2/16/2017 8:20 AM | |
Posts: 77 Rating: (3) |
Hello Lina_732 I already have PLC 1 (CPU315) and now I am planning to employ PLC 2 which can be any of Siemens (compact due to space restriction) PLC. If I use IM-151 as second master will it wok?
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2/16/2017 11:54 AM | |
Posts: 77 Rating: (3) |
Hello ChristophD Thanks for your suggestion. Today I have CPU315 and on the main rack I have all IO's. I have to add one PLC as Master to get data from Slaves. Your proposal is not an option to go with. |
2/16/2017 11:59 AM | |
Joined: 5/12/2006 Last visit: 9/23/2024 Posts: 22367 Rating: (3012) |
Hi, must PLC1 and PLC2 get the slave data on the same time ? ->if yes = no solution possible
Christoph |
2/19/2017 11:17 AM | |
Joined: 12/22/2006 Last visit: 1/25/2022 Posts: 1742 Rating: (308) |
Hello, I would investigate if using SFC12 (enable/disable DP slave) is not an option for you. There are several challenges here: - Another point is that the switching between PLC1 and PLC2 is not bumpless. - During the time PLC2 was inactive, the inputs in PLC2 had the status 0. - PLC2 is not aware in what status the program was in PLC1 when taking over. - same remarks when PLC1 comes back to life and you swap back from PLC2 to PLC1. - may be that I also forgot something that you will detect by testing. |
Best regards |
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