Setting the send cycle clock in HW Config
The send cycle clock for PROFINET IO must be set in the "Domain Management" dialog in
HW Config. To do this, select the "Edit" > "PROFINET IO" > "Domain management ..." menu
command in HW Config and set the desired cycle clock.
The PROFINET interface can be operated with a send cycle clock in the range of 0.25 ms ≤
send cycle clock ≤ 4 ms when one servo is used. The smallest configurable time base is 0.125
ms.
Note
Information for version < V4.4
If there are IO devices with RT class "RT" in a sync domain, it is only possible to set the send
cycle clocks 0.25 ms, 0.5 ms, 1 ms, 2 ms and 4 ms.
Cycle clock reduction ratio
As of V4.3, a reduction ratio for the PROFIBUS cycle clock to the Servo cycle clock is possible.
The reduction ratio is only permitted when PROFINET IO with IRT has not been configured.
A reduction ratio for the PROFINET send cycle clock to the PROFIBUS cycle clock is also
possible.
Example:
PROFINET send cycle clock = 0.5 ms
PROFIBUS cycle clock = servo cycle clock = 1 ms
The PROFIBUS cycle clock can be operated relative to the PROFINET send cycle clock at a
ratio of 1:1 to 16:1.
The table below shows the possible ratio settings for the SIMOTION D4x5‑2 system cycle
clocks based on the DP cycle of the SINAMICS Integrated or PROFINET send cycle clock.
Table 6-6
Ratios of the system cycle clock (when one servo is used)
Cycle clock name
Settable factors
Reference cycle clock
PROFIBUS DP
bus cycle clock
1, 2, 3, 4, 6, 8, 10, 12, 14, 16
PROFINET IO send cycle clock
Servo
As of V4.3: 1, 2, 3, 4, 8
1)
V4.2: 1
PROFIBUS DP bus cycle clock
IPO
1, 2, 3, 4, 5, 6
Servo
IPO_2
2, 3, 4, 5, …, 64
IPO
1)
Always "1" if PROFINET with IRT has been configured
Setting the cycle clock ratios
The set bus cycle clock is displayed in SIMOTION SCOUT as the "Bus data cycle" in the
"System Cycle Clocks - D4x5‑2" dialog box. Select SIMOTION D4x5‑2 and then select the
"Set system cycle clocks" command from the "Target system" > "Expert" menu.
Set the required cycle clock ratios for the servo, IPO and IPO_2 in the "System Cycle Clocks
- D4x5‑2" dialog box.
Parameter assignment / addressing
6.5 Configuring PROFINET IO
SIMOTION D4x5-2
Commissioning and Hardware Installation Manual, 03/2018, A5E33441636B
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