Dear all,
I would like to ask help about connecting the light bus module(manufacture by Beckhoff Co.) to new controller (Siemens S7-300).we have a machine consist on light bus module connected to each other to PC controller(manufacture by Beckhoff Co.). we want to update the current controller software, the system consist of the following configration with fiber glass cable ring connection(Light bus).

system Description (beckhoff Configration)
PC card interface connect to coupler 1
coupler 1 connect to coupler 2
coupler 2 connect to coupler 3
coupler 3 connect to PC card interface

Fieldbus Components
Coupler 1
Beckhoff BK 2000 (lightbus)
KL2408 (8x Digital Output)
KL9100 (Input terminal 24V DC)
KL2408 (8x Digital Output)
KL2408 (8x Digital Output)
KL2408 (8x Digital Output)
KL9100 (Input terminal 24V DC)
KL2408 (8x Digital Output)
KL1408 (8x Digital Input)
KL1408 (8x Digital Input)
KL1408 (8x Digital Input)
KL1408 (8x Digital Input)
KL1408 (8x Digital Input)
KL1408 (8x Digital Input)
KL4032 (2x Analogue output +-10V)
KL4032 (2x Analogue output +-10V)
KL9010 (K bus end terminal)

Coupler 2
Beckhoff BK 2000 (lightbus)
KL1408 (8x Digital Input)
KL1408 (8x Digital Input)
KL2408 (8x Digital Output)
KL2408 (8x Digital Output)
KL9010 (K bus end terminal)

Coupler 3
Beckhoff BK 2000 (lightbus)
KL1408 (8x Digital Input)
KL1408 (8x Digital Input)
KL5001 (SSI Encoder Interface)
KL5001 (SSI Encoder Interface)
KL9100 (Input terminal 24V DC)
KL2424 (4x Digital Output)
KL2424 (4x Digital Output)
KL2424 (4x Digital Output)
KL2424 (4x Digital Output)
KL2424 (4x Digital Output)
KL2424 (4x Digital Output)
KL2424 (4x Digital Output)
KL9010 (K bus end terminal)

I want to replace the Beckhoff BK 2000 (lightbus) of three coupler and change it for Profibus or CANOPEN module and connect it to S7-300,and i don't know what is the best configration for connecting beckhoff module to S7-300.

 

Hello,
use PROFIBUS DP bus couplers ... it's the "natural" solution for the S7-300

Best Regards
Armin Steinhoff

 

Assuming S7-300 has the DP interface port, then change the interface units on Beckoff to PROFIBUS interfaces. You should be able to use the existing IO modules on each interface. Interfaces will act as slave stations to the master (S7-300). Wire up the slaves to the master, and do the configuration in Step7.