Hello, One of my customer reported that his X20BC0088’s Mod Status LED is blinking red. The help shows that this status means there is a “Major recoverable fault” happened in the module. Therefore, I would like to ask what kind of fault can be considered as a “Major recoverable fault”? [image]

Hello Junru, if the Mod Status LED is blinking, it means the bus coupler is not yet configured. What is the address switch set to? Which I/O modules are connected to the right of the bus coupler? Is automatic or manual configuration of the I/O modules being used? You can find more information a…

Description of Major Recoverable fault for X20BC0088

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kovarj (Jaroslav Kovar) December 17, 2025, 2:10pm 3

Hello @Junru_Pan , have you found usable solution for you, can you update us?

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Description of Major Recoverable fault for X20BC0088

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