Features:
- Optical-to-electrical ModuleBus conversion for one S800 I/O cluster.
- Dual optical ports supporting a line-redundant communication path.
- Integrated cluster and ModuleBus power supervision.
TB840A 3BSE037760R1 occupies the communication boundary between the fiber ModuleBus and the local electrical I/O segment.
Its slave role keeps I/O traffic under controller direction while extending the bus through multiple optical clusters.
Isolation and input fusing are built into the modem supply path, separating communication conversion from external cabinet protection.
The ABB TB840A 3BSE037760R1 ModuleBus Modem is listed as Active / Available from OEM. Apter Power supports technical-document and configuration review.
ABB TB840A 3BSE037760R1 S800 I/O ModuleBus Modem Manuals,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.
Where optical and electrical ModuleBus meet
- Optical Side: Two fiber ports carry the ModuleBus between I/O clusters.
- Electrical Side: The same logical bus continues from the modem to the local I/O modules.
- Local Capacity: One electrical segment supports as many as twelve modules.
- Distributed Capacity: The fiber path can extend across as many as seven clusters.
Two independent redundancy layers
- Line Level: Separate optical paths support ModuleBus line redundancy.
- Modem Level: TB840A supports redundant module operation.
- Termination Choice: TU840 provides dual ModuleBus connections, while TU841 provides a single ModuleBus arrangement.
- Service Mode: Hot swap is supported within the documented redundant architecture.
Status and power functions at the modem boundary
- Cluster Watch: The modem supervises the connected I/O group.
- Supply Watch: ModuleBus power conditions are included in the supervision path.
- Isolation: An isolated supply feeds the I/O modules through the modem arrangement.
- Input Protection: The incoming power path includes a fuse.
Cabinet conditions that preserve the ratings
- Operating Range: The documented ambient range is 0 to 55 °C.
- Vertical Limit: Maximum ambient temperature is 40 °C for vertical mounting.
- Moisture: Relative humidity is limited to 5 to 95 percent without condensation.
- Protection Boundary: The installation must maintain the IP20 and Pollution Degree 2 conditions.