[?]: Siemens PPI Protocol description notes/spec.

[jhanus]

Greetings,

can anybody post/upload PPI Protocol description notes/spec here or send it to mail: electronicsmith(at)gmail.com

MPI/Profibus would be great too.
Thank you

[Umencho]

Hello
About PPI Look at manual, see appendix A for pinout:
http://support.automation.siemens.com/W ... en/1109582

About MPI/Profibus Look at part 6.3 of
http://support.automation.siemens.com/W ... n/14053309

- MPI is PROFIBUS based and is using the regulations of PROFIBUS too... So you have max. 256 Byte long telegrams with Header and Taylor like PROFIBUS.

- PPI is RS485 based and closely to PROFIBUS but due to the smaler performance for Communication the PPI Telegramm can contain gaps within the Data... so you have usually no defined Telegramlength like you would need it for PROFIBUS. Due to this MPI and PPI do not work together.

regards

[jhanus]

Thank you for information, but I was thinking about detailed specifications about (PPI)OSI layers and how and when which bytes are sent and which information they carry.

Like TCP/IP is defined and widely known, which and with what purpose is every byte sent.
Sorry if I'm a bit unclear, my main concern is PPI protocol.
Thanks

[Umencho]

Hello
You have just one easiest way to get this information (of course if this info exist for public world ) go Google sea.
regards

[jhanus]

I'm aware that PPI protocol is kept secret, but I'm a student, neither do I have time or enough knowledge to make anything to represent a threat.
My goal is to make a application which could communicate with PLC, and to make my own basic library.
THX

[marcs7]

use this PC access

[jhanus]

use this PC access

I could, but I want it to be stand alone application.

[inwestor]

http://www.runmode.com/usefulstuff.html