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Siemens TCP/IP Ethernet Driver Help

Optimizing Siemens TCP/IP Ethernet Communications

The Siemens TCP/IP Ethernet Driver was designed to provide the best performance with the least amount of

impact on the system's overall performance. While the Siemens TCP/IP Ethernet Driver is fast, there are a couple

of guidelines that can be used to optimize the application and gain maximum performance.

This server refers to communications protocols like Siemens TCP/IP Ethernet as a channel. Each channel defined

in the application represents a separate path of execution in the server. Once a channel has been defined, a

series of devices can then be defined under that channel. Each of these devices represents a single Siemens

TCP/IP Ethernet controller from which data will be collected. Although this approach to defining the application

provides a high level of performance, it does not take full advantage of the Siemens TCP/IP Ethernet Driver or the

network. An example of how the application may appear when configured using a single channel is shown below.

Each device appears under a single Siemens TCP/IP Ethernet channel.

In this configuration, the driver must move from one device to the

next as quickly as possible to gather information at an effective rate.

As more devices are added or more information is requested from a

single device, the overall update rate begins to suffer.

If the Siemens TCP/IP Ethernet Driver could only define one channel, then the example above would be the only

option available; however, the Siemens TCP/IP Ethernet Driver can define up to 256 channels. Using multiple

channels distributes the data collection workload by simultaneously issuing multiple requests to the network. An

example of how the same application may appear when configured using multiple channels is shown below.

Each device has now been defined under its own channel. In this new

configuration, a single path of execution is dedicated to the task of

gathering data from each device.

The performance will improve even if the application has more than

256 devices. While 256 or fewer devices may be ideal, the application

will still benefit from additional channels. Although spreading the

device load across all channels will cause the server to move from

device to device again, it can now do so with far less devices to

process on a single channel.

Important: Although the OPC server limits the number of channels to 256, the device ultimately determines the

number of allowed connections. This constraint comes from the fact that some devices cannot support 256

connections. For these devices, the maximum number of channels defined should equal the maximum number of

connections allowed. For devices that support more than 256 connections, the maximum 256 channels should be

defined, with devices spread evenly over these 256 channels. For more information on device connections, refer

to Link Settings.

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