Mitsubishi Electric GB-50ADA-A Installation Instructions Manual page 11

* Main and Sub system controllers (M-NET)
GB-50ADA can be used only as the Main controller, not as a Sub controller.
Main system controller (Main SC)
Main SC refers to a controller that controls all other system controllers including the units they control. If a given system
has only one system controller, that controller becomes a Main controller. Group settings and interlock settings can be
made only from a Main controller.
Sub system controller (Sub SC)
Sub controller refers to a system controller that is controlled (including the units it controls) by a Main system controller.
GB-50ADA
Main SC's control range (M-NET)
Sub SC's control
range
Group Group
Note Groups that are not under the control of a Main controller cannot be controlled from a Sub controller.
Each group cannot be placed under the control of two or more Main controllers.
Sub controllers cannot be placed under the control of two or more Main controllers.
GB-50ADA is exclusively for use as a Main SC. It cannot be used as a Sub SC
Group
or controlled from a Main SC.
Main SC
Group Group
Main SC 1
Group Group
Main SC 1
Group Group
Sub SC
Group
Main SC 2
Group
Sub SC Main SC 2
Group
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Group