Omron VS mini J7 User Manual page 79

A setting range check and matching check for the written-in constants are
executed after the constants are written from the digital operator to the
inverter. If any constant error is found, the written constants are discarded
and the constants stored before writing are restored.
When a setting range error is found, the constant No. where an error occurs
is indicated by blinking.
When a matching error is found, OP ? (?:a number) is indicated by
blinking.
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