Mitsubishi Electric AE-200A Service Handbook page 18

[III System restrictions and notes]
(4) When there are 51 or more air-conditioning units (apportioned electricity billing function is not used and M-NET transmission of the
AE-200 is not used)
Up to 200 air-conditioning units can be monitored and operated by connecting an AE-200 and up to four AE-50/EW-50 expansion
controllers.
・ When using the Web browser function, access each AE-50/EW-50 to perform monitoring and operation.
14