yuwanee

Hi,

Now I'm workingin the project that will have about200 simocode pro.Vconnect to PLC via Profibus DP network. So we designed to seperate network to two profibus lines. All simocode will be installed in one room so the network length <100 meter. My question is, do i need repeater and terminator in this case? I try to test with about 20 module and it's ok without those device.

I have to use CP443-5ext for another bus. Do I have to do something about send/receive in PLC program? Or i can directly address I/O according to hardware configuration?

Thank you.

Hi

Try to connect 35 simocode on the same profibus line..

Read in manual SIMATIC NET PROFIBUS Networks said:

"To increase the number of nodes (>32) in a network or to extend the cable length
between two nodes, segments can be connected together using RS-485 repeaters
to form a network. ... "

Also " ...When configuring an electrical network with RS-485 repeaters, the following
conditions must be taken into account:

The maximum segment length for the transmission rate must be adhered to
(see Table 3-1, Table 3-3, Table 3-6,)

The maximum number of bus attachments (nodes, OLMs, RS-485 repeaters,...)
in one segment is restricted to 32. There may be further restrictions at a
transmission rate of 1.5 Mbps (see Section 3.1.2).

The maximum number of nodes in one network is limited to 127.

A maximum of 9 RS-485 repeaters can be installed between two nodes.>>> "

About CP443-5ex. I hope this link will be helpfull:

Description of the CP 443-5 Extended

S7-CPs for PROFIBUS Configuring and Commissioning

regards