Siemens CPU928B

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• May 20, 2010

• #1

I am looking for communication information for a CPU928B for a S5 135U. There are 2 remote racks with S5 ET100U and there was a computer operator interface station. I need to replace the computer operator station but I cannot find what communication protocols are available.

 

PeterW

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• May 20, 2010

• #2

S5 manuals on Siemens site

http://support.automation.siemens.com/WW/llisapi.dll?func=cslib.csinfo〈=en&siteid=cseus&aktprim=0&extranet=standard&viewreg=WW&objid=10805127&treeLang=en

 

nonuke

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• May 21, 2010

• #3

Is the PC connected to the CPU or to a CPXXX like CP524 in the S5-135U rack?
The ET100U should be communicating in Sinec L2-DP now called Profibus-DP

 

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• May 21, 2010

• #4

Going off of memory I believe the communication port used was the bottom serial port of the CPU928B

 

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• May 21, 2010

• #5

Thanks for the link on the manual. I'm not ready to start digging into the finer points of making it communicate. I am just curious as to what the communication protocols are so I can see what HMI options I have that will talk to it. Thanks

 

Manglemender

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• May 22, 2010

• #6

The bottom port on the CPU would be a TTY port so comms would have been by AS511 protocol over a TTY connectecion. TTY is a current loop interface that would normally have been implemented via an RS232 - TTY convertor.

Nick