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< BFLT ERR @31> happens, when used indirect MB or MI addressing, and address is out of range, supported by PLC (include negative value).

For example, MB range is from 0 to 255. MI to MB conversion starts at MB250 and it converts 8 bits.

Last 2 bits will be out of range 255 for MB.

Please add Ladder code to check indirect addressing range.

 

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