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Comminucation between MM440 and CPU315 by using CP342-5

6/27/2008 7:30 AM	Rate (0)
sado19 Regular Member Joined: 6/26/2008 Last visit: 12/29/2023 Posts: 6 Rating: (0)	Hi, I want to comminucate 3 Micromaster 440 and CPU315 by using CP342-5. I have done necessarry hardware setting and adressing for the CP and MM440. Can you Please give me anidea about programming as a backbone.As you know when I use CP342, I have to use DP_SEND and DP_RECEIVE blocks for communicating over profibus. I will send and receivedata from/to all MM440. but I can'not call twice or three timesthis function Blocks(DP_SEND, DP_Receive ) from the OB's. What must I doto call them cyclically. and if it is possible can you send me asmall programming example about this. thank you for your help.. best ragards.. sadettin

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6/27/2008 9:56 AM	Rate (0)
J_Bell Posts: 5822 Rating: (412)	Hello, how about this Sample: DP link of CP 342-5 (slave and master) with STEP 7 V5.1 I hope it will help you to get your system running. Best regards J_Bell
J_Bell Posts: 5822 Rating: (412)
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6/27/2008 2:24 PM	Rate (0)
JMJ Posts: 487 Rating: (45)	You do not have to call DP_SEND and DP_RCVthree times. These blocks are not to send/receive data with slave. (i.e DP_SEND is not used to send data to a particular save). It is used for send/receive data between CPU and the dual port RAM of CP. CP handles the communication between DP mater and slaves in its own cycle without any PLC user code. So best is to configure all the slave IO areas in consecutive areas and then use 1 SEND and 1 RCV calls for the whole input and output area. Please refer to the FAQ http://support.automation.siemens.com/WW/view/en/18208090 Section 5 really addresses your question. Hope it is clear now.
JMJ Posts: 487 Rating: (45)
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