System Rules, Sampling Times And Drive-Cliq Wiring; Overview Of System Limits And System Utilization - Siemens Sinamics S120 Comissioning Manual

A.4

System rules, sampling times and DRIVE-CLiQ wiring

A.4.1

Overview of system limits and system utilization

The number and type of controlled axes, infeeds and Terminal Modules as well as the
additionally activated functions can be scaled by configuring the firmware.
The software and control functions available in the system are executed cyclically with
different sampling times (p0115, p0799, p4099). These sampling times are automatically
pre-assigned when configuring the drive (see Section Default setting (Page 208)). They can
be subsequently adapted by the user.
The number of controllable drives, infeeds and Terminal Modules that can be operated with
the selected Control Unit depends on some system rules, the set sampling times, the control
mode and the activated additional functions.
There are also still dependencies and rules for the components used and the selected
DRIVE-CLiQ wiring.
The existing rules are described in greater detail in the following sub-sections. After this
there are notes on the number of controllable drives and some example topologies.
The following standard quantity structures are operable with standard clock cycles:
● 12 V/f control axes with 500 µs
● 6 vector axes with 500 µs
● 6 servo axes with 125 μs
● 3 vector axes with 250 μs
● 3 servo axes with 62.5 μs
● 1 servo axis with 31.25 μs (single-axis module)
Consequently, the conversion of an axis from 125 µs to 62.5 µs normally leads to the loss of
an axis. This rule can also be used for the clock-cycle mixing to achieve a general estimate
of the quantity structure.
Especially for demanding configurations, drives with high dynamic response or a large
number of axes with additional utilization of special functions for example, a check using the
SIZER engineering tool is recommended. The SIZER engineering tool calculates the
feasibility of the project.
Finally, the utilization flag in r9976 indicates whether a topology is operable. If the utilization
exceeds 100%, this is indicated with fault F01054. In this case, one or more axes must be
dispensed with or the function scope reduced.
Commissioning with Startdrive
Commissioning Manual, (IH3), 07/2016, 6SL3097-4AA10-0BP0
A.4 System rules, sampling times and DRIVE-CLiQ wiring
Appendix
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