Technical data

(only when using the SINEC L2 bus cable)
Various cables are available from Siemens for SINEC
L2
Number of stations: max. 32 per bus segment
max. 127 per network when using repeaters
The SINEC L2 bus terminal is used to structure the network. The bus
terminals can be connected to any standardized L2 connector (9-pin sub-D
socket). The pin assignment of the terminal connector corresponds to the
PROFIBUS standard. When supplied, the bus terminal is fitted with a cable
for connection to the CP 5430 TF/CP 5431 FMS communications
processor.
☞
For disturbance-free operation with the terminator connected,
the bus terminal requires the 5 V supply voltage from the
DTE. The DTE at the end of the bus must be switched on.
2.2.3.2 Transmission with Fiber Optic Cables (FO)
The fiber-optic version of SINEC L2 is implemented by an active star
coupler and optical bus terminals. Owing to the physical characteristics of
the fiber-optic cable, SINEC L2FO is structured as a star network.
The data terminal equipment DTEs (e.g. SIMATIC S5 programmable
controllers) are connected to the modules of the active star coupler in
point-to-point links (star) via the bus terminals and glass or plastic
fiber-optic cables.
The length of these point-to-point links depends on the data rate and can be
up to 1400 m long with the SINEC L2FO standard cable 62.5 / 125
µ
m.
Several active star couplers can be cascaded to form more complex
networks (greater number of DTEs, branched networks, wider spread). The
number of active star couplers that can be connected in series, however, is
reduced at higher data rates.
B8976060/02 System Overview
2 - 15 Volume 1