Siemens SIMATIC S7 System Manual page 128

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98BDevice configuration

5.6 Configuring the CPU for communication

All IP addresses are configured when you download the project. If the CPU does not have a

pre-configured IP address, you must associate the project with the MAC address of the

target device. If your CPU is connected to a router on a network, you must also enter the IP

address of the router.

The "Set IP address using a different method" radio button allows you to change the IP

address online or by using the "T_CONFIG (Page 421)" instruction after the program is

downloaded. This IP address assignment method is for the CPU only.

When changing the IP address of a CPU online or from the user program, it is possible to

create a condition in which the PROFINET network may stop.

If the IP address of a CPU is changed to an IP address outside the subnet, the PROFINET

network will lose communication, and all data exchange will stop. User equipment may be

configured to keep running under these conditions. Loss of PROFINET communication may

result in unexpected machine or process operations, causing death, severe personal injury,

or property damage if proper precautions are not taken.

If an IP address must be changed manually, ensure that the new IP address lies within the

IP addresses properties: In

the Properties window,

select the "Ethernet

addresses" configuration

entry. STEP 7 displays the

Ethernet address

configuration dialog, which

associates the software

project with the IP address

of the CPU that will receive

that project.

S7-1200 Programmable controller

System Manual, 11/2011, A5E02486680-05

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