2/8/2010 1:00 AM | |
Joined: 7/2/2008 Last visit: 8/26/2024 Posts: 928 Rating:
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Hello Raed,
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.
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
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.
I've extracted the following from SIMATIC Manager help.
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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