Dependent on module's mode, the maximum number of IEDs differs :
As Client > max. number of supported IEDs is 32
As Server > max. number of simultaneous client connections is 16 (connection numbers is independent on the number of existing clients. One client could establish more than one connection with the module. Thus, 16 connections do not imply the existence of 16 clients)
For more info, please refer to the attachment