PROFIBUS

I'm working on the project using S7-200 to control MM440 with PROFIBUS protocol. As S7-200 (with PROFIBUS module EM277) cannot be a master so that i'm pretending to config a network that S7-300 is master, S7-200 and MM440 are slave (the pic below). However I still have some question on the project:

1. How can I branch the cable? I mean I should use 1 Profibus cable to connect S7-300 and EM277, however there is no available port for the 2nd profibus cable from mm440, right? Where should I connect MM440 to?

2. How will the process work? I write program on S7-200 and then the program transfered to S7-300 and then from S7-300 to MM440? 

It would be nice if someone can support me with those problem. Thank you so much 

Closed cause question posted twice.

The second thread with the subject PROFIBUS for S7-200 is published within the conference SIMATIC S7-200.

Best regards

Jen_Moderator