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The documented chain pairs the IM300-3 in the central controller with an IM312-3 in the expansion unit. Up to four IM300 modules can be used in one central controller, and the centralized path to the last expansion-unit interface must remain within 2 m.
Important Notice: preserve the complete 6ES5300-3AB11 identity, central-controller slot, IM312-3 pairing, cable route and final termination before replacement.
The documents separate exact product evidence from the field sequence for identity, isolation, installation, verification and controlled handover.