Glossary
CPU 1516pro-2 PN (6ES7516-2PN00-0AB0)
Operating Instructions, 09/2016, A5E35873416-AA
141
Real-time means that a system processes external events within a defined time.
Determinism means that a system responds in a predictable (deterministic) manner.
Both requirements are important for industrial networks. PROFINET satisfies these
requirements. PROFINET is a deterministic real-time network by virtue of the following:
● Transmission of time-critical data between different stations over a network in a defined
time interval is guaranteed. For this, PROFINET provides an optimized communication
channel for real-time communication: Real-time (RT)
● An exact determination (forecast) of the transmission time instant is possible.
● It is ensured that smooth communication can take place in the same network using other
standard protocols, e.g. industrial communication for PG/PC.
During a warm restart, all non-retentive bit memory is deleted and non-retentive DB contents
are reset to the initial values from load memory. Retentive bit memory and retentive DB
contents are retained. Program execution begins at the call of the first startup OB.
A memory area whose content is retained after power failure and after a STOP to RUN
transition is retentive. The non-retentive area of the bit memory, timers and counters is reset
after power failure and after a STOP to RUN transition.
Error that occurs during execution of the user program in the automation system (thus not in
the process).
afety
xtra
ow
oltage = Safety extra-low voltage
Encoders are used for exact acquisition of digital and analog signals and for measurement of
distances, positions, velocities, rotational speeds, masses, etc.
IO device that makes its data available to multiple IO controllers.
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