7/26/2022 9:24 AM | |
Joined: 3/7/2020 Last visit: 5/27/2023 Posts: 16 Rating: (0) |
hello dears i have a problem to configure s7-400h redundancy when the first cpu (master) is in run mod the other cpu showing fault(external fault) i checked the version of the cpu and the ram size and the program to be exact i have no idea what is the problem that my plc is not redundant ? please help ------------------------------------------------------------------------------------------ |
Last edited by: Jen_Moderator at: 07/26/2022 10:26:16New subject after splitting |
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7/26/2022 7:19 PM | |
Joined: 5/28/2008 Last visit: 9/21/2024 Posts: 4515 Rating: (839) |
Hi, Please give us more details. External fault only triggered or with REDUNDANCY fault or what? Did you accessed the diagnostic buffer? |
Ayman Elotaify |
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7/26/2022 9:14 PM | |
Joined: 9/27/2006 Last visit: 9/28/2024 Posts: 12283 Rating: (2685)
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Hello hamed; On top of the requests from Ayman Elotaify above, it would be ueful to have answers to these questions about your problems: - what model of S7-400H are you using, what version of Step 7 re you working with? - are bth CPUs mounted as per Siemens recommendations? - are the synch modules installed and connected (with the recommended fiber-optic cables) properly in each CPU? What is the status of the LEDs there? - what LEDs are active (on both CPUs) when there is a fault, besides the SF LED? - are the diagnostic OBs designed for the S7-400H system included in the CPU programs? Speifically, OB 70 (I/O redundancy error OB) and OB 72 (CPU redundancy error OB) - please save the contents of the diagnostic buffer on both the primary and standby CPU, using the Save As..button in the diagnostic buffer screeen; post bot files here so we may examine them. As far as documentation we can recommend, start with the S7-400H manual (v6.0), always very informative: https://support.industry.siemens.com/cs/ca/en/view/82478488 Hope this helps, Daniel Chartier |
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