ABB CI856K01 S100 I/O Interface

The ABB CI856K01 3BSE026055R1, also cataloged as the CI856K01 Communication Module, operates as a dedicated hardware component for interfacing legacy S100 I/O racks with AC 800M controller platforms within System 800xA architecture.

Hardware Specifications

Backplane Bus Communication & I/O Density Scaling

The ABB CI856K01 communicates directly with the central processing unit over the CEX-Bus backplane, deriving operational power directly from the processor without requiring external auxiliary power connections. The module coordinates cyclic data transfer and I/O density scaling across up to 5 S100 I/O racks, managing deterministic signal polling for as many as 100 individual I/O boards per interface channel. Integrated firmware flash compatibility preserves communication synchronization and diagnostic mapping across the bus, allowing legacy field wiring termination assemblies to integrate directly into modern AC 800M control topologies.

Frequently Asked Questions

Q: How does the CI856 module draw power within the AC 800M system rack assembly?

A: The CI856 draws its 120 mA typical 24 VDC operational power directly from the AC 800M processor unit across the internal CEX-Bus backplane connection, eliminating the need for external power wiring to the module.

Q: What physical cabling is used to connect the CI856 module to legacy S100 I/O racks?

A: The module routes communication signals through a dedicated 36-pin Mini-ribbon connector on the TP856 baseplate, connecting directly to the ribbon cabling of the S100 I/O rack structure.

Q: Does servicing or replacing the CI856 module require shutting down the AC 800M processor?

A: No. The CI856 supports hot-swapping, allowing removal and replacement of the active communication module on the TP856 baseplate without interrupting power or backplane signals on the remaining CEX-Bus rack assembly.

Field Installation Guidelines

Mount the TP856 baseplate onto a standard DIN rail within an enclosure providing an IP20 protection level or higher. Route the 36-pin Mini-ribbon cable from the S100 I/O rack directly to the connector interface on the baseplate assembly, ensuring the locking latches engage securely to prevent pin misalignments or intermittent signal loss. Maintain adequate separation between ribbon signal cables and high-voltage AC conductors within the cabinet to prevent capacitive noise coupling. Ensure cabinet ambient temperatures remain within 0 to +55 deg C and confirm that all S100 rack grounding straps connect back to a central low-impedance ground bar before system commissioning.