Rules For Setting The Sampling Time - Siemens SINAMICS S120 Function Manual

Basic information about the drive system
12.12 System sampling times
Setting the pulse frequency via p0113 when STARTER is in online mode
The minimum pulse frequency can be entered in p0113. The parameter can only be changed
for p0112 = 0 (Expert). The current controller sampling time (p0115[0]) is set to the inverse
value of twice the minimum pulse frequency. The current controller sampling time (p0115[0])
calculated from the pulse frequency is set in the 1.25 µs time grid.
● Servo:
● Vector:
When commissioning is exited (p0009 = p0010 = 0), the effective pulse frequency (p1800) is
appropriately pre-assigned, depending on p0113, and can be subsequently modified.
Setting the sampling times using p0115
If sampling times are required, which cannot be set using p0112 1, then the sampling times
can be directly set using p0115. To do so, p0112 must be set to 0 (Expert).
If p0115 is changed online, then the values of higher indices are automatically adapted.
We do not recommend that p0115 is changed when STARTER is in the offline mode. The
reason for this is that if the parameterization is incorrect, then the project download is
interrupted.
12.12.3

Rules for setting the sampling time

The following rules apply when setting the sampling times:
1. The current controller sampling times of the drive objects (DOs) and the sampling times
of the inputs/outputs of the Control Unit, TM and TB modules must be a multiple integer
of 1.25 µs.
2. The sampling times (p0115[0] and p4099) of all components that are connected to a
DRIVE-CLiQ line (DQS) must be divisible by one another with an integer result. If the
current controller sampling time on a DO has to be changed to another pattern that does
not match the other DOs on the DQS, the following options are available:
3. The sampling times of the inputs/outputs (4099[0..2]) of a TB30 must be an integer
multiple of the current controller sampling time (p0115[0]) of a drive object connected to a
DRIVE-CLiQ group.
4. When Safety Integrated Extended Functions are used (see Safety Integrated Function
Manual), the sampling time of the current controller (p0115[0]) may be 62.5 μs, 125 μs or
250 μs.
526
When p0113 = 2.0 kHz, p0115[0] is set to 250 µs; when p0113 = 4.0 kHz, p0115[0] is set
to 125 µs.
When p0113 = 1.0 kHz, p0115[0] is set to 500 µs; when p0113 = 2.0 kHz, p0115[0] is set
to 250 µs.
– Change over the DO to another, separate DQS.
– Also change the current controller sampling time and the sampling time of the
inputs/outputs of the DOs not involved so that they again fit into the time grid.
– Sampling time of the inputs/outputs p4099[0..2]: for TB30
Function Manual, (FH1), 07/2007 Edition, 6SL3097-2AB00-0BP4
Drive Functions