Siemens IP-Module Manual Pagina 67

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Fundamentals of Positioning IP 266
The IP 266 takes into consideration only a constant acceleration or deceleration
rate for each direction. This results in a linear equation for speed v
(t)
.
v=a
t
The unit for speed is [m/s].
The drive's path is then computed from the speed curve.
In the sections with constant acceleration or deceleration, the path traversed has
a parabolic time characteristic
1
s=
a
t
2
2
In the sections with constant speed, the path is computed as follows:
s=v
t
4.4 IP 266 Modes
In order to compute the setpoint variables S
setp
(t) and V
setp
(t) correctly, the IP 266
requires data which provides a complete description of the drive system.
This data is stored in the module's RAM, and is referred to as machine data.
A mode may be
a sequence of motions
a coordinate shift
a machining program call
A machining program can be stored on the IP 266 to enable automatic execution
of a sequence of motions or special functions (such as dwell or zero offset).
4-8
EWA 4NEB 812 6057-02
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