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The Communication between CP342-5 and EM277

Created by: New_Bird at: 1/2/2008 10:45 AM (5 Replies)

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1/2/2008 10:45 AM	Rate (0)
New_Bird Posts: 17 Rating: (1)	Dear all, I have a CPU315-2DP with CP342-5 (6GK7-342-5DA02-0XE0)as a Master would like to get some data(Q-address) from a s7-200 EM277 profibus-DP. Questions: 1. Do I have todo any modification on the S7-200? 2. I understand that I have to use FC1 DP_SEND and FC2 DP_RECV when the CP342-5 configured as master, but in my case, I just want to recieve data from EM277, do I still have to use FC1 DP_SEND? 3. Total of EM277I going to linkare 42 units, Can it be donebyonly1 CP342-5? Millions of thanks.
New_Bird Posts: 17 Rating: (1)
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1/2/2008 1:42 PM	Rate (0)
Wizard Diamond Member Joined: 4/24/2006 Last visit: 1/17/2025 Posts: 8807 Rating: (1173)	Hello New_Bird, Here are some answers: New_Bird I have a CPU315-2DP with CP342-5 (6GK7-342-5DA02-0XE0)as a Master would like to get some data(Q-address) from a s7-200 EM277 profibus-DP. Questions: 1. Do I have todo any modification on the S7-200? In hardware configuration, you will use a GSD file. Here you define how much you want to communicate and you define an offset address of V-memory in S7-200. The master (CP342-5) will write data to V-memory in S7-200. So in S7-200 you should read the right V-memory. New_Bird 2. I understand that I have to use FC1 DP_SEND and FC2 DP_RECV when the CP342-5 configured as master, but in my case, I just want to recieve data from EM277, do I still have to use FC1 DP_SEND? No, you don't have to use DP_send. New_Bird 3. Total of EM277I going to linkare 42 units, Can it be donebyonly1 CP342-5? The CP342-5 can handle 124 slave's. But remember you can use a max. of 31 slave's in one segment. So you will have to use a Repeater. Best regards, Wizard

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1/3/2008 5:38 AM	Rate (0)
New_Bird Posts: 17 Rating: (1)	Hi Wizard, I think I know what should I do d.. Thanks!!
New_Bird Posts: 17 Rating: (1)
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1/3/2008 8:54 AM	Rate (0)
Wizard Diamond Member Joined: 4/24/2006 Last visit: 1/17/2025 Posts: 8807 Rating: (1173)	You are welcome Best regards, Wizard

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1/16/2008 11:09 AM	Rate (0)
New_Bird Posts: 17 Rating: (1)	Hi Wizard, I went to the sitein malaysia last few days. And I failed to link up theS7-200 with my Master CPU. I don't have the right toexcess tothe S7-200 PLC, is there any other configuration need to be done on it? The offset address of V-memory in S7-200 has set to 4000, and each unit have total of 40 bytes (VW0 to VW39)sending to the Master. Due to the maximun lengthfor DP Masteris 2160 bytes for 1 CP342-5, I cant use the default hardware config of <32 word In / 32 word Out> module to add in 42 units. The maximun units I can add are 33 units(33 x 64bytes = 2112 bytes). Therefore, I modified the CP342-5's GSD file to added in 1 more selection which is <20 word In / 20 word Out>, so that I am able to add in all units with total of 1680bytes. I modified it thru NotePad, will this work? Because next week I will go there again, only thenI can test out. On Master, I had done the DP-RECV parameters as below: CPLADDR:=W#16#0110 RECV:=P#DB1.dbx0.0 byte 1680 NDR:=M 70.0 ERROR:=M 70.1 STATUS:=MW 71 DPSTATUS:=MB73 1. The address and length we enter in RECV is the address area which we going to store the data or is the address area we calling the data from? 2. If it is the address we going to store the data, how's the sequence of data recieve? Let say the 42 slaves have the profibus ID from 10 to 51, would the ID 10 storeat first 40 bytes and the ID 51 in last 40 bytes? Thanks.
New_Bird Posts: 17 Rating: (1)
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1/16/2008 3:19 PM	Rate (0)
Wizard Diamond Member Joined: 4/24/2006 Last visit: 1/17/2025 Posts: 8807 Rating: (1173)	Dear New_Bird, I'm going to try to answer. New_Bird Due to the maximun lengthfor DP Masteris 2160 bytes for 1 CP342-5, I cant use the default hardware config of <32 word In / 32 word Out> module to add in 42 units. The maximun units I can add are 33 units(33 x 64bytes = 2112 bytes). Therefore, I modified the CP342-5's GSD file to added in 1 more selection which is <20 word In / 20 word Out>, so that I am able to add in all units with total of 1680bytes. I modified it thru NotePad, will this work? Because next week I will go there again, only thenI can test out. I suppose you have CP342-5 as master , so you use GSD file for EM277. When you insert an EM277, you will have to insert Inputs and Outputs. I suggest you insert an 'Universal module'. Double click on it and you can insert In- and Outputs (20 word in and 20 word out) New_Bird On Master, I had done the DP-RECV parameters as below: CPLADDR:=W#16#0110 RECV:=P#DB1.dbx0.0 byte 1680 NDR:=M 70.0 ERROR:=M 70.1 STATUS:=MW 71 DPSTATUS:=MB73 1. The address and length we enter in RECV is the address area which we going to store the data or is the address area we calling the data from? This is the location where you store data from S7-200 New_Bird 2. If it is the address we going to store the data, how's the sequence of data recieve? Let say the 42 slaves have the profibus ID from 10 to 51, would the ID 10 storeat first 40 bytes and the ID 51 in last 40 bytes? Thanks. Pleas have a look at following faq: http://support.automation.siemens.com/WW/view/en/18208090 See point 5 Best regards, Wizard

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