[Cause]
There are many unread alarm notifications. A possible cause is that the alarm notification interface function is enabled but there is no KAREL program to read the alarm notifications. Storing unread alarm notifications reduces memory, so each alarm notification must be read when it is issued.
[Countermeasure]
To render the alarm notification interface functionality ineffective, set the system variable $PNIO_CFG2.$USHORT4 position of 2,3 to 0. For example, when $PNIO_CFG2.$USHORT4 is 63(0x3F), set to 51(0x33). To make changes effective, the power supply needs to be reconnected. Or create a KAREL program to read alarm notifications.