Glossary - Siemens SIMATIC S7-1500 Function Manual

Glossary

Analog-to-digital conversion
Conversion of analog input signals into digital signals for processing in the CPU.
Application, isochronous
User program in the isochronous mode interrupt OB. The user program in the isochronous
mode interrupt OB ensures the isochronous and consistent updating of the assigned process
image participation.
Automation system
Programmable logic controller for the open-loop and closed-loop control of process chains in
process and production engineering. The automation system consists of different
components and integrated system functions depending on the automation task.
Backplane bus
The backplane bus is a serial data bus for module intercommunication and the distribution of
the necessary power to the modules.
Bus
A bus is a transmission medium that interconnects several devices. Data transmission can
take place electrically or via optical fiber, both in series and in parallel.
CPU
Central Processing Unit - Central module of the S7 automation system with a control and
arithmetic unit, memory, operating system and interface for programming device.
Delay time
In isochronous mode, the delay time is the time between the send clock and the start of the
isochronous mode interrupt OB. During this time, the IO controller/DP master performs the
cyclic data exchange with the IO devices/DP slaves.
Determinism
Determinism means that a system responds in a predictable (deterministic) manner.
Isochronous mode
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