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IOCN card
The IOCN card acts as a signal and communications interface for the CPUM card. It  also protects all inputs against electromagnetic interference (EMI) and signal surges to meet electromagnetic compatibility (EMC) standards.

The IOCN card’s Ethernet connectors (1 and 2) provide access to the primary and secondary Ethernet connections, and the serial connector (RS) provides access to the secondary serial connection. In addition, the IOCN card includes two pairs of serial connectors (A and B) that provide access to the additional serial connections (from the optional serial communications module) that can be used to configure multi-drop RS-485 networks of VM600 racks.

CPUM/IOCN card pair and VM600 racks The CPUM/IOCN card pair is used with a VM600 ABE04x system rack and a CPUM card can be used either alone or with an associated IOCN card as a card pair, depending on the application/system requirements.
The CPUM is a double-width card that occupies two VM600 rack slots (card positions) and the IOCN is a single-width card that occupies a single VM600 slot. The CPUM is installed in the front of the rack (slots 0 and 1) and an associated IOCN is installed in the rear of the rack in the slot directly behind the CPUM (slot 0). Each card connects directly to the rack’s backplane using two connectors.
Note: The CPUM/IOCN card pair is compatible with all VM600 ABE04x system racks.

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