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For distributed operation, the IM301-3 pairs with IM310 modules through 6ES5721-series connecting cable over 1 m to 200 m. The manual excludes this IM301-3 arrangement from S5-155H service and limits the remote expansion units to compatible I/O modules and IPs without page addressing.
Important Notice: preserve the complete 6ES5301-3AB13 identity, central-controller slot, IM310 pairing, cable type, route length and termination before replacement.
The documents separate exact product evidence from the field sequence for identity, isolation, installation, verification and controlled handover.