Siemens SIMATIC S7-200 Handbuch für Fahrer - Seite 10
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Siemens S7-200 Driver
(such as values and arrays) are subject to float normalization. For example, EFM data is not affected by this
setting.
For more information on the floating point values, refer to "How To ... Work with Non-Normalized Floating
Point Values" in the server help.
Inter-Device Delay: Specify the amount of time the communications channel waits to send new requests to
the next device after data is received from the current device on the same channel. Zero (0) disables the
delay.
Note: This property is not available for all drivers, models, and dependent settings.
Channel Properties — Communication Serialization
The server's multi-threading architecture allows channels to communicate with devices in parallel. Although
this is efficient, communication can be serialized in cases with physical network restrictions (such as
Ethernet radios). Communication serialization limits communication to one channel at a time within a virtual
network.
The term "virtual network" describes a collection of channels and associated devices that use the same
pipeline for communications. For example, the pipeline of an Ethernet radio is the master radio. All channels
using the same master radio associate with the same virtual network. Channels are allowed to communicate
each in turn, in a "round-robin" manner. By default, a channel can process one transaction before handing
communications off to another channel. A transaction can include one or more tags. If the controlling
channel contains a device that is not responding to a request, the channel cannot release control until the
transaction times out. This results in data update delays for the other channels in the virtual network.
Channel-Level Settings
Virtual Network This property specifies the channel's mode of communication serialization. Options
include None and Network 1 - Network 500. The default is None. Descriptions of the options are as follows:
None: This option disables communication serialization for the channel.
l
Network 1 - Network 500: This option specifies the virtual network to which the channel is
l
assigned.
Transactions per Cycle This property specifies the number of single blocked/non-blocked read/write
transactions that can occur on the channel. When a channel is given the opportunity to communicate, this
number of transactions attempted. The valid range is 1 to 99. The default is 1.
Global Settings
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