Siemens SIMATIC S7-1200

Communication
11.2 PROFINET
S7-1200 Programmable controller
924 System Manual, V4.2, 09/2016, A5E02486680-AK
11.2.12.3
Assigning Internet Protocol (IP) addresses
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
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 810) for more information.
● You can also assign an IP address to a CPU or network device online. This is particularly
useful in an initial device configuration. Refer to "Assigning an IP address to a CPU
online" (Page 813) for more information.
● After you have configured your CPU or network device in your project, you can configure
parameters for the PROFINET interface, to include its IP address. Refer to "Configuring
an IP address for a CPU in your project" (Page 814) for more information.
11.2.12.4
Configuring the IO cycle time
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.