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CP 342-5 as a slave word Length?

Created by: Dufour at: 6/25/2008 6:31 PM (8 Replies)

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6/25/2008 6:31 PM	Rate (0)
Dufour Posts: 23 Rating: (0)	All, I have Cp-342-5 that I want to configure as a slave so that 4 words can be passed from a TI-505 to this master and then read in from the attached S7-317 PLC that the 342-5 is connected to. The problem I have is that the "length" is set to 16 in / out (i assume this is words)and I only want to send 4 words each way, how can I go about configuring this card correctly.
Dufour Posts: 23 Rating: (0)
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6/25/2008 7:40 PM	Rate (0)
JMJ Posts: 487 Rating: (45)	Hi, The 16 byte address you see in HW config is the IO area the CP occupies. It is not your slave data area. This is used for comminication b/w CPU CP over the backplane. Note the starting addresses as they are required for programming When you use CP as a DP slave you have use DP_SEND and DP_RECV communication blocks. They are available under the library in Std Lib->Comm blocks and under Simatic net CP library. The length you define under these blocks will define your slave IO area length. The base address that you get from HW config(Starting address of 16 bytes) is used as CPLADDR paramater. Please refer to manual, Chapter 6 and 8 http://support.automation.siemens.com/WW/view/en/1158693 Best Wishes
JMJ Posts: 487 Rating: (45)
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6/26/2008 2:10 PM	Rate (0)
Dufour Posts: 23 Rating: (0)	What configuration do I have to do to the CP342-5 card to ensure that there are 4 words allocated to that card when it is setup as a slave? I can only fidn the box you check to indicate it is a slave.
Dufour Posts: 23 Rating: (0)
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6/26/2008 2:16 PM	Rate (0)
JMJ Posts: 487 Rating: (45)	Read the manual. Itis not a bad habit. Also as I mentioned above. Yourslave area length is NOT defined it HW config of CP. IT is defined in DP_SEND and DP_RCV
JMJ Posts: 487 Rating: (45)
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6/26/2008 3:30 PM	Rate (0)
Dufour Posts: 23 Rating: (0)	OK, we have just foudn that we had a cabling problem resolved that. Now the CP342-5 is configured as a ACTIVE module and when we plug it in online it kicks off the other passive module already on the network we cannot find the checkboax that the manual refers to for setting it in PASSIVE mode vs. ACTIVE. Any help here would be appreciated.
Dufour Posts: 23 Rating: (0)
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6/26/2008 4:19 PM	Rate (0)
J_Bell Posts: 5822 Rating: (412)	Hello, do you know the operating mode folder in the properties of the CP? See the picture. Best regards J_Bell Attachment Slave-Porperties-CP-342-5.jpg (335 Downloads)
J_Bell Posts: 5822 Rating: (412)
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6/26/2008 5:31 PM	Rate (0)
Dufour Posts: 23 Rating: (0)	What setting should it be setup as I have it as a DP slave and checked and unchecked the Test & comminsioning box.
Dufour Posts: 23 Rating: (0)
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6/26/2008 10:16 PM	Rate (0)
JMJ Posts: 487 Rating: (45)	TI 505 is your DP master and CP342-5 is DP slave. Now, what is your "other passive module"? May be it will help if you give complete network details. There can be compatibity issues.
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6/26/2008 11:09 PM	Rate (0)
J_Bell Posts: 5822 Rating: (412)	Dear gdufour, the DP Slave capability does not depend on being a active or passive node at all. The checkbox only allows you to have a PG/PC accessing the PLC over the PROFIBUS interface, that's it. As already said you need the DP_SEND / DP_RECV Functions prepared with the neede Datalength and that's it. The PLC needs the neede Fault OBs too... and your Slave PLC has to run. Hopefully the manual will support you to solve this situation. Best regards J_Bell
J_Bell Posts: 5822 Rating: (412)
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