Technical data

Glossary
PROFIBUS Network Manual
System Manual, Edition 04/2009, C79000-G8976-C124-03
347
SIMATIC NET PC modules
SIMATIC NET PC modules are modules for connecting the PC to bus systems, such as
PROFIBUS or Industrial Ethernet.
Slave
A slave can only exchange data after being requested to by a -> master. Slaves include, for
example, all DP slaves such as ET 200S, ET 200X, etc.
SOFTNET for PROFIBUS
SOFTNET for PROFIBUS is the protocol software for the SIMATIC NET PC modules CP
5511 and CP 5611.
Standard mounting rail
Metal rail standardized in compliance with EN 50 022.
The standard rail is used for the snapon installation of network components such as OLMs,
repeaters etc.
Suppressor
Component for reducing induced voltages. Induced voltages occur when circuits with
inductances are turned off.
Surge arrester
are used to limit overvoltages from remote strikes or from induction effects (for example
switching in power circuits). Surge arresters (in contrast to lightning arresters) divert currents
with a significantly lower peak value, discharges and specific energies.
Terminating resistor
Is a resistor that terminates a bus cable with its characteristic impedance; terminating
resistors are always required at both ends of a PROFIBUS segment.
In SIMATIC NET PROFIBUS DP, the terminating resistors are
● activated and deactivated in the D-sub bus connectors or bus terminals.
● Screwed onto the device as an M12 bus terminator
● Installed as an active RS-485 terminator
In SIMATIC NET PROFIBUS PA, the terminating resistors are
● Screwed onto the SpliTConnect Tap as SpliTConnect terminators.
Terminator
-> terminating resistor in bus segments at transmission rates of 9.6 kbps to 12 Mbps; the
power supply is separate from the bus nodes.