Cpu222cn can be followed by two analog modules EM231cn?

Cpu222cn can be followed by two analog module EM231cn? The CPU connection is connected to EM231, then EM231 is connected with a EM231, then EM231 CP receiving module, which can meet, know to say ah, recently has been working on this problem, the programming software can only detect two analog modules, while CP can not be detected, if removed a simulation module, CP can be detected, this is why?

Best answer
Cpu222cn can only bring up to two modules (including the CP module), for 224 of the bar

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