Communication between PLC (1-2)

[profmaster 0]

Hi, I need some info regarding Siemens PLC. I'm new with this model, Siemens Simatic 505 Family, CPU PLC 555 I think this is very old model. I need do some modification. Is that possible I use RS232 to communicate with PLC. I want make from 1 PLC(main) to 2 PLC(slave). How I want communicate between PLC CPU using RS232? I found each CPU board have 2 com port. RS232 #1 and RS232 #2. RS232#1 is connected to Touch Screen and RS232#2 still available. What I must to do? One more thing, I found 1 card that know as Peerlink at each PLC rack. What is that? Please help. Thanks....

[profmaster 0]

No body know about this ar.!!???

[aggattapauer 2]

That is an old Texas Instrument PLC. Try to looking for TI505 or TI555 maybe you'll find something helpful