Siemens SIMATIC ET 200AL System Manual page 1117

PROFINET
PROcess FIeld NETwork, open industrial Ethernet standard which further develops
PROFIBUS and industrial Ethernet. A cross-manufacturer communication, automation, and
engineering model defined by PROFIBUS International e.V., as an automation standard.
Redundant systems
Redundant systems are identified by the fact that important automation components are
available in multiple units (redundant). Process control is maintained if a redundant
component fails.
Subnet
Part of a network whose parameters must be synchronized with the devices (e.g., with
PROFINET). It includes the bus components and all connected stations. Subnets can be
linked by means of gateways, for example, to form a network.
Synchronization module
The synchronization module is used to provide a redundant connection between the CPUs of
the S7-1500H redundant system. You require two synchronization modules per CPU, which
you connect using a fiber-optic cable.
System diagnostics
In the SIMATIC environment, the term "system diagnostics" refers to diagnostics of devices
and modules. System diagnostics is used, for example, to monitor the states of the following
components in the system: Power supply, device, I/O.
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
System states
The system states of the S7-1500R/H redundant system result from the operating states of
the primary and backup CPU. The term 'system state' is used as simple expression that
identifies the operating states of the two CPUs that occur at the same time. The S7-1500R/H
redundant system features the system states STOP, STARTUP, RUN-Solo, SYNCUP and
RUN-Redundant.
Diagnostics
Function Manual, 11/2019, A5E03735838-AF
Glossary
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