of the combinations are shown.) These combinations determine the pattern for the RP
seek operation. For each of the combinations, there are also four different starting points:
The work zones for each diagram have been located so that moving from the reference point to
the work zone requires movement in the same direction as the RP Approach Direction. By
selecting the location of the work zone in this way, all the backlash of the mechanical gearing
system is removed for the first move to the work zone after a reference point seek.
Default configuration :
RP Seek Direction: Negative
RP Approach Direction: Positive
Positive motion
Negative motion
RP Seek Direction: Positive
RP Approach Direction: Positive
Positive motion
Negative motion
Figure 9-21 RP Seek Mode 1
Open Loop Motion Control with the S7-200
LMT- - RPS Active
Active
RPS Active
RP
RP
Work Zone
Work Zone
Chapter 9
LMT+
Active
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