Siemens S7-200 - Channel Properties - Write Optimizations

Siemens S7-200 Driver
l Network Adapter: Indicate a network adapter to bind for Ethernet devices in this channel. Choose a
network adapter to bind to or allow the OS to select the default.
Specific drivers may display additional Ethernet Encapsulation properties. For more information, refer
to Channel Properties — Ethernet Encapsulation.
Modem Settings
l Modem:Specify the installed modem to be used for communications.
l Connect Timeout:Specify the amount of time to wait for connections to be established before
failing a read or write. The default is 60 seconds.
l Modem Properties:Configure the modem hardware. When clicked, it opens vendor-specific modem
properties.
l Auto-Dial:Enables the automatic dialing of entries in the Phonebook. The default is Disable. For
more information, refer to "Modem Auto-Dial" in the server help.
l Report Comm. Errors:Enable or disable reporting of low-level communications errors. When
enabled, low-level errors are posted to the Event Log as they occur. When disabled, these same
errors are not posted even though normal request failures are. The default is Enable.
l Close Idle Connection:Choose to close the modem connection when there are no longer any tags
being referenced by a client on the channel. The default is Enable.
l Idle Time to Close:Specify the amount of time that the server waits once all tags have been
removed before closing the modem connection. The default is 15 seconds.
Operation with no Communications
l Read Processing:Select the action to be taken when an explicit device read is requested. Options
include Ignore and Fail. Ignore does nothing; Fail provides the client with an update that indicates
failure. The default setting is Ignore.
Channel Properties — Write Optimizations
As with any server, writing data to the device may be the application's most important aspect. The server
intends to ensure that the data written from the client application gets to the device on time. Given this goal,
the server provides optimization properties that can be used to meet specific needs or improve application
responsiveness.
Write Optimizations
OptimizationMethod: controls how write data is passed to the underlying communications driver. The
options are:
l Write All Values for All Tags:This option forces the server to attempt to write every value to the
controller. In this mode, the server continues to gather write requests and add them to the server's
internal write queue. The server processes the write queue and attempts to empty it by writing data
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