Siemens SIMATIC NET Podręcznik Użytkownika Pobierz pdf (Strona 6)

2 Wonderware Siemens SIMATIC NET S7 I/O Server

SuiteLink uses a TCP/IP based protocol and is designed specifically to meet industrial

needs such as data integrity, high-throughput, and easier diagnostics. This protocol

standard is only supported on Microsoft Windows NT 4.0 and Windows 2000.

SuiteLink is not a replacement for DDE, FastDDE, or NetDDE. The protocol used

between a client and a server depends on your network connections and configurations.

SuiteLink was designed to be the industrial data network distribution standard and

provides the following features:

• Value Time Quality (VTQ) places a time stamp and quality indicator on all data

values delivered to VTQ-aware clients.

• Extensive diagnostics of the data throughput, server loading, computer resource

consumption, and network transport are made accessible through the Microsoft

Windows NT and Windows 2000 operating systems Performance Monitor. This

feature is critical for the scheme and maintenance of distributed industrial networks.

• Consistent high data volumes can be maintained between applications regardless if

the applications are on a single node or distributed over a large node count.

• The network transport protocol is TCP/IP using Microsoft’s standard WinSock

interface.

Accessing Remote Items via the I/O Server

The communication protocol addresses an element of data in a conversation that uses a

three-part naming convention that includes the application name, topic name and item

name. The following briefly describes each portion of this naming convention:

application name The name of the Windows program (server) that will be accessing

the data element. In the case of data coming from or going to

Siemens equipment via this server, the application portion of the

address is S7.

topic name Meaningful names are configured in the server to identify specific

devices. These names are then used as the topic name in all

conversations to that device. For example, S7PLC400.

Note You can define multiple topic names for the same device

(PLC) to poll different points at different rates.

item name A specific data element within the specified topic. For example,

when using this server, an item can be a relay, timer, counter,

Note The item/point names are predefined by the server. The

term "point" is used interchangeably with the term "item" in this

user's guide.

$ For more information on item/point names, see the "Item

Names" section in this user's guide.

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Siemens SIMATIC NET Podręcznik Użytkownika Strona 6