Siemens SIMATIC HMI series, Системное руководство

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3.6 "SIMATIC S7-1200, S7-1500 Channel" channel DLL
With WinCC V7.4, process communication is extended via communication channel "SIMATIC
S7-1200, S7-1500 Channel".
New functions support stable communication in your plant, for example tag synchronization
with the controller and system diagnostics with WinCC SysDiagControl.
Increased number of connections
As of WinCC V7.4, the following performance data applies:
● SIMATIC S7-1200: Up to 32 connections
● SIMATIC S7-1500: Up to 128 connections
The maximum possible number of connections is limited by the available system resources
and their performance data, particularly CPU, RAM, Ethernet connection.
Use of raw data tag communication
As of WinCC V7.4, the channel "SIMATIC S7-1200, S7-1500 Channel" supports the data type
"Raw data tag".
Raw data tags as byte arrays are used for transferring user data blocks between WinCC and
AS and handle only user data. The acyclic read service of the controller is supported for raw
data tags, e.g. the tag request via C scripts.
A raw data tag as byte array is handled in the channel like a normal process tag that is
addressed via address and length of the data area, for example DB1, DBB10, length 100 bytes.
Establishing or terminating a connection in Runtime
New, connection-specific tags provide you with the option of establishing or terminating
channel connections during operation:
● The tag "@<ConnectionName>@ForceConnectionState" determines the connection
status between a WinCC station and S7-1200 / S7-1500.
● The tag "@<ConnectionName>@ConnectionState" reports the current status of the
connection.
Synchronizing WinCC tags with the controller
Configuration changes in the TIA Portal can, for example, lead to WinCC tags no longer
matching the AS icons.
As of WinCC V7.4, the tags and settings are automatically synchronized after they have been
downloaded from the controller or a file. The WinCC Tag Management compares the properties
of the AS symbols with the tag properties in the WinCC project. Non-matching properties are
marked in the tab "AS Symbols" and named in tooltips.
You can read in the AS configuration again using the "Update" function and restore the
consistency.
What's new in WinCC V7?
3.6 "SIMATIC S7-1200, S7-1500 Channel" channel DLL
WinCC: General information and installation
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System Manual, 02/2017, A5E40840020-AA