Siemens IP-Module Manual Pagina 64

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IP 266 Fundamentals of Positioning
I/O
The term "I/O" is used collectively for all other auxiliary facilities.
The most important of these are
- the limit switches used to limit the traversing range
- the programmer used in conjunction with the COM 266 software to service
the IP 266.
4.3 Terms
4.3.1 Positioning
Positioning means bringing a load to a defined position within a specific period
of time, making allowance for force and torque.
Figure 4-5. Principles of Positioning
Position BPosition A
s
F
x
x = Distance to be travelled F = Driving force
4.3.2 Setpoint, Actual Value and Following Error
Execution of a positioning operation requires specification of
the target coordinate
acceleration and deceleration rates
positioning velocities.
Based on this data, the IP 266 computes a theoretical speed characteristic. An
ideal drive system would directly follow this characteristic. The IP 266 provides a
voltage value at its analog output which is proportional to the theoretical speed
characteristic. This value is referred to as the setpoint, and is computed by the
IP 266's setpoint generator.
EWA 4NEB 812 6057-02
4-5
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