Siemens SIMATIC HMI Series System Manual page 70

WinCC Release Notes
2.3 Notes on WinCC
Openness and system stability
WinCC enables high performance actions to be programmed on individual graphic objects and
even complete functions and global action scripts independent of the individual components.
C scripting:
WinCC and Windows API functions can be called in the action scripts. In addition, the
integrated script programming contains a C interpreter with a large number of standard
functions complying to ANSI-C.
Please note that, due to the openness of the system, it is possible to write actions that block
the system and lead to system crashes in runtime due to continuous loops, incorrectly initialized
pointers, etc. Pay attention to the availability of allocated memory.
VB scripting
VBScript (VBS) enables access to tags and objects of the graphical runtime system during
runtime. In addition to VBS standard functions and constants, the Windows Scripting Host and
the MS Automation interface can also be used to make the Windows environment dynamic.
There is no guarantee nor WinCC support for the VBS functionality with regard to its adaptation
to the Windows environment.
You can find additional information in the following sections of the WinCC Information System:
● "ANSI-C for Creating Functions and Actions"
● "VBS for Creating Procedures and Actions"
● "Process Picture Dynamics"
Time synchronization
Time synchronization between the servers and automation systems is essential for the correct
functioning of:
● Redundancy synchronization
● Chronological messaging
● Search and sorting criteria using the time code
● Operating multi-user projects in one domain
You can find additional information in the following sections of the WinCC Information System:
● "Redundant systems"
● "Chronological reporting"
● "Multi-user systems"
● "Time synchronization"
Complete download of redundant systems
Do not perform a complete download to the redundant systems in SIMATIC Manager using
the "Target system / Compile and Download Objects..." function, as this can create inconsistent
data on the target system.
70
WinCC: General information and installation
System Manual, 02/2017, A5E40840020-AA