OSI-H1 Connect Parameters

In this dialog box, you can edit the OSI-H1 parameters.

Name of the Connection

You can choose any connection name you like. All characters except brackets may be used.

Adapter

Here, you can specify the name of the Ethernet adapter used to establish the H1 connection.

Destination MAC

Each Ethernet station is addressed using a unique MAC address (also referred to as Ethernet address or hardware address). Enter the Ethernet address of the destination station here. The destination address consists of 6 bytes (to be entered in hexadecimal notation).

NOTE:

In a single network, each station must have a unique Ethernet address.

Own TSAP, Dest TSAP

TSAPs (Transport Service Access Points) are addresses that are used on the transport layer in order to address applications. To connect, enter the local TSAP into the Own TSAP field and the TSAP of the communication partner into the Dest TSAP field. In this context, please note the following:

NOTE:

In order to be able to establish the connection, the value in the Own TSAP field of one system must match the Dest TSAP value in the other system, i.e. they must match crosswise.

More detailed information on TSAPs

TSAPs for S7 Connections

CR Parameters

With OSI (H1) connections, a transport connection is established. For this purpose, an active transport instance sends a CR TPDU (Connection Request Transport Protocol Data Unit) signaling that it wants to connect. This CR TPDU is used to send some parameters to the partner, such as the desired TPDU size, the TPDU format, and others. Since there is no standard CR parameter definition, please refer to the operating instructions of the destination system to find out which parameters you need to specify here, if any. If no information is available, do not enter any CR parameters.

Type (active / passive)

Here, you can specify whether your own station will actively initiate the connection attempt or wait passively for the partner station to establish the connection. Please make sure that different values are selected on both sides of the connection. Usually, the PC will be parameterized as active. This is the default.

Protocol

Using this option, you can specify whether frames on this connection will go to all devices (Broadcast), whether a certain group of stations should be addressed (Multicast), whether a secured connection will be used (Normal) or whether the data will be transmitted via an unsecured connection (Datagram). Usually, you select “Normal” here.

Priority

The line priority can range from 0 (highest priority) to 4 (lowest priority). 0 and 1 are so-called express priorities, 2 and 3 are normal priorities. Priority 4 is only used on rare occasions because it causes the connection to be reestablished for each send transaction. On the other hand, if it is only used intermittently, it puts less load on the network than the other priorities because the line will not be monitored (the connection is closed after each send transaction). Please note that when using express priorities, the transmission will not be faster than with normal priorities. For some PLCs, however, the data will be transferred to the RAM using an interrupt if you select priority 0. This may result in a faster overall data transmission. For priorities 0 and 1, the maximum data length is 16 bytes. Usually, Prio 3 is used here.