S7-300 connections

[katratzi]

First question:

Can more than one person with the program go online with
an S7-300 cpu at the same time?


Second :

Can the MMC card store the program descriptions (comments,
parameter names,etc.) and does the MMC get updated every
time a change is made and downloaded to CPU?

 

[Mike Dyble]

Can answer your first question.

Yes with certain exceptions/warnings

You cannot both edit the same block (obvious maybe). The second person will get an error message, forget what it is, but I did try this on an S7-400 about a year ago, just to confirm what actually happens.

If you are using MPI/Profibus remember to change the node number of the second programmer, the default is zero, and you cannot have 2 devices with the same node number on a network.

If you are using MPI update time will a little slower (but its hardly noticable)

I actaully made up a Y cable for the project where two of us were commissioning at the same time. It worked fine.

Mike

 

[katratzi]

O.K., thanks Mike.

We will also have two guys accessing at the same time- one through

the MPI/USB, the other will pug into the local ethernet switch.

 

[Jan R]

Debuggen on S7-300

Can answer your first question.

Yes with certain exceptions/warnings

/QUOTE]

I have had the same problem and siemens sad it is not possible for the S7-300

Jan

 

[moggie]

Have a look at the "T Connector". This gives you two PG interfaces from the PLC. However as already stated there is no "common" access to the same block/variable in the PLC Program

http://www.traeger.de/