SIMATIC HMI WinCC V7.0 System Description - DCE FEL ČVUT v ...

2.1 Expandability Process visualization with SIMATIC WinCC
Figure 13 Accessing STEP 7 symbol table
The Plant-wide Tag Selection dialog for integrated communication
opens anywhere you need a tag:
● WinCC tags
● Inputs, outputs, and bit memory from the STEP 7 symbol
table with predefined communication parameters and all
global data block parameters for integrated configuration
(see "Integrated configuration in SIMATIC Manager").
You filter and find tags, which you then insert using a dragand-drop
operation.
OPC
OPC DA servers provide process data in many areas of
SIMATIC automation systems and across manufacturers;
this also includes WinCC (for more information, refer to the
WinCC/ConnectivityPack option). External automation components
can be connected to WinCC with OPC (Openness,
Productivity and Collaboration, previously OLE for Process
Control), which is included in the WinCC basic system:
● Connect SIMATIC S5/S7 to WinCC via the
SIMATIC NET OPC server.
● Exchange data anywhere with the SIMATIC NET OPC
client.
● Connect WinAC controllers to WinCC via the WinAC
OPC server.
● Connect an existing WinCC or WinCC flexible project to
a higher-level operator control station.
● Access PROFINET (PN) tags via the PN-OPC server
within the framework of Component Based Automation.
With the OPC Item Manager from the basic system, you
access a tag of an OPC DA server, on the same computer
or on a computer in the connected network environment.
This is done in a directory tree structure during process
execution.
Figure 14 WinCC System Info
Figure 15 OPC Item Manager
The WinCC System Info communication channel
This communication channel provides system information
such as date, time, and drive capacity. The communication
channel requires no hardware, since it directly accesses the
system information of the computer on which it has been
installed. The process tags required for the System Info
channel need no licenses.
Possible applications:
● Represent the WinCC server system time in process
pictures
● Display CPU load in a trend
● Monitor swap file size with limit values and issue corresponding
messages
● Display bar graphs of available main memory and available
storage on local hard disks or drives, including different
WinCC servers
● Monitor drive capacity and issue corresponding messages
● Monitor print status, job status, spooler size, etc.
● Evaluate system information in scripts and events.
● Counter function for special test purposes in scripts
In multi-user and distributed systems, you can monitor
system information from multiple WinCC servers on one
WinCC client.
Special features
● Complex automation systems require comprehensive
diagnostics (see "Diagnostic system").
● With the WinCC Excel ConfigurationTool, you can
configure thousands of tags in Microsoft Excel, among
other things. WinCC reads this data in and then automatically
creates the tags with the specified properties
(see "Configuring complex projects").
● The cross-reference list provides a quick overview of the
configured process tags (even for existing projects) and
lets you know when process tags have been created but
are not in use in the configuration (see "Configuring
complex projects").
● When you point with the mouse to a link or tag in Tag
Management, WinCC displays the status information as
a ToolTip: status of a link, current process value with
quality code, time of last tag change.
● The quality code provides encrypted information about
the tag status and the quality of a tag.
SIMATIC WinCC System Description
12 A1900-L531-B996-X-7600, 09/2008