Frequency Generation - Siemens SIMATIC FM 353 Manual

9.7.1

Frequency generation

Function parameters
The following table shows you which parameters to use in matching frequency
generation to the selected stepper drive.
MD
39 Start/Stop frequency (f
40 Frequency value for accelera-
tion switchover (f
41 Maximum frequency (f
42 Acceleration 1 (a
43 Acceleration 2 (a
44 Deceleration 1 (a
45 Deceleration 2 (a
46 Minimum idle time between
two positioning cycles (t
47 Minimum traversing time at
constant frequency (t
1) see Section 5.3.1, Dependencies
Frequency profile
In controlling speed, special importance is attached to the drive-specific require-
ments regarding the shape of the frequency/time function. Based on this, a discon-
tinuous traversing movement is initiated or stopped below the Start/Stop frequency.
For higher traversing velocities, a ramp-shaped control cycle, which builds on the
Start/Stop frequency, takes place within two velocity ranges with acceleration val-
ues of different parameterization capability .
The following illustrations provide you with examples of frequency profiles for se-
lected traversing movements.
Maximum speed frequency profile
f
f
max
f
eg
f
ss
Fig. 9-7
FM 353 Stepper Drive Positioning Module
6ES7 353-1AH01-8BG0
Designation
)
ss
1)
)
eg
)
max
1)
)
b1
1)
)
b2
1)
)
v1
1)
)
v2
)
st
)
vk
a
b2
a
b1
Maximum speed frequency profile
Description of Functions
Value/Meaning
10 − 10,000
500 − 75,000
Minimum value: MD39
Maximum value: MD41
500 − 200,000
10 − 10,000,000
10 − MD42, 0 as with MD42
10 − 10,000,000, 0 = as with
MD42
10 − MD44, 0 = as with
MD43
1 − 10,000
1 − 10,000
a
v2
a
v1
Unit
[Hz]
[Hz]
[Hz]
[Hz/sec]
[Hz/sec]
[Hz/sec]
[Hz/sec]
[ms]
[ms]
t
9-69