Hardware configuration.
CNC 8070
6.
CENTRAL UNIT + MONITOR (Q7-A PLATFORM).
Connections.
·134·
(REF: 1911)
6.8.12 Sercos II bus.
The Sercos interface is a communications standard especially designed for the machine-
tool industry offering a simple interface between the CNC and the drives. All the data and
commands are transmitted in digital format through fiber optic lines that make up a ring (the
Sercos ring) that connects all the elements of the bus (CNC and drives) to each other. Using
the Sercos interface considerably minimizes the necessary hardware, makes cabling
simpler and grants greater reliability to the system making it immune to electrical interference
(noise).
Sercos cable characteristics.
Fagor Automation provides the fiber optic cables needed for Sercos communication. There
are different types of cables depending on length and dynamic and static installation
characteristics.
• Fiber optic cable with polymer core (SFO, SFO-FLEX) for up to 40 meters. If the fiber
optic cable is going to withstand dynamic conditions (moving), always use the SFO-FLEX
cable If the cable will be subject to static conditions (it will not be moving), the SFO cable
will be enough.
• Fiber optic cable with glass core (SFO-V-FLEX) for over 40 meters.
Mechanical characteristics of the cables.
Sercos III bus with CNC (master) and DDS drives.
SFO cable.
Flexibility. Normal. Minimum bending radius of 30 mm.
Only to be used when the cable will not be moving (static conditions).
Covering. PUR. Polyurethane resistant to chemical used on machines.
Temperature. Work: -20 ºC / 80 ºC (-4 ºF / 176 ºF).
Storage: -35 ºC / 85 ºC (-31 ºF / 158 ºF).
SFO-FLEX cable.
Flexibility. High. Minimum static bending radius of 50 mm and a dynamic radius of
70 mm.
Special cables to be used in cable carrying chains.
Covering. PUR. Polyurethane resistant to chemical used on machines.
Temperature. Work: -20 ºC / 70 ºC (-4 ºF / 158 ºF).
Storage: -40 ºC / 80 ºC (-40 ºF / 176 ºF).
SFO-V-FLEX cable.
Flexibility. Minimum static bending radius of 45 mm and a dynamic radius of 60 mm.
Cover. PUR. Polyurethane resistant to chemical used on machines.
Temperature. Work: -40 ºC / 80 ºC (-40 ºF / 176 ºF).
Storage: -40 ºC / 80 ºC (-40 ºF / 176 ºF).
Master
Node 1 Node 2
Sercos II bus.
B32
IN
Node n
OUT
IN
OUTOUT
IN
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