connect cp342-5 to et200m and my headache

unclehamid · May 23, 2009

God help me!!! I wish I 'd bought a cpu313c-2dp
but you know some times you made mistake

I have cpu 312c +cp342-5 I want to read and write in et200m
can someone give me an example program for doing this
cpu 312-5be03-0ab0 cp 342-5da02-0xe0

et200m:
im153-1aa03-0xb0 DI 321-1bh02-0aa0 do 322-1bh01-0aa0

ArikBY · May 23, 2009

To communicate with remote I/O you need DP Master .
According Siemens catalog:
"6GK7 342-5DA0x-0XE0
CP 342-5 as PROFIBUS DP Slave"

I think you need different card.

dchartier · May 23, 2009

Hello Unclehamid;
The configuration of the CP 342-5 as a DP master to an ET 200M (for example) is almost the same as the one you would have dopne with an integrated DP master port.
The main difference comes when you want the CPu to access the Profibus-DP data. It is not automatic, you must use special functions FC1 and FC2 (DP-Send and DP-Recv).
Look at the following FAQ on the differences between the CP and the integrated DP ports:
http://support.automation.siemens.com/WW/view/en/21628388
Follow the proposed link and look up FC1 and FC2 descriptions.
They are also explained here:
http://support.automation.siemens.com/WW/view/en/28923457

Hope this helps,
Daniel Chartier

unclehamid · May 24, 2009

dear daniel it was really useful and it works
as I find from that page we use fc1(send)or fc2(recive)to send data to cp342-5 or recieve from it but I didn't find out how we assign memory of cp 342-5 to a specified dp(for example I have et200m(16di/16do) with "55" dp address )
if I had several dp what would happend. in bellow pic how we assigned dbb10-dbb19 to slave 2

dchartier · May 24, 2009

Hello UncleHamid;
I am sorry to say that the picture you have inserted does not appear correctly, so I am unable to understand your question properly. Did you use the "Attach files" button available on your reply page?
In the meantime,based on what I feel is your concern, I can suggest the following FAQ discussing the use of FC1 and FC2 in your program. All points are important, but I suggest you look especially at point 5: Data communication beteen CPU, CP and slaves, and the Programming Recommendations you find at the bottom of the document.
http://support.automation.siemens.com/WW/view/en/18208090

Once your exchange between the CP and the CPU have been properly done using FC1 and FC2, you can transfer the data from 1 slave from your Recieve_DB (chosen by you in FC2) to any DB you desire, using SFC20("BLKMOV") for example.
Hope this helps,
Daniel Chartier

unclehamid · May 24, 2009

dear daniel this pic related to
your suggestion link :
http://support.automation.siemens.c...lib.csinfo&lang=en&objid=28923457&caller=view

by fc1 we send some data to cp342-5 but we don't specify this data will go to which dp address if I had several dp slaves
what would happend

JesperMP · May 24, 2009

With DP_SEND and DP_RECV you transfer the i/o data from the entire i/o image. You dont have to worry about different DP stations addresses. It is all the same i/o image.
The various DP slaves simply have to be setup in the HW Configuration. The CP then will take care of exchanging the i/o data with the configured DP slave stations.

ArikBY · May 24, 2009

Hi Jesper

What about the speed?
It stay a same.
If Its work like DP Master,what the different between Master and Slave?If both of them can initiate communication.

JesperMP · May 24, 2009

Hi Arik.

The CP 342-5 (6GK7 342-5DA02-0XE0) can work as either master or slave.
In this application it must be master because it controls the ET200M DP slaves.
I think you have missed that the CP342-5 is in the rack with the 312C.

A slave can never initiate comms. It waits for the master to query, only the does it respond.

dchartier · May 24, 2009

Hello Arik;
As Jesper pointed out, the CP 342-5 may be setup as master or slave on the Profibus-DP network.
Maybe the catalog extract you are quoting is incomplete. Here is a link to the Product Description for the CP 342-5 from the A&D Mall, the Siemens electronic catalog:
https://mall.automation.siemens.com...0053&mlfb=6GK7342-5DA02-0XE0&aktTab=4&lang=en

The Functions tab is very clear about master and slave capabilities of the CP 342-5.

However, that is between the CP and the Profibus network, where the CP 342-5 acts autonomoulsly.. Between the CP and the CPU, you must use asynchronous exchange functions DP-Send and DP-Recv over the backplane connections to transfer the data to/from the network (in the CP) to the CPU memory. This is the issue UncleHamid is trying to deal with.

Hope this helps,
Daniel Chartier

unclehamid · May 25, 2009

thanks all of you
as I found out until now cpu send data by fc1 to an image table in cp342-5 or recieve data from that table by fc2 but data in this table is related to I/O address of each slave
for example in my et200m(byte 0,1 input and byte 0,1 output are assigned)if I had an et200m with (byte 100 output it was related to byte number 100 of cp342-5 image table)

ArikBY · May 25, 2009

Hello Jesper&Daniel

Thanks for your answer.
What confused me,when I went to the Step 7 hardware configuration
"6GK7 342-5DA0x-0XE0
appear as
CP 342-5 as PROFIBUS DP Slave"
From my previous experience master should call DP Master.
With IM-151-8 that the name of the unit.
It seems I have a lot to learn with Siemens.

Thanks for widening my knowledge.

JesperMP · May 25, 2009

I have added this nifty "tips regarding using DP i/o via a CP342-5".
It explains these things that Siemens do not explain so well.

unclehamid · May 29, 2009

JesperMP as usual it was graet
thank you very much

imanh · Jul 18, 2009

I have the same error. but meanwhile configuring BF and SF flashes! what's the problem?

connect cp342-5 to et200m and my headache

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