Siemens s7-300 ppi connection masters detected

02js4130

Member
Join Date
Jun 2014
Location
Wales
Posts
38
HI,

I am new to Siemens and having difficulties connection to the S7-300. I have recently been connecting to the 200 without a problem so assumed that establishing communications with the 300 would be similar.

This PLC is out of an old control panel and is currently sitting on a desk.

Hardware i am using is the siemens rs232/ppi Multi-master Cable running in to my laptop USB with an Omron serial converter. (Which was fine for the S7-200)


so i am using PC/PPI able PPI.1 (COM3) interface

And when i refresh the PLC shows as UNKNOWN address:2 187.5 kbps which tells me there is some form of communication. The error comes in the form of:

Masters have been detected on this network. Searching all baud rates is not advisable because a network could occur. To search all baud rates, remove or disable all masters.

Please could someone tell me how to overcome this issue, also what is it referring to as a master??
 
so assumed that establishing communications with the 300 would be similar.

Not even close.... the 300 uses different software and cabling, depends on the CPU but you will be using Profinet, Profibus or MPI, also the software for 200 is MicroWin and you will need Step7 V5.5 or TIA portal (pro) for S7300 PLC's
 

Similar Topics

Hi, I was wondering if someone knows whether it is possible to have a Siemens simatic S7 300 CPU315 and connect it through PPI protocol in stead...
Replies
4
Views
13,314
Hello all. I have an ESA HMI that is connected to a Simatic S7-300 (CPU312). I have uploaded the program from the PLC which is written with Step7...
Replies
6
Views
1,364
Hello. There is a problem with Siemens S7 300. We got a replacement PLC but it does not run the program from the MMC. The new PLC is dated 2011...
Replies
3
Views
661
Hi to all, Our company does not usually use Siemens PLCs, but have a press with one in it. We are trying to change the IP address in our Simatic...
Replies
2
Views
1,040
G'day guys, I am setting up a s7-300 as a test rig for the workshop and when I downloaded the PLC is not going into run mode, I keep getting a...
Replies
35
Views
5,047
Back
Top Bottom