Overview
Configured for field wiring termination and I/O signal routing in the ABB S800 I/O system, the ABB TU818 3BSE069209R1 (TU818 Compact Module Termination Unit) provides direct electrical connection between field circuits and S800 I/O modules.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | TU818 3BSE069209R1 |
| Brand | ABB |
| Product Type | Compact Module Termination Unit |
| System Compatibility | ABB S800 I/O, System 800xA, Compact Product Suite |
| Origin | Sweden |
| Configuration | Single non-redundant I/O termination |
| I/O Capacity | Up to 32 channels or 2 isolated groups of 16 channels |
| Rated Insulation Voltage | 50 V |
| Maximum Current per I/O Channel | 2.5 A |
| Maximum Process Power Current | 8 A per L1+/L2+ connection |
| Dielectric Test Voltage | 500 V AC |
| Process Wiring Terminal | 40-pole screw terminal block |
| Wire Size | Solid wire: 0.5 – 2.5 mm2; Stranded wire: 0.5 – 1.5 mm2 |
| Mounting Type | DIN Rail mounting, horizontal or vertical |
| Dimensions | 58.5 mm x 64 mm x 170 mm |
| Weight | 0.17 kg |
| Operating Temp | Horizontal mounting: 0 deg C to +55 deg C; Vertical mounting: 0 deg C to +40 deg C |
| Storage Temp | -40 deg C to +70 deg C |
| Relative Humidity | 5% to 95%, non-condensing |
| Protection Rating | IP20 |
ABB S800 I/O Backplane Bus and I/O Density Scaling
The TU818 connects field wiring to ABB S800 I/O modules and transfers ModuleBus communication and power connections through the termination assembly. In addition, the unit supports I/O density scaling by providing a compact interface for single I/O module configurations.
The termination unit uses mechanical keying features with 36 possible settings to prevent incorrect module installation. Therefore, maintenance personnel can verify module compatibility before replacement or service operations.
The TU818 supports direct connection with S800 I/O modules, including DI, DO, AI, and pulse input module families. The passive design provides terminal access without additional signal processing electronics.
Frequently Asked Questions
Q: Does the TU818 provide signal conversion or signal isolation functions?
A: No. The TU818 is a passive Module Termination Unit that provides field wiring termination and electrical routing between field circuits and compatible S800 I/O modules.
Q: Which ABB I/O modules can connect to the TU818?
A: The TU818 supports selected ABB S800 I/O modules, including DI810, DI811, DI818, DI830, DI831, DI840, DI880, DI885, DO818, AI810, AI815, AI835A, AI843, AI845, AI880A, and DP840.
Q: Can the TU818 operate as a redundant termination unit?
A: No. The TU818 supports single non-redundant I/O configurations. Redundant system designs require compatible redundant termination solutions.
Field Installation Guidelines
Install the TU818 on a standard DIN rail and maintain correct mechanical alignment with the connected S800 I/O module.
Connect field wiring according to the terminal assignment documentation and verify conductor size compatibility before energizing the system. Separate signal wiring from high-current power cables to reduce electrical interference.
Use proper grounding practices for the control cabinet and maintain cable shielding methods according to the installation requirements of the connected I/O system. Before module insertion, confirm that the mechanical keying position matches the configured module type.
Verify terminal tightness, wiring identification, and ModuleBus connection conditions during commissioning and maintenance procedures.
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