Optimized Motion Profile - Siemens SIMATIC FM 353 Manual

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7.3.8

Optimized motion profile

Positioning operations for short travels programmed in conjunction with the para-
meterization of relatively high accelerations (MD42...MD45) are performed within a
few FM cycles.
In previous software versions, positioning times can occur which do not comply
with the times calculated, but are considerably higher (depending on the path
length programmed). When reducing the distance to be traversed, e.g. by a path
corresponding to one step of the stepper motor, the following effect can occur: The
positioning time is not reduced or remains unchanged, but the positioning can last
longer by several FM cycles.
The possibility of mispositioning should not be excluded in conjunction with the
causes for this behavior, even though such error messages had not been reported
by now.
In the present software version, the functioning principle of the FM 353 can be
switched to the "Optimized motion profile" mode.
MD56 Optimized motion profile (see Table 5-4)
Note
MD56 is zero ("0") by default. Thus, the default motion profile is activated; the
functioning principle is the same as in the previous software versions.
No value monitoring with output of error messages is provided when entering
MD56. In case of an illegal or invalid value assignment, the default motion com-
mand is activated.
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FM 353 Stepper Drive Positioning Module
6ES7 353-1AH01-8BG0
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