Siemens SIMATIC S7-1500/ET 200MP System Manual page 373

Glossary
Data block
Data blocks (DBs) are data areas in the user program that contain user data. There are global
data blocks, which can be accessed from all code blocks, and instance data blocks, which 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
Before an IO device can be addressed by an IO controller, it must have a device name. This
approach was chosen for PROFINET because names are easier to administer than complex IP
addresses.
In its delivery state, an IO device has no device name. An IO device be addressed by an IO
controller only after a device name has been assigned using the PG/PC, e.g. for the
transmission of configuring data (including the IP address) during start-up or for the
exchange of useful data in cyclic mode.
Device station
A device may only exchange data with a master after being requested to do so by the master.
Diagnostic buffer
The diagnostic buffer is a battery-backed memory area in the CPU where diagnostic events
are stored in their order of occurrence.
Diagnostic interrupt
You can find relevant information under the entry "Interrupt, Diagnostics"
Diagnostics
Monitoring functions for the detection, localization, classification, 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.
Distributed I/O system
System with I/O modules that are configured on a distributed basis, at a large distance from
the CPU controlling them.
DP
Distributed I/O
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Automation system
System Manual, 01/2023, A5E03461182-AK