Definition
MBS standard work manual's andon rules: test NG 30 minutes 2 pieces, same batch damaged 2 pieces, takt deviation 10%, material supply abnormality—four trigger conditions; yellow light stops line to call team leader and supervisor, red light stops line requiring external support; light off condition is record update. Error-proofing has three levels, error-prone stations must reach level two or above. Not a DBS standard.
In detail
DBS Andon only provides escalation chain and response time limits; MBS adds "what counts as an abnormality"—four trigger lines written as numbers, all automatically determined from scrap, batch, cycle time, and shortage records. Light-off is tied to "production line record + change management board updated" to avoid turning off the light just because the problem seems resolved. Among three-level poka-yoke, level one is a prompt, level two is an alarm, level three is prevention; the QEP map selects error-prone stations from maintenance and inspection data to achieve level two or above.
Example in practice
A line produced 2 defective pieces within 30 minutes of testing NG; ABS triggered the first rule to alert the team leader to press the yellow light; after the sub-leader handled the issue, they updated the production line record and wrote on the change management board; the system verified both records existed before closing the event.