Glossary - Siemens Simatic S7-1500R System Manual

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.
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 node and bus cable.
Bus, self-assembling
The modules are lined up on the mounting rail. They are mechanically and electrically
connected to each other with a U connector as they are swiveled into position. In this way
the bus is extended with each module.
310
S7-1500R/H redundant system
System Manual, 10/2018, A5E41814787-AA