By either of following methods: (MR-J4)
1. On MR Configurator2, select [Diagnosis] - [Alarm Display] - [Clear].
2. Set alarm history clear of parameter to "0001".
(Type A: PC18, type B: PC21)
When alarm history clear is enabled, the alarm history is cleared at next power-on.
After the alarm history is cleared, the setting is automatically disabled, "0000”.