Siemens SIMATIC S7 System Manual page 439
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Assigning the IP addresses
In a PROFINET network, each device must also have an Internet Protocol (IP) address. This
address allows the device to deliver data on a more complex, routed network:
● If you have programming or other network devices that use an on-board adapter card
● You can also assign an IP address to a CPU or network device online. This is particularly
● After you have configured your CPU or network device in your project, you can configure
Configuring the IO cycle time
A PROFINET IO device is supplied with new data from the CPU within an "IO cycle" time
period. The update time can be separately configured for each device and determines the
time interval in which data is transmitted from the CPU to and from the device.
STEP 7 calculates the "IO cycle" update time automatically in the default setting for each
device of the PROFINET network, taking into account the volume of data to be exchanged
and the number of devices assigned to this controller. If you do not want to have the update
time calculated automatically, you can change this setting.
You specify the "IO cycle" parameters in the "Properties" configuration dialog of the
PROFINET IO device. This dialog appears near the bottom of the page whenever you have
selected any part of the instruction.
In the "Device view" of the PROFINET IO device, click the PROFINET port. In the
"PROFINET Interface" dialog, access the "IO cycle" parameters with the following menu
selections:
● "Advanced options"
● "Realtime settings"
● "IO cycle"
Define the IO cycle "Update time" with the following selections:
● To have a suitable update time calculated automatically, select "Automatic".
● To set the update yourself, select "Can be set" and enter the required update time in ms.
● To ensure consistency between the send clock and the update time, activate the "Adapt
S7-1200 Programmable controller
System Manual, 11/2011, A5E02486680-05
connected to your plant LAN or an Ethernet-to-USB adapter card connected to an
isolated network, you must assign IP addresses to them. Refer to "Assigning IP
addresses to programming and network devices" (Page 123) for more information.
useful in an initial device configuration. Refer to "Assigning an IP address to a CPU
online" (Page 125) for more information.
parameters for the PROFINET interface, to include its IP address. Refer to "Configuring
an IP address for a CPU in your project" (Page 127) for more information.
update time when send clock changes" option. This option ensures that the update time
is not set to less than the send clock.
103BCommunication
10.2 PROFINET
439
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