Siemens Simatic S7 Series

Program instructions
7.7 Pulse output
S7-200 SMART
258 System Manual, 09/2015, A5E03822230-AC
The acceleration (or deceleration) and time duration of a given PTO profile segment can be
useful in the process of determining correct profile table values. Use the following formulas
to calculate the length of time, as well as the acceleration for a given profile:
ΔF = F
Final
- F
Initial
T
s
= PC / (F
min
+ ( | ΔF | / 2 ) )
A
s
= ΔF / T
s
where:
T
s
Time duration (s) of this segment
A
s
Frequency acceleration (Hz/s) of this segment
PC
Quantity of pulses in this segment
F
min
Minimum frequency (Hz) for this segment
ΔF
Delta (total change in) frequency (Hz) for this segment