S7-1500R/H redundant system
503 System Manual, 01/2024, A5E41814787-AF
Glossary
AR
The AR (Application Relation) covers all communication relations between IO controller and
IO device (for example IO data, data records, interrupts).
Automation system
Programmable logic controller for the open-loop and closed-loop control of process chains in
the process engineering industry and in manufacturing technology. The automation system
consists of different components and integrated system functions according to the
automation task.
Backbone ring
A backbone ring is a very high-speed network. PROFINET components can only be connected
to the backbone ring via switches, as the bandwidth for PROFINET is limited to 100 Mbps.
Example: Network ring with video cameras in a tunnel.
Backup CPU
Role of a CPU in the S7-1500R/H redundant system. If the R/H system is in the RUN-Redundant
system state, the primary CPU controls the process. The backup CPU processes the user
program synchronously and can take over process control if the primary CPU fails.
Baud rate
Data transmission rate indicates the number of bits transmitted per second (baud rate = bit
rate).
Bit memory
Bit memory is a component of the system memory of the CPU for saving intermediate results.
You access the bit memory through the user program bit by bit, byte by byte, word by word
or double word by double word.
Bus
Joint transmission path to which all devices in a fieldbus system are connected.
Bus cable connector
The bus cable connector is the physical connection between bus device and bus cable.
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