Overview
Manuals
Dual ModuleBus Architecture
TB840A Pairing
Cluster Address Recovery
Features:
- dual electrical ModuleBus for two TB840/TB840A modems for the documented signal arrangement
- S800 I/O station mounting with module-key and wiring verification
- redundant optical ModuleBus termination unit for the confirmed installation
ABB identifies TU840 3BSE020846R1 as redundant optical modulebus termination unit for ABB S800 I/O. TU840 supports redundant optical ModuleBus connection for an S800 I/O cluster using two TB840 or TB840A modems. The unit forms the mechanical and electrical base between the selected I/O module and the field wiring, so channel mapping, voltage class and terminal configuration must be preserved during service. The complete ordering identity is important because related units can differ in channel arrangement, termination design, interface function or supported system generation. Selection should therefore be based on the article number, nameplate and installed configuration rather than appearance alone.
Technical content is limited to ABB S800 I/O System for Compact Product Suite data sheet. Final suitability is confirmed against the installed unit, nameplate and system records.
The ABB TU840 3BSE020846R1 redundant optical ModuleBus termination unit is supported by Moore Automated for verified industrial replacement and spare-part requirements.
ABB TU840 3BSE020846R1 redundant optical ModuleBus termination unit manual(Datasheets), Link
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
Dual ModuleBus Architecture
TU840 uses dual electrical ModuleBus for two TB840/TB840A modems; preserve the documented terminal-bank organization and field-wire identification.
TB840A Pairing
Confirm the selected S800 I/O module, redundant cluster arrangement, voltage class and any power, fuse or modem dependency before replacement.
Cluster Address Recovery
Isolate the station, photograph and label every conductor, compare the module key and terminal numbers, and follow ABB recommissioning checks.
