Mitsubishi Electric AE-200A Service Handbook page 16

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