Technical Specifications Back‑plane I/O bus interface, fieldbus physical communication port. Auxiliary power 24 V DC, typical power consumption 4.1 W. Operating temperature 0 ℃ to +60 ℃, storage temperature ‑40 ℃ to +85 ℃, non‑condensing relative humidity 5%‑95%.
Functional Features Collects all I/O point data from S800 rack through back‑plane bus. Executes fieldbus protocol processing and transmits I/O data to DCS controller. Receives control output commands from controller and distributes to corresponding I/O modules. Front‑panel LED displays fieldbus link and module fault status. Built‑in hardware self‑diagnosis detects bus interruption and internal circuit faults.
Application Scenarios Fieldbus communication spare part for ABB distributed S800 I/O station. Used for process industry DCS remote I/O cabinet maintenance.
Performance Parameters Stable real‑time fieldbus data transmission performance. Reliable protocol processing capability. Fast communication fault identification.
Material Composition Flame‑retardant plastic module housing. Multilayer glass‑fiber epoxy printed circuit board. Fieldbus protocol processing chip and signal isolation assemblies. Back‑plane plug‑in connector and fieldbus port.
Structural Characteristics Standard S800 rack plug‑in module. Front side equipped with fieldbus communication port and status LED indicators. Rear side fitted with back‑plane bus connector. Weight approximately 0.39 kilogram.
Working Principle CB801 collects digital status and analog value of each I/O module from back‑plane bus. Downstream control commands are parsed and sent to target I/O modules. Diagnosis circuit continuously monitors fieldbus link and back‑plane bus operating condition.
Installation Requirements Disconnect rack auxiliary power before replacement. Insert CB801 into S800 rack designated slot and lock fixing latch. Connect fieldbus communication cable to front‑end port. Ensure back‑plane connector is fully engaged. Restore power supply, configure communication parameters and verify all I/O point data interaction.
Usage Notes Use qualified industrial fieldbus cables. Set correct station address and communication parameters. Hot‑plug operation under powered condition is prohibited. Verify full I/O data reading and writing after replacement.
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