Setting The Dp Cycle And System Cycle Clocks - Siemens SIMOTION D410 Series Commissioning Manual

Configuring SIMOTION D410
3.3 Configuring the PROFIBUS DP interface (only D410 DP)
3.3.5

Setting the DP cycle and system cycle clocks

All system clocks for SIMOTION D410 DP are based on the DP cycle of SINAMICS
Integrated, which must be set in HW Config.
In HW Config, double-click the SINAMICS drive at the integrated PROFIBUS. The "DP Slave
Properties" dialog box opens. You can synchronize the DP cycle of SINAMICS Integrated in
the "Isochronous mode" tab.
Table 3- 1
DP cycle
Grid
The PROFIBUS DP interface of the SIMOTION D410 DP supports operation at a DP cycle
time ≥ 1 ms, at a resolution of 0.125 ms. SINAMICS Integrated always runs in isochronous
mode. The cyclic tasks of SIMOTION are therefore always in synchronism with
SINAMICS Integrated.
The set DP cycle of SINAMICS Integrated is displayed as "Bus cycle" in the "System Clocks
- D410..." dialog box in SIMOTION SCOUT. Select the SIMOTION D410 DP in the project
tree, and then select the "Set system clocks" option in the "Target system" > "Expert" menu.
The table below shows the ratios you can set for the system clocks of SIMOTION D410 DP
based on the DP cycle.
Table 3- 2
Servo cycle: Bus cycle
1 to 4, 8
The minimum servo cycle length that can be set is 2 ms.
If you programmed the PROFIBUS DP interface for operation in isochronous master mode,
you must synchronize its DP cycle with the DP cycle of SINAMICS Integrated in HW Config.
The timebase for the system clocks is generated internally if the DP interface is operated in
isochronous or non-isochronous master mode. SIMOTION D410 does not have to
synchronize itself with an external cycle.
The PROFIBUS DP interface can also be operated in isochronous slave mode. In this
constellation system clocks are based on the clock signals received at the slave interface. A
substitute clock of a duration equivalent to the configured clock is generated internally if the
isochronous slave interface has not received a clock signal.
The clock settings are included in the project download to SIMOTION D410 DP and are
adjusted according to specification.
At a PROFIBUS DP interface operated in isochronous slave mode you can also step down
the clock ratio for synchronization with SINAMICS Integrated. This reduction of the clock
ratio at the isochronous slave interface for synchronization with SINAMICS Integrated allows
the operation of a DP cycle at the slave interface which is equivalent to an integer multiple
SINAMICS Integrated. This reduction can be set up by setting an integer multiple of the
SINAMICS Integrated DP cycle as the DP cycle for the DP interface (X21) in HW Config.
The rule is checked in HW Config.
46
Range of values for SIMOTION D410 DP
Possible factors between the system cycle clocks
≥ 1 ms
0.125 ms
IPO cycle: Servo cycle
1 to 6
IPO2 cycle: IPO cycle
2 to 64
D410
Commissioning Manual, 05/2009