Echelon SmartServer 2.2 Instrukcja Użytkownika Pobierz pdf (Strona 269)

270 Using the SmartServer as Network Management Tool

This property is only displayed in Driver mode; it is not displayed

in General mode.

Note: The actual poll rate for a data point is determined by

calculating the greatest common devisor of all the poll rates set for

the data point in the applications to which it has been added.

For example, if a Data Logger polls a data point every 5 seconds,

and an Alarm Generator polls the same data point every 7 seconds,

the SmartServer’s internal data server will poll the data point every

1 second.

Therefore, set poll rates in the SmartServer’s applications that are

the same for a given data point, or poll rates that are at least

multiples of each other.

For example, if a Data Logger polls a data point every 5 seconds,

and an Alarm Generator polls the same data point every 10 seconds,

the SmartServer’s internal data server will poll the data point every

5 seconds.

6. Click Submit to save any changes.

Connecting LONWORKS Data Points with LONWORKS Connections

You can create LONWORKS connections in the SmartServer tree or OpenLNS tree to bind the network

variables of LONWORKS devices that are in the same network. Creating LONWORKS connections with

the SmartServer is comparable to creating connections with OpenLNS CT. You select a hub network

variable in the OpenLNS tree and then select one or compatible target network variables in the same

network. Network variables must have the same type to be compatible. Once you create LONWORKS

connection, the target data points will receive all updates from the hub (source) in the connection. This

process of connecting network variables is called binding, and the logical connections are thought of as

virtual wires.

LONWORKS connections created with the SmartServer always use Subnet/Node ID addressing. You

can use an OpenLNS application such as OpenLNS CT to select a different addressing mode such as

group or broadcast for LONWORKS connections.

For more information on creating LONWORKS connections, see Creating LONWORKS Connections in

Chapter 4.

Designing a Modbus Network

You can design a Modbus network with the SmartServer. This entails creating and configuring

Modbus channels, devices, and data points. After you design a Modbus network, you can use the

SmartServer applications to read and write to the holding registers on the Modbus devices. For more

information on the Modbus protocol, go to www.modbus.org.

Creating and Configuring Modbus Channels

The SmartServer can interface with slave Modbus devices on TCP/IP, RS-232, and RS-485 channels.

The RS-232 channel protocol is the Electronic Industries Association (EIA) standard for the

interchange of serial binary data between two devices. The RS-485 channel protocol is a data protocol

used for transmitting data over longer distances.

Creating Modbus Channels

To add a Modbus channel to the local SmartServer network, follow these steps:

1. Right-click the network icon, point to Add Channel, and then select Modbus.

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