4/3/2020 12:20 PM | |
Joined: 3/5/2014 Last visit: 8/5/2022 Posts: 5521 Rating: (1054)
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hi, To project a Fail-Safe System you need a SW to project it. In the "classic-world" you need to work with Distributed Safety for S7-300 or F-Systems for S7-400FH: S7 F Systems V6.2 Released for DeliveryAlso have a look to the manual of F-Systems: SIMATIC Industrial software S7 F/FH Systems - Configuring and Programminghope this helps, regards, |
FCK WAR! |
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4/3/2020 12:20 PM | |
Joined: 9/9/2015 Last visit: 9/15/2024 Posts: 727 Rating: (278) |
Dear Autogen, For redundant design, you need to read a lot. What I could say is, not that easy and straight forward. Let me give you an ideas, 1. Redundant Power supply, you have to look at siemens power supply architecture, there is a manual for it. For mine, I use two sets of Power supply + 1 redundancy power supply module for power up the equipment for equipment set A. Another sets of power supply + redundancy module to power up set B. Another set of power supply to power up the io module front connector IO. Choosing a model could take some times. So I have 3 sets of (2 power supplies + 1 redundancy module to combine 2 become 1). When one power supply failed, redundancy module will give alarm to HMI. The system will only failed when both redundancy modules failed at the same time. 2. Redundant CPU, Rack 0 connect to power source A and Rack 1 to power source B. 3. IO module - Same. A to power source A, B to power source B. 4. If you need redundant IO, redundant DI, redundant DO , you need Marshal terminal Assembly(MTA). When one failed, another module take over. 5. Terminal bus redundant, you need to separate two LAN. you need PRP , purchase IE RNA for that. Some of the stations might not support IE RNA, you need to purchase X204RNA. 6. Plant bus redundant, you will need to configure standby redundancy in scalance. 7. Scalances redundant, purchase everything two sets. 8. Network adapter configuration, two sets. 9. CPU CP card, two sets. The engineering for a redundant system is quite difficult. Please read up more first to determine what level of redundancy you required. I hope this information gave you an idea of redundancy. |
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4/6/2020 12:03 PM | |
Joined: 9/9/2015 Last visit: 9/15/2024 Posts: 727 Rating: (278) |
Dear AutoGen_8144853, Your hardwares seem okay, but it depends on the level of redundancy you want. When you drafted out your architecture , and look at the system, ask yourself "if this hardware failure, will the system still run" , then you will get the answers. Sometimes, you might have multiple point of failures, and I depend on the number of failures you can tolerate and you should define them clearly in your functional design spec to avoid misunderstanding between customer and you. As I said, redundant system can be quite expensive. Here attached a link for IM level redundancy for your study. onfiguration of Redundant I/O Modules in SIMATIC PCS 7 . Then, the next level of challenges will be "if your modules failures" will you get a notification in HMI and will action be taken once failures detected? This is somethings need to plan out during design stage. Then this link Standard Architecture, for your bed time story. There are quite a number of redundant configuration such as network and power supply, written in this manual which is quite useful for you too. Your may take a look. Hope these are helpful for you. |
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4/7/2020 5:11 AM | |
Joined: 9/9/2015 Last visit: 9/15/2024 Posts: 727 Rating: (278) |
Dear AutoGen_8144853, If we look at the redundant CPU part, the CPU is in redundant, so this is okay. Then we look at PS407, you can choose to provide two PS407 for each rack, rack 0 plc and rack 1 plc. If you do so, please ensure the PS407 A and PS407 B are coming from different source of power. But if you consider to have redundant Sitop PSU, then I think you do not need a redundant PS407 anymore. Means you can use one unit of PS407 enough as they are redundant already. If you failed this and that at the same times = multiple point of failures. My suggestion is redundant PSU, single PS407, redundant CPU, redundant IM, redundant OLM. If you have PLC to PLC communication which is critical, please consider redundant Plant bus, redundant Communication processor. If you must ensure your operator HMI running smoothly, no down on any single client or server allowed, consider redundant terminal bus and redundant NIC card. Hope this is helpful for you.
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