IPAD <-> communication

[eatualive]

hello people,

i want to create a demotica system using a s7-315 cpu with ethernet.
for controlling and visualizing i want to build an iPad app that can directly communicate with this siemens CPU. I know some apps exisits in the app store but i want to build my own.

My only problem is i need to setup a ethernet communication to the siemens CPU to read or write data. I was wondering if there is some handbook of how a tcp or udp connection is established with a cpu from siemens? It's not about the code itself although that would be very helpfull. But information how it has to work in general should be fine. The programming i will manage myself.

Anyone know something exist like this?

 

[Mark-]

Hello,

The protocol is not published. You can find a few implementations on the web that you can gather information from. One is named "libnodave".

You can also use a program that can communicate with the PLC and Wireshark to look at packets.

 

[eatualive]

I see, i will have a look in libnodave. but i'm wondering then how all those other companys make there drivers. Or can they get a licence from siemens to get driver for communicating.

 

[Mark-]

Hello,

I have heard, but I do not know if it is true, that licensing something from Siemens might be possible, for a large sum of money.

> but i'm wondering then how all those other companys make their drivers.

Same way as above, by reverse engineering the protocol. A very common practice for unpublished protocols, file formats, data formats, etc..

 

[PLC]

All the pn CPUs have built in web pages and can be customized
Just go to YouTube
Then connect to it with any browser... iPhone ..etc

 

[eatualive]

I know but i want to write a scada like app for my home. So the web page is not what i look for.

hmm, i guess i will try to see if i can convert libnodave to the ipad.
Thanks for the information.

 

[ndzied1]

This may be what you are looking for:

http://www.sweetwilliamsl.com/iweb/smhome