Siemens SIMATIC ET 200AL - Page 1214

Glossary
PROFINET with STEP 7 V15
Function Manual, 12/2017, A5E03444486-AH
267
Router
A router interconnects two subnets. A router works in a similar way to a switch. With a router,
however, you can also specify which communication devices may communicate via the
router and which may not. The communication devices on various sides of a router can only
communicate with one another if you have explicitly enabled communication between these
devices via the router. Real-time data cannot be exchanged beyond subnet boundaries.
RT
PROFINET IO with
R
eal
T
ime communication (RT) is the optimal transmission method for
time-critical applications in factory automation. PROFINET IO frames are prioritized over
standard frames in accordance with IEEE802.1Q. This ensures the required determinism in
the automation technology.
Security
Generic term for all the measures taken to protect against
● Loss of confidentiality due to unauthorized access to data
● Loss of integrity due to manipulation of data
● Loss of availability due to the destruction of data
Send clock
Period between two consecutive intervals for IRT or RT communication. The send clock is
the shortest possible transmit interval for exchanging data.
SIMATIC
The term denotes Siemens AG products and systems for industrial automation.
SIMATIC NET
Siemens Industrial Communication division for Networks and Network Components.
SIMATIC PC Station
A "PC station" is a PC with communication modules and software components within a
SIMATIC automation solution.
SIMATIC Memory Card (SMC)
→ Micro Memory Card (MMC)