Cascading relationship between ALM ports

ALMO1 and ALMO2 ports have the same definition, and they are used for output and cascading respectively. ALMO3 and ALMO4 ports have the same definition, and they are used for output and cascading respectively. For example, if the ALMO1 port is used to output alarm signals, the ALMO2 port can be used as an alarm/cascading port and be connected to an ALMO1 port in another subrack.

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