Siemens Simatic S7-1500R System Manual page 313

Glossary
Cycle time
The cycle time is the time a CPU requires to execute the cyclic user program once.
Cyclic interrupt
You will find further information in the glossary entry "Interrupt, cyclic".
Data block
Data blocks (DBs) are data areas in the user program that contain user data. Available data
blocks:
● Global data blocks that you can access from all code blocks.
● Instance data blocks that are assigned to a specific FB call.
Device
A device can send, receive or amplify data via the bus, e.g. IO device via PROFINET IO.
Device names
Each IO device must have a unique device name. This is required to allow the IO controller
to communicate with an IO device. Advantage: Device names are easier to manage than
complex IP addresses.
In its delivery state, an IO device has no device name. A device name must be assigned
using the PG/PC before an IO device can be addressed by an IO controller. Example: For
the transmission of configuration data (including the IP address) during startup or for the
exchange of user data in cyclic mode.
Diagnostics
Monitoring functions include:
● Detection, localization and classification of errors, faults and alarms.
● Display and further evaluation of errors, faults and alarms.
They run automatically while the system is in operation. This increases the availability of
systems by reducing commissioning times and downtimes.
Diagnostics buffer
The diagnostics buffer is a battery-backed memory area in the CPU where diagnostics
events are stored in their order of occurrence.
Diagnostics interrupt
You will find further information in the glossary entry "Interrupt, diagnostics".
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S7-1500R/H redundant system
System Manual, 10/2018, A5E41814787-AA