Siemens SIMATIC S7-1500 System Manual page 370

Glossary
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.
Diagnostics interrupt
You can find relevant information in the entry "Interrupt, diagnostics".
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
DP master
The DP master is a central component in the PROFIBUS DP data bus that exchanges data with
its assigned distributed stations (slaves) in a defined, continually repeating message cycle.
DP slave
An I/O device acting as a passive node in PROFIBUS DP that reads in input information and
sends output information to the I/O.
Drive Control Block (DCB)
Multi-instance block that is selected from a predefined block library in the DCC editor and is
used to set the control functionality.
Drive Control Chart (DCC)
Allows the user to implement additional continuous, drive control and math functions using a
set of function blocks ("Drive Control Blocks", DCB) in a function block library. These function
blocks can be graphically interconnected using a configuration tool ("Drive Control Chart
Editor", DCC editor).
Drive object
A drive object is a separate, discrete software functionality with its own parameters and in
some cases also its own faults and warnings.
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SIMATIC Drive Controller
System Manual, 11/2023, A5E46600094-AD