System overview SERCOS interface

SERCOS is an internationally standardised digital interface for communication between controllers and drives according to IEC 61800-7. Originally developed as a fast fibre-optic drive bus system, SERCOS is very widely used in Motion Control applications. The advantages such as high data rate and short cycle time can be used also for the I/O periphery. A fibre-optic ring is used as the transmission medium in SERCOS II; communication takes place in SERCOS III via the physical medium of Ethernet.

TwinCAT

Industrial PC/
Embedded PC

Bus Terminals

EtherCAT
Terminals

Drive
Technology

TwinCAT I/O
– TwinCAT System Manager
– TwinCAT as SERCOS master

SERCOS II master:
IPC

SERCOS II master:
IPC

SERCOS II master:
Embedded PC with master
connection CX1500-M750

PCI Fieldbus Card FC750x

Mini PCI Fieldbus Card FC7551

SERCOS II slave:
Bus Coupler BK75x0,
Bus Terminals

EtherCAT

SERCOS III slave:
Bus Coupler EK9700,
EtherCAT Terminals

SERCOS II slave:
Servo Drives AX250x-B750

SERCOS II slave:
Servo Drives AX20x0-B750