Remote modules
CNC 8060
CNC 8065
9.
(REF: 1402)
·143·
SERCOS BUS.
9 SERCOS BUS.
The Sercos interface is a communications standard designed especially for the machine-
tool world and that allows a simple interconnection between the CNC, drives and RCS-S
modules. 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 supplies the fiber optic cables needed for Sercos communication. There
are several types of cable depending on their length and their 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 fiber optic cable is going to withstand static conditions (not moving), always
use the SFO cable
• Fiber optic cable with glass core (SFO-V-FLEX) for over 40 meters.
Mechanical cable characteristics.
SFO cable.
Flexibility. Normal. Minimum bending radius of 30 mm.
Only to be used in static systems (not moving).
Cover. PUR. Polyurethane resistant to chemicals used in machines.
Temperature. Working: -20 ºC / 80 ºC (-4 ºF / 176 ºF).
Storage: -35 ºC / 85 ºC (-31 ºF / 158 ºF).
SFO-FLEX cable.
Flexibility. High. Minimum bending radius, static = 50 mm and dynamic = 70 mm.
Special cable to be used in cable chains.
Cover. PUR. Polyurethane resistant to chemicals used in machines.
Temperature. Working: -20 ºC / 70 ºC (-4 ºF / 158 ºF).
Storage: -40 ºC / 80 ºC (-40 ºF / 176 ºF).
SFO-V-FLEX cable.
Flexibility. Minimum bending radius, static = 45 mm and dynamic = 60 mm.
Cover. PUR. Polyurethane resistant to chemicals used in machines.
Temperature. Working: -40 ºC / 80 ºC (-40 ºF / 176 ºF).
Storage: -40 ºC / 80 ºC (-40 ºF / 176 ºF).
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