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| 7/16/2009 7:49 PM | |
Joined: 7/2/2008 Last visit: 8/26/2024 Posts: 928 Rating:
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Hello, 1st Redundant I/O's can't be configured in ET200iSP. The supported solution for redundant I/Os isusinf ET200M modules. 2nd If you are going to write your own code for I/O redundancy and insist to make it with ET200iSPthen it depends on both of module and transmitter you have. 1- If you have ET200iSP module suitable for 4 wiretransmitters AND 4 wire transmitter thenit might be possibleto connect both redundant channels in a serial way with appropriate zener diodes. I'm not sure this is suitable for ET200iSP butthere's a similar technique forET200M modules. Check the attachment and revise this solutionwith technical support. 2- If you have ET200iSP module for 2 wire transmitters (your transmitter will be IS 2 wire for sure)then the only way isto use a splitter or abarrier. Thisbarrier will supply the transmitter with IS power and transfer current measurement into 2 isolated output channels. This kind of splitters (Barriers)is available from P+F, MTL and many others. Best regards. H-H AttachmentRed AI with Zener.pdf (240 Downloads) |
| 7/17/2009 2:35 PM | |
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Joined: 7/2/2008 Last visit: 8/26/2024 Posts: 928 Rating:
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Hello RoySamia,
This question should be asked to Siemens not me ET200iSP is a very good solution and saves both money and engineering time but it would have been much better if it supported redundant I/O's. However since the I/O redundancy solution (Of SIEMENS)depends on software blocks then it's still possible to build your own blocks for I/O redundancy in ET200iSP. To know about redundant I/O's, please check chapter 10 (10.5.1) in S7-400H manual.
As I told you I don't know if this solution works for ET200iSP or there's a restriction I'm not aware of. But in principle modules must be configured for 4 wire transmitters in this case. In a word, you should use barrier with 2 output channels. Best regards. H-H |
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