Definition
Basic Process Control (BPC) is included in the WinCC basic system and provides additional configuration tools for implemen- ting typical control tasks.
Application
With BPC, you benefit from a whole range of control func- tions from power plant technology, process engineering, and process control for your configuration. The control system is generated automatically and helps you create an efficient configuration.
Structure
Figure 47 Control system process picture in Microsoft Internet Explorer
A control system process picture comprises from top to bottom an overview area, a working area, and a key area with the following functions (partial listing):
● Logon via chip card or password ● Group displays in the overview area ● Various message lists
● Process control in the working area
● Initiation of operator input and navigation in the key area ● Customized arrangement of process pictures
● Online compilation of trends
● Visualization, setup, and modification of SFC charts ● Message sequence log printout
The group displays present process displays and opera- tional displays in compressed format and are integrated into the overview area. In the group display, you can see if a picture object has triggered a message or if a message is waiting for acknowledgment in a lower-level process picture. Group displays are automatically derived from the picture hierarchy thus enabling the operator to navigate to the picture object that triggered the message simply by pointing and clicking.
Group displays can also be used in process pictures, con- figured according to user requirements via object properties, and linked irrespective of the picture hierarchy. The group display is controlled by a process tag that represents the message status with a total of 16 message types. The message system is conveniently displayed in a mes- sage window in which you can switch between the different message lists (for more information, see "Message system"):
● New messages that have not yet been acknowledged ● Acknowledged messages that have not yet gone out ● Control system messages
● Operator input messages and system messages ● List of hidden messages
The Split Screen Manager manages the individual picture composition and saves each change made to a basic pic- ture in a dedicated picture history.
When selecting a picture, the operator has the following options:
● Group display ● Picture memory
● Navigation in the picture hierarchy ● Names with picture preview ● Measuring point
● Alarm source (Loop-in alarm)
OS Project Editor
Figure 48 OS Project Editor
The control system, the message system, and the picture hierarchy are generated automatically in the WinCC by the OS Project Editor, thus reducing the required engineering effort. In an integrated configuration, the OS Project Editor even runs automatically, generating all required configura- tion data and an image of the plant configuration (see "Inte- grated configuration in SIMATIC Manager"). In a non- integrated configuration, the picture hierarchy is derived from the hierarchy tree in WinCC (see Picture Tree Man- ager).
Process visualization with SIMATIC WinCC 2.2 Efficiency The OS Project Editor is only necessary if you want your
configuration to differ from the default settings or if you are creating a new project in WinCC with Basic Process Control: ● On the "Layout" tab, you configure the appearance of
the runtime user interface.
● On the "Message Configuration" tab, you configure set- tings for the message system. The basic settings corre- spond to the specifications for message configuration. ● On the "Message Display" tab, you configure the
message pages, group displays, and message filter. ● On the "Areas" tab, you configure the overview of plant
sections.
● On the "Runtime Window" tab, you configure the number and arrangement of the pre-configured picture windows. A customized screen arrangement can be saved and displayed for each user.
● The "Basic Data" tab specifies, among other things, whether basic data such as individually modified process pictures and actions should be retained during automatic generation. The plant sections of all server projects are displayed in the overview of the basic data picture. If a WinCC server fails, all associated plant sections are highlighted.
Picture Tree Manager
In Picture Tree Manager, you arrange the process pictures in a hierarchy tree of plants and process units using a drag- and-drop operation. This automatically generates a navi- gation with picture selection function. In runtime, the opera- tor scrolls through the picture hierarchy and selects process pictures and measuring point by name.
Hierarchy information is stored in the message system, in the user administration system, in block lists, and in server packages. In the message system, you assign specific mes- sages to a plant section ("paint shop", for example). In user administration, you assign access rights for specific plant sections. A message is only displayed if the operator has access rights for that specific plant section.
Figure 49 Picture Tree Manager
Time Synchronization
Time synchronization is configured for automation systems (AS) and WinCC over the Industrial Ethernet bus/plant bus and for Operator Stations (OS) over the local area net- work/terminal bus. An OS is the active time master and receives the current time of day, for example, by means of the optional time signal receiver (Siemens DCF77 receiver, SICLOCK, or Siemens GPS receiver). A time slave receives the current time and synchronizes its internal clock. If a time master fails, a standby time master that supports both master broadcast (time master transmits time signals) and time polling (time slaves request time) takes over the task of time synchronization.
Horn
The "Horn Editor" is used to control optical or acoustic sensors or output sound files to sound cards whenever a message from a specific message class, type, or priority comes in.
The WinCC option package includes a signal module with a watchdog to which you can connect up to three different signaling devices (horns, buzzers, and lamps) as well as a hardware acknowledgment.
Lifebeat monitoring
Lifebeat monitoring monitors the WinCC clients as well as the communication connections between the OS and AS. During its automatic execution, the OS Project Editor gener- ates a corresponding plant configuration of all communica- tion connections to be monitored and creates the necessary process control messages. Manual configuration of lifebeat monitoring is not necessary on the WinCC client itself. The plant configuration shows the configuration of the WinCC server whose WinCC packages are loaded. In a WinCC client project, the status of the lifebeat objects moni- tored by the WinCC servers is displayed as well as the communication connections to the WinCC servers. In the event of a fault, the faulty lifebeat objects are displayed.
Component List Editor
When the OS Project Editor is executed, the component list is created automatically. The Component List Editor dis- plays all information of the component list. With the Compo- nent List Editor, you configure for a measuring point the entry point picture for the loop-in alarm and the assignment to the plant sections. If necessary, you can also create new measuring points.
Special features
Basic Process Control is also released for Web clients that are used as WinCC clients via WinCC/WebNavigator: ● Simultaneous access to several WinCC servers ● All message views, including loop-in alarm ● Access rights for specific plant sections
● User-specific start screen and runtime language ● Support of operator messages
● Look&Feel of the WinCC user interface with group dis- play and extended status display
2.3 Security and availability Process visualization with SIMATIC WinCC