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ABB TU836V1 – Extended Module Termination Unit for S800 I/O Systems
Product Overview
The ABB TU836V1 (Article No. 3BSE013237R1) is an extended Module Termination Unit (MTU) designed for the S800 I/O system, widely deployed within ABB’s 800xA distributed control systems and AC 800M controllers-8-. As a passive termination unit, the TU836V1 provides the physical and electrical interface between field devices and S800 I/O modules, converting module pin signals into accessible screw terminals for straightforward field wiring-11-17.
The core challenge this MTU addresses is the complexity and risk associated with direct wiring to high-density I/O modules. In large-scale industrial installations, terminating field signals—from switches, relays, actuators, and sensors—directly onto module pins is impractical, error-prone, and difficult to maintain. The TU836V1 solves this by offering a structured, fuse-protected termination point that simplifies installation, reduces wiring errors, and enables module replacement without disturbing field cables-8. It also distributes the ModuleBus to connected I/O modules and generates correct address signals through position shifting, ensuring seamless communication within the I/O station-10.
Technical Specifications — TU836V1
| Parameter | Value |
|---|---|
| Product Model | TU836V1 |
| Article Number | 3BSE013237R1 |
| Manufacturer | ABB |
| Product Type | Extended Module Termination Unit (MTU) |
| Series | S800 I/O |
| I/O Channels | Up to 8-1 |
| Maximum Rated Voltage | 250 V-1 |
| Maximum Current per Channel | 3 A-10 |
| Maximum Current (Process Connection) | 10 A-10 |
| Connection Type | Screw terminal block-1 |
| Terminals | 24 individual screw terminals-25 |
| Acceptable Wire Sizes (Solid) | 0.2 – 4 mm²-10 |
| Acceptable Wire Sizes (Stranded) | 0.2 – 2.5 mm² (24 – 12 AWG)-10 |
| Recommended Torque | 0.5 – 0.6 Nm-10 |
| Stripping Length | 7 mm-10 |
| Dielectric Test Voltage | 2000 V AC-10 |
| Mounting | 35 mm DIN rail (both directions)-1 |
| Dimensions (W x H x D) | 126 x 110 x 64 mm-1 |
| Weight | 0.26 kg (0.57 lbs)-1 |
| Operating Temperature | 0 to +55°C (+32 to +131°F)-10 |
| Protection Rating | IP20-8 |
| Fuse Type | 3.15 A (fast glass tube, 5×20 mm)-11 |
| RoHS Compliance | EN 50581:2012-1 |
| WEEE Compliance | DIRECTIVE 2012/19/EU-1 |
| Marine Certifications | ABS, BV, DNV-GL, LR-10 |
ABB TU836V1
Key Features and Benefits — TU836V1
- Two Isolated Groups with Fused Channels – The TU836V1 provides two groups with four channels each, featuring fused load power terminals and signal return connections for every channel-11. Process voltage can be connected to each group independently, offering flexibility for applications requiring separate power domains-10.
- Mechanical Keying for Error Prevention – Two mechanical keys with six positions each provide 36 possible configurations, ensuring that only compatible I/O modules—such as DO820 and DO821—can be inserted-10-11. This purely mechanical safeguard prevents mismatched module installation and protects against voltage-related damage.
- ModuleBus Distribution & Address Generation – The MTU distributes the ModuleBus to the I/O module and to the next MTU in the chain. It generates the correct address for each I/O module by shifting outgoing position signals, enabling proper system identification and communication-10-11.
- Hot-Swap Capability – The mechanical locking mechanism not only secures the I/O module in position but also provides a BLOCK signal that keeps the module in its initial state until fully locked-11. This supports safe module replacement during system operation without powering down the entire station-25.
- DIN Rail Mounting with Grounding Latch – Designed for standard 35 mm DIN rail installation, the TU836V1 features a mechanical latch that locks the MTU securely to the rail while providing a grounding path-10. The latch can be released with a screwdriver for easy removal-11.
Related Models
TU835V1 – Standard MTU for S800 I/O systems, offering similar termination functionality with different channel and fuse configurations-.
TU837V1 – Extended MTU with 16 I/O channels and 28 terminals, designed for higher-density digital I/O applications-1.
TU838 – Compact MTU supporting up to 16 I/O channels with 8 fused sensor power outlets, suitable for 50 V applications-1.
TU839 – Extended MTU with 8 channels and 28 terminals, featuring 0.2 A process power terminals-1.
Installation and Maintenance — TU836V1
Installation of the TU836V1 follows a straightforward process. The MTU snaps onto a standard 35 mm DIN rail in either horizontal or vertical orientation-10-25. The mechanical latch secures the unit and establishes the grounding connection-10. Field wiring connects to the 24 screw terminals: two groups of four channels each, with fused load outlets and signal return connections per channel-11.
Before inserting the I/O module—typically a DO820 or DO821 digital output module-10—configure the two mechanical keys to match the specific module type-10. Once configured, slide the I/O module into the MTU until the locking mechanism engages-11. This action simultaneously connects the ModuleBus and activates the I/O module.
Maintenance is minimal. The TU836V1 is a passive unit with no active components, offering high reliability. When fuse replacement is required, each channel uses a standard 3.15 A fast-acting glass tube fuse (5×20 mm)-11. The hot-swap design allows I/O module replacement without powering down the station, and the separate termination means field wiring remains undisturbed during module swaps-17. Routine inspection of terminal torque and fuse condition is recommended to ensure long-term reliability.
