1/24/2013 6:45 PM | |
Posts: 3 Rating:
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Hi All, I amattaching a Block diagram.pdf file hoping thatmy questions are understood clearly and answered appropriately. The attachments contain two diagrams, where the second one is a magnified view of focused components in question. We are using the following in the Box "Siemens S7 PLC"(RTU): Step 7, CPU 315-2 PN/DP, SM321 32x, SM322 32x, CP341. My first question is: Q1: Astream of bytes need to be exchanged betweenthe "RTUCI task" and the "Ebilock 850" (end device). So, when a typical byte stream say, 0x67, 0x89s received by the RTU from RTUCI task, will it transmit 0x67 and 0x89 to "Ebilock 850"through CP341 (RS-232 cards),OR will it transmit 0x36, 0x37, 0x38, 0x39 (where 0x36 is ASCII code for 6,0x37 is ASCII code for7, and so on), in case ASCII protocol is selected for CP341? My other questions are: Q2: We are required touse Modbus TCP/IP between "RTUCI task" and RTU. Can we do this, where we are required to use ASCII between RTU and "Ebilock 850"? Q3: As seenin the block diagram, there are two kinds of end devices connected to the RTU ("Ebilock 850" and "Relat Interlocking"). The RTUCI task has two different station objects called "Ebilock Station" and "RI Station" that can independently take care of the what messages they need to exchange with RTU, with regard to those two end devices. The plan is to use two TCP connections with RTU (one for communicating messages related to "Ebilock 850", and the other communicating messages related to "Relay Interlocking").The two TCP connections would use same IP address, but different ports on the RTU. So, the question is: Can the RTU application be written to support this use case, in particular, communicating with RTUCI over two TCP connections? Q4: If the usecase mentioned in Q3 is possible, can we use ports 502 and 3050 to distinguish the two TCP connections? Awaiting for your expert replies, Thanks. AttachmentBlock diagram.pdf (157 Downloads) |
1/25/2013 5:21 PM | |
Posts: 3 Rating:
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Hi Kaulquappe, Thanks for your reply. I guess, you are trying to say "Yes" to both of my follow-up questions to Q1 and Q2, correct? Thanks, curiosity |
1/25/2013 6:11 PM | |
Posts: 3093 Rating:
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Hello Curiosity, I meant "yes" to both of your questions. Regards, Kaulquappe |
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