Siemens SIMATIC ET 200AL System Manual page 1143

Functions
5.6 PROFINET with performance upgrade
3. Select the option "Cable length" or "Signal delay:".
4. Select the cable length or enter the signal delay.
Figure 5-62
Allowing fast forwarding
Requirements:
● The PROFINET IO device has to support the fast forwarding process so that the process
can be used by the device.
● The "Make 'high performance' possible" option is enabled.
● The PROFINET IO interface supports fast forwarding if all the ports except one are
deactivated.
Follow these steps to allow fast forwarding:
1. Select the PROFINET IO system in the network view of STEP 7.
2. In the Inspector window, go to "Properties" > "General" > "PROFINET" > "Domain
management" > "Sync domains" > "Name of the sync domain".
3. Enable the "Allows the use of 'fast forwarding'" option.
Figure 5-63
196
Optimizing port settings for low send clocks
Allowing fast forwarding
PROFINET with STEP 7 V15
Function Manual, 12/2017, A5E03444486-AH