s7-200

hello everybody!

1. how can we network a 30pcs. of s7-200 plc?
2. how can we extract data from these plc going to a database in a PC?

It sounds like you have 30 S-7 200 PLC's that you want to receive data from. I would suggest using a profibus (EM277) or ethernet (CP243) module for each. The port on the module has a limited number of connections and will not allow 30. Use an HMI or an OPC server to get data out.

Can anybody give more details about this?

The onboard CPU ports (PPI) offer also to connect up to 127 devices
(where max. 32 are Masters), you don`t need other communication modules.

Don not try to set all 30 units to master mode (SMB30/130).
For a high flow-rate you should set as low as possible devices to master
mode. Place the master devices on strategical points (e.g. for each arm
one master device).

The master collects the required data from his associate slaves.
Only the master devices exchange the collected data.

You need Profibus cables for the network. Keep in mind that the CPU
port is not potential free (in contrast to the EM277 module), so you need a repeater if the distance between
2 CPUs are >50meters.
To bridge a distance up to 1200meter take 2 repeaters (the wire between
them are potential free):

For further information and network hints refer the S7-200 system manual
at chapter 7.

to collect the data from these plcs u can use the pc access software which is the opc server for the s7 200 family

thx for all of ur help guys

Maybe this link will help

Best of luck,

I'm really interested to know how you proceed, let us know if possible.

regards

Hello ftp

I have made a project who have a Network with 26 CPU s7-200, and get the data into a PC

If you polling all PLC from the computer your application will be
very slow,
The Soluction that we found was that:
1-Connected all CPU using MPI (187 kb/S),
2- On the top we put one S7-226 (with two port on port are conneted directely to the PC and the other will be
conneted to the MPI Network
3-With Command NETWORK READ we pick up the data of the all CPU´s on network to our S7-226.
4- And the computer polling only the S7-226,
Regards
from
José Brás
From Centroliva SA
Rua da Cabine Armazem 2 Vilar VCD
Portugal
Phone 351-229289417
Fax 351-229289419
Email [email protected]