Siemens SIMATIC ET 200AL - Page 683

Glossary
Diagnostics
98 Function Manual, 09/2016, A5E03735838-AD
System diagnostics indicator (WinCC)
The system diagnostics indicator is a predefined graphic symbol of the library which alerts
you to errors in your plant and displays two states: No error, error
Topology
Structure of a network. Common structures include:
● Linear bus topology
● Ring topology
● Star topology
● Tree topology
User program
In SIMATIC, a distinction is made between user programs and the firmware of the CPU.
The user program contains all instructions, declarations and data by which a plant or process
can be controlled. It is assigned to a programmable module (for example, CPU, FM) and can
be structured in smaller units.
Firmware: see glossary entry "Firmware of the CPU"
Value status
The value status describes a specific signal state. The value status is constantly updated
and cyclically transmitted by the field device as quality statement together with the measured
value.
Web server
Software/ communication service for data exchange using Ethernet. The web server
provides the documents by means of standardized transmission protocols (HTTP, HTTPS) to
a web browser. Documents can be static or dynamic upon request by the web browser
composed from different sources by the web server.
WinCC
W
indows
C
ontrol
C
enter: a PC-based process visualization system
WinCC Runtime
Component of the basic software WinCC