BECKHOFF BK7500 - Manual (Page 27)

SERCOS interface Coupler BK7500
BK7500 27
The transfer medium: plugs and cables
BK7500 Sercos Coupler Fiber optic conductor: the SERCOS User group elaborated the
specification of a transmission technology based on fiber optic conductors
for applications in highly interference-prone environments and also to
increase the range.
Using the SERCOS bus couplers BK7500 the realization of optical Sercos
networks with ring technology (optical one fiber with plastic fiber conductor)
is possible. The maximum amount of stations is 254. The baud rate can be
adjusted via DIP switches on the BK7500. Additional information can be
find in the following table:
The Medium Fundamental properties of
optical fibre transmission
technology
Network topology Ring system, active devices between the cable sections
Medium Z1100 plastic optical fibre
Z1101 plastic optical fibre with PU cladding
Number of stations 254 stations in the ring
with plastic optical
fibre 0.3 m to 45 m
Min. bending radius 3 cm
Transmission rate 2, 4, 8 Mbit/s or 16 Mbit/s
Plug connector Z1003 standard plug F-SMA for plastic optical fibres
It is possible to prepare plastic fiber-optic conductors using usual tools.
Special tools are needed to prepare the HCS conductors.
A closed ring must be established in one system. The data path begins in
the master and passes through all stations. The return path must end in the
master again.
The plastic fiber-optic cable can be processed without special tools. A
connector can be produced swiftly and reliably using a knife, pliers and
emery paper. The connector engages in the slaves.
Each station in the ring has on "incoming" and a "continuing" Interface.
Swapping of the "incoming" and "continuing" interfaces will not damage
them. In the activated state, the fault can be located easily. The red lit end
of the fiber-optic conductor is plugged into the interface that is not lit.