ABB TB810 S800 I/O / AC 800M ModuleBus Port

The ABB TB810 3BSE008560R1, also cataloged as the ABB TB810 Optical ModuleBus Port Cluster Modem, operates as a dedicated hardware component for optical-to-electrical interface media conversion within S800 I/O / AC 800M Controller Platforms. The unit converts standard backplane electrical signaling into optical pulses, enabling the extension of the local ModuleBus backbone network via fiber optic links to remote I/O clusters. It supports up to 7 clusters per optical ring topology to transmit data directly between distributed field sub-nodes and the central processing unit.

Hardware Specifications

Profinet / EtherNet/IP Deterministic Networks and ModuleBus Expansion

The TB810 functions at the physical hardware layer to expand deterministic networks, matching data throughput rates required by upstream master controllers running industrial protocols. By establishing synchronized, low-latency transmission over fiber optic media, the module ensures proper I/O density scaling across multi-cluster architectures without degrading communication velocity. The optical conversion circuit maintains strict real-time bus cycle consistency, providing high noise immunity against electromagnetic fields. It operates independently of the controller firmware flash compatibility layer, executing direct bit-stream mapping to guarantee deterministic link performance across the optical loop.

Frequently Asked Questions

Q: Can the TB810 modem be hot-swapped while the ModuleBus network is actively communicating? A: No. Removing or inserting the TB810 during active operation will break the continuity of the electrical and optical ModuleBus ring, causing immediate loss of communication to all downstream I/O clusters on that segment. Power down the local I/O cluster before performing any hardware changes.

Q: What are the specific length limitations when using different fiber optic cable types with the TB810? A: The TB810 supports a maximum link distance of 15 m when using Plastic Optical Fiber (POF). When utilizing Hard Clad Silica (HCS) fiber, the maximum transmission distance increases to 200 m between nodes. Exceeding these limits will cause signal attenuation and packet drops.

Q: How many remote I/O clusters can a single optical ring accommodate using TB810 modules? A: A single optical ModuleBus ring configuration can accommodate a maximum of 7 remote I/O clusters connected to the central controller.

Field Installation Guidelines

• Isolate or switch off all power lines to the local I/O cluster before snapping the TB810 onto the 35 mm DIN rail to avoid communication initialization glitches and electrical transients.
• Handle all optical fiber cables with care, ensuring that the minimum bend radius of 30 to 50 mm is strictly maintained to prevent physical damage to the core and signal attenuation issues.
• Clean the optical fiber connector tips thoroughly with lint-free wipes and specialized optical cleaning fluid before inserting them into the Rx (Receiver) and Tx (Transmitter) ports.
• Verify that the 24 VDC power supply lines are correctly fused and that the modem's grounding tab establishes solid, paint-free, metal-to-metal contact with the metallic DIN rail.
• Ensure proper alignment of the optical connectors during insertion until the locking tabs fully engage to prevent dust ingress and optical misalignment.