Glossary
S7-1500R/H redundant system
506 System Manual, 01/2024, A5E41814787-AF
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 can find more information in the "Interrupt, diagnostics" glossary entry.
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.
DNA redundancy
DNA redundancy is the use of redundant Dual Network Access (DNA) to connect a network
with two decoupled networks. Two Y-switches are used for this purpose, as well as a DNA
manager and a DNA client.
DP
Distributed I/O
Equipotential bonding
Electrical connection (equipotential bonding conductor) that brings the conductive parts of
electrical equipment and other conductive parts to the same or approximately the same
potential. This prevents disruptive or dangerous voltages arising between these parts.
Fail-safe systems
Fail-safe systems (F-systems) are characterized by the fact that they remain in the safe state
during the occurrence of specific failures or immediately transition into a different safe state.
F-CPU
An F-CPU is a CPU with F-capability that has been approved for use in SIMATIC Safety. A
standard user program can also be run in the F-CPU.
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