8/3/2013 2:53 PM | |
Joined: 7/2/2008 Last visit: 9/30/2024 Posts: 928 Rating: (308) |
HelloYogendraG,
No, this module will not work in redundancy mode. You can't find redundancy tab in hardware configuration. If you really need to use this module, you can make your own redundancy algorithm. Just write to the 2 modules instead of writing to one module. It's very simple in redundant digital outputs. In the 400H manual, you will find a list in Chapter 13.4.1 (Signal modules for redundancy). Best regards, H-H
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8/4/2013 8:37 AM | |
Joined: 11/9/2008 Last visit: 10/15/2024 Posts: 410 Rating: (6) |
Hi H-H, Thanks for your reply. Can you explainredundancy algorithm? I don't understand. Please explain me. Give me some example. Regards, Yogendra. |
8/4/2013 2:56 PM | |
Joined: 7/2/2008 Last visit: 9/30/2024 Posts: 928 Rating: (308) |
HelloYogendraG, You can read more about the algorithm in chapter 13.5 (Other options for connecting redundant I/Os) in the above linked 400H manual. In brief, the use of the redundancy algorithm is to detect the 2 below things to take the correct (pre assigned) decision. 1- Wrong input measurement or input measurement discrepancy like comparing 2 analog input signals and taking the higher measurement (correct decision) if there's a difference of 10% for some seconds. In this case the user program will depend on the higher measurement and will put it in the lower memory address. In your program, you always use the lower module address. If IW512 is redundant to IW712, you always use IW512 since the algorithm will always put the correct value in the lower address. 2- Detect channel failure or module failure. If a module/channel fails the CPU passivates/ignores this channel/module and take the measurement of the healthy one and put it in the lower memory address. For digital inputs, it's still the same. The algorithm detects discrepancy and channel/module fault to take the correct decision. For analog outputs the the required value of mA is generated by the 2 redundant modules (each module gives half of required mA). So, it is very important for the algorithm to detect the channel/module fault in order to produce full value from a single module. For digital outputs (which is your case) there's no real algorithm. The program just generates the 2 outputs every scan. If a module fails, the output is still generated from the other module. You can simply do that by moving the output words of the 1st module to the output words of the redundant module every scan (move QW512 to QW712). However, It's still important to detect the faulty module just for alarm generation. Best regards, H-H
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5/23/2014 1:40 PM | |
Posts: 73 Rating: (6) |
Hi, Please refer attached document. Regards, Krrish !! AttachmentM:\MANUALS_DUMP\wiring_red_IO_en.pdf (386 Downloads) |
Last edited by: Krrish !! at: 5/23/2014 1:41 PM |
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