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ET200 Pro Redundancy

Created by: Raednabeel at: 1/28/2010 12:26 PM (11 Replies)

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2/8/2010 1:00 AM	Rate (1)
H-H Platinum Member Joined: 7/2/2008 Last visit: 9/30/2024 Posts: 928 Rating: (309)	Hello Raed, Raednabeel Did you think about your I/O update time? No, how can I know this info. Scan cycle?Communication load? No Online modifications? NO You can find more info on update and cycle time in chapter 16 (S7-400 cycle and response times)in S7-400H manual. What you can read there is definitely useful butwill not be suitable for your configuration because your I/O update time will depend on communication speed between the 2 CPUs (S7400H and S7-300) and cycle time of the 2 CPUs as well. I don't know how to even estimate it. Raednabeel I am not disappointted because the bad design , I am disappointted because my litte experience It should never disappoint you and you should take it as a motive to read more and ask more then you can learn more and more. No one knows everything and and no one wasbornknowing how to play with S7-400. Just give yourself the chance to learn and I must confess that I was happy seeing you asking how to reach infos in this website and I'm pleased that you could get to some manuals about communication yourself(It took me months to get used to this massive site). Raednabeel Please, see the "System Software for S7-300/400 System and Standard Functions" Manual 21.8 & 21.9 , what I understand from these, that I can use them, am I wrong ? Yes and NO. 21.8 is about writing data to a remote CPU using SFB/FB 15 ''PUT". 21.9 is aboutreading datafrom a remote CPU using SFB/FB 14 ''GET". So, Yes you can use these SFBs and FBs but you were asking about totally different things, SFC 14 DPRD_DATRead Consistent Data of a Standard DP Slave / PN IO device. SFC 15 DPWR_DATWrite Consistent Data to aStandard DP Slave / PN IO device. So, NO you can't use these SFCs. Raednabeel Is it mean the total devices that are connected to the cpu, even if I don't use S7-connections with them or the devices are connected via CP ? I have 18 DP slave connected to each other via optical ring , and then connected to the DP port on the CPU ? Also I have 6 "IM 154-8 PN/DP CPU" and 2 x-stations connected through ethernet optical ring then to scalance then to CP. So do I have 26 connections ? I've extracted the following from SIMATIC Manager help. SIMATIC Manager help What is a Connection? A connection is a logical assignment of two communication partners to execute communications. A connection determines the following: The partners involved in communication The type of connection (for example, S7, pointtopoint, FDL, or ISO transport link) Special properties (such as whether a connection remains permanently configured, or whether it is established and disconnected dynamically in the user program, and whether operating mode messages should be sent). If you go back to technical specifications where it's stated that the max. is 16 connections, you can find what kind of connections they mean (e.g. S7 communication, S7 basic communication,..etc.) So, only the 6 PN CPUs and the 2 X-Stations will be counted under connections. What are the X-Stations? Are they S7 CPUs? Don't forget one connection is always there for PG and at least one for OP communication. Best regards. H-H

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2/8/2010 7:42 AM	Rate (0)
Raednabeel Posts: 96 Rating: (7)	H-H What are the X-Stations? Are they S7 CPUs? H-H Indeed I don't know what they are , what I know about them that they are stations existed on the ring, and my system will not deal with them. May they are connected to the optical ring to access the SCALANCE switch and then to PCs. Any way they are not countable in this case. Mr H-H, it is a big chance to deal with expert like you, Thank you
Raednabeel Posts: 96 Rating: (7)
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