7/4/2017 8:13 PM | |
Joined: 9/27/2006 Last visit: 9/10/2024 Posts: 12282 Rating:
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Hello Abdullh;
You are asking us for the differences between Software Redundancy (SWR) and H-Syatems, but you are ready to tell the client that his application can work without problem with SWR? What calculations do you base your decision on? SWR might be a valid solution for your client. Then again, it might not be. You must evaluate the capaities and pricing of each system and the client requirements carefully before proposing a solution. Please take note that: - SWR may take up to 1 sec. to switch over from Primary to Standby CPU (depending on the network connection you choose for the project), while the S7-400H is virtually bumpless (switch in msec). That is because the connection between Primary and standby is through dedicated fiber-optic cables, and the runtime of both CPUs is always active in parallel (in redundant mode) so there is no time lost for the standby to take over the duties of Primary. - SWR does not allow redundancy on the level of I/O, whereas H-Systems does allow redundant DIs , DOs and AIs, voting, and other configurations. - SWR will cost a lot les but will not provide the topologies, reaction time and security of H-Systems. And you will have a lot more programming required to setup and maintain the SWR. Again, please evaluate carefully the requirements of the client's project before you choose one system over the other.and proposing a solution that fits his specified needs. See the following discussion from the forum for more details. software and hardware redundancy in siemens As far a using Profinet I/O with SWR, this is not allowed. See these links: S7-300 REDUNDANCY USING PROFINET Hope this helps, Daniel Chartier |
Last edited by: dchartier at: 7/4/2017 11:03:30 PM |
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4/19/2018 11:30 AM | |
Joined: 6/19/2017 Last visit: 9/6/2024 Posts: 8175 Rating:
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New question published by AutoGen_3451117 is split to a separate thread with the subject Redundant systems: Siemens and ifm. Best regards |
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