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Entry type: FAQ Entry ID: 63199975, Entry date: 08/27/2012

How do you configure a shared device when you are using a CPx43-1 Advanced as PROFINET IO controller and the GBIT interface of the module is networked?

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With a shared device, multiple IO controllers can access one IO device; for example, you can assign separate modules of an ET 200S to various IO controllers.
For the shared device to function properly for data exchange, the configuration of the use of routers must be identical in the IO controllers. If different routers are configured for the IO controllers, the shared device is not accepted and does not go into data exchange mode.

The following Industrial Ethernet CPs can be used as PROFINET IO controllers:

Industrial Ethernet CP Order number Firmware version
CP443-1 6GK7443-1EX20-0XE0 as from V1.0
CP443-1 6GK7443-1EX30-0XE0 as from V3.0
CP443-1 Advanced 6GK7443-1GX20-0XE0 as of V2.1
CP443-1 Advanced 6GK7443-1GX30-0XE0 as from V3.0
CP343-1 Advanced 6GK7343-1GX30-0XE0 as of V1.2
CP343-1 Advanced 6GK7343-1GX31-0XE0 as from V3.0
Table 01

If you use one of the Industrial Ethernet CPs listed in Table 01 as PROFINET IO controller, then you must note the following when configuring shared devices.

For example, you are using a CP343-1 Advanced as PROFINET IO controller.
The PROFINET interface of the CP343-1 Advanced has the IP address and no router is configured.

Fig. 01

The GBIT interface of CP343-1 Advanced receives the IP address and is networked with another subnet as the PROFINET interface.

Fig. 02

If no router is configured on the PROFINET interface of the CP343-1 Advanced and the GBIT interface is networked, then the IP address of the PROFINET interface is assigned automatically to the IO devices as router.

Fig. 03

Now, if you use the IO device of the CP343-1 Advanced as shared device on another IO controller, it does not go into data exchange mode although there is no router configured on any of the IO controllers.
To get round this behavior you must configure the same router on all the IO controllers of the relevant shared device. For the other IO controllers this can be the PROFINET interface of the CP343-1 Advanced. In this case with the CP343-1 Advanced, there must be no router configured explicitly.

Fig. 04

Additional Information
Detailed information on the topic of PROFINET IO and Shared Device is available in the manual "SIMATIC PROFINET System Description" in Entry ID 19292127.

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