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    • "Class E" addresses: 240.0.0.0 - 247.255.255.255

    • Broadcast addresses: e.g. 255.255.255.255

    4.2.2 Subnet mask

    If a subnet mask is specified during configuration, its structure must comply with

    the general conventions defining subnet mask validity.

    Please note that the validity of an IP address and an associated subnet mask are

    interdependent.

    4.2.3 TSAPs

    The TSAPs consist of 2 bytes. The first byte specifies the connection and the second

    byte is composed of the rack number and the position of the communications

    module. The following value ranges apply for the first byte.

    • Local TSAP value range: 16#02, 16#10 - 16#FE

    • Remote TSAP value range: 16#02, 16#03, 16#10 - 16#FE

    The structure of the second byte is not checked by the CP 243-1.

    Defining the address of the control byte and the number of connections

    Use the next dialog to specify the address of the byte in the memory address

    space of your S7-200 system from which the CP 243-1 can be addressed from the

    S7-200 CPU. This address depends on the position of the CP 243-1 in your

    S7-200 system and on the number of outputs in your S7-200 system. If, when you

    began configuring the system, you had the Ethernet Wizard determine the position

    of the CP 243-1 in your S7-200 system, the Wizard will now provide you with the

    address to be used.

    Basically, you can determine the memory address spaces occupied by the modules

    present in your S7-200 system by enabling the "Information..." entry in the

    "PLC" menu in STEP 7 Micro/WIN 32. In this manner you will also find the address

    under which your CP 243-1 can be addressed in your S7-200 system.

    In this dialog, you can also define the maximum number of connections your

    CP 243-1 should maintain in parallel at any one time. Up to 8 such connections can

    be maintained. A dialog in which you can configure the connection then appears

    for each connection you specify here.

    Configuring the inpidual connections

    The connections that you established in the previous dialog are configured in the

    dialogs that follow. For each connection, you must first define whether your S7-200

    system should be operated as a client or server. This will determine the structure of

    the dialog.

    If your S7-200 system is to be operated on the connection as a client, then you

    must specify the address of the communication partner and the communications

    end point ("TSAP") in this partner. Moreover, in an additional dialog, you must

    specify which data is to be exchanged between your S7-200 system and the specified

    communication partner. At this point you also define whether these data is to

    be read or written. Up to 32 read/write commands can be defined per connection.

    If your S7-200 system is operated on the connection as a server, then you can define

    to which communication partner you wish to grant access to your system by

    assigning an IP address. However, you can also set each server so that it always

    grants access from any IP address. You must also define the communications end

    point ("TSAP") in your communication partner from which you grant access to your

    S7-200 system.

    A Keep Alive system can be enabled for both client and server connections.

    Please use the communications end points ("TSAPs") of your communication partner

    specified in the configuration of that partner. In an S7-200 system, it is generated

    using STEP 7 Micro/WIN 32. In an S7-300, S7-400 or OPC-based system,

    use STEP 7 to do so (see also Chapter 4.4).

    Note

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