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Reading 104 bytes at a time using OPC server,S7 200 and CP243-1

4/29/2008 11:46 AM	Rate (0)
kasun Posts: 28 Rating: (1)	Hi guyz, I need to communicate through OPC server and send 104 bytes at a time. I use a cpu 224 with cp243-1. Is there memory range other than bit memory(M0.0 to M31.7) which can be acessed through OPC server.Using bit memory only 32 bytes can be acessed through OPC server. How can I acess 104 bytes at a time through OPC server. I saw in manual that only following memory locations can be read using an S7 connectionin the OPC server. I Input Q Output PI \|Peripheral input PQ Peripheral output M Memory bits T Timers C Counters It was mentioned in the manual "SIMATIC NET Industrial Communication with PG/PC". (6GK1971-1GA00-0AA1) page 211. In that manual under the topic "Buffer-oriented Services" it is mentioned that "Up to 65534 bytes of payload data can be transferred regardless of the size of the PDU". The syntax used for receiving is "S7:[<connectionname>]BRCV,<RID>{,{<type>}<address> {,<quantity>}}". (Page 214 of the manual) But I found this little confusing. Can this be used with S7 200. If this can't be used can anybody tell me how to read 104 bytes (eg.VB0 to VB103) using S7200 and CP243-1 through OPC server (I'm using a client build using VB, I only need the item ID to be used in that client to acess 104 bytes a time ).If there is an alternative ay please mention that also. Thanks for reading
kasun Posts: 28 Rating: (1)
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4/29/2008 12:21 PM	Rate (0)
J_Bell Posts: 5822 Rating: (412)	Dear Kasun, I am sorry but BSEND/BRECV Functions can not be used with the S7-200, because the S7-200 has to run BRECV or BSEND Functions to allow this but this is not possible. So what you can do is PUT / GET from the remote onto the S7-200. This allows you also to PUT or GET the 104 Bytes you want to exchange. The only thing in the VB area within the S7-200 is that this area is called DB1 within the OPC Server. Please check the following FAQ to see what to do: How do you address variables areas of the SIMATIC S7-200 CPU via the SIMATIC NET OPC Scout? Best regards J_Bell
J_Bell Posts: 5822 Rating: (412)
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4/29/2008 4:29 PM	Rate (0)
kasun Posts: 28 Rating: (1)	Hi, It works,Thanks a lot
kasun Posts: 28 Rating: (1)
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