Efficient Networks S120 manual Replacing Control Unit CU320 IO Device, Definition Sub-network mask

Communication PROFIBUS DP/PROFINET IO 10.3 Communications via PROFINET IO

NOTICE

The device name must be saved in a non-volatile fashion either using the Primary Setup Tool (PST) or using HW Config from STEP 7.

Replacing Control Unit CU320 (IO Device)

If the IP address and device name are stored in a non-volatile memory, this data is also forwarded with the memory card (CF card) of the Control Unit.

If an IO device must be completely replaced due to a device or module defect, the Control Unit automatically assigns parameters and configures the new device or module. Following this, cyclic exchange of user data is restarted. The CF card allows module exchange without an IO supervisor when a fault occurs in a PROFINET device.

Definition: Sub-network mask

The bits set in the sub-network define the part of the IP address that contains the address of the (sub-) network. The following generally applies:

●The network address is obtained by an AND operation on the IP address and sub- network mask

●The node address is obtained by an AND NOT operation on the IP address and sub- network mask.

Example of the sub-network mask

Sub-network mask: 255.255.0.0 (decimal) = 11111111.11111111.00000000.00000000

(binary) IP address: 140.80.0.2 significance: The first 2 bytes of the IP address decide the sub-network - in other words 140.80. The last two bytes address the node - in other words 0.2.

Default router

If data needs to be forwarded by means of TCP/IP to a partner located outside the sub- network, this is carried out via the default router. In the properties dialog in STEP 7 (Properties of Ethernet interface > Parameters > Network transfer), the default router is described as the router. STEP 7 assigns the local IP address to the default router.

10.3.1.4Data transfer

Features

The Communication Board CBE20 supports:

●IRT – isochronous real-time Ethernet

●RT – real-time Ethernet

●Standard Ethernet services (TCP/IP, LLDP, UDP and DCP)

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	Function Manual, (FH1), 07/2007 Edition, 6SL3097-2AB00-0BP4