What Is the ABB TU835V1 Extended?
When your industrial automation system demands reliable signal distribution and fault prevention, the ABB TU835V1 Extended Module Termination Unit (MTU) delivers. This unit supports up to 8 I/O channels, each rated for a maximum voltage of 50V and a maximum current of 2 A. It distributes the ModuleBus to the connected I/O module and to the next MTU in the chain, while generating the correct address by shifting outgoing position signals. The TU835V1 mounts on a standard DIN rail with a mechanical latch that locks securely and releases easily with a screwdriver. Two mechanical keys, each with six positions, provide 36 possible configurations to prevent insertion of the wrong I/O module—this is a purely mechanical safeguard that does not affect electrical functionality.
Technical Specifications Breakdown
- Channels and Ratings: The TU835V1 provides up to 8 I/O channels. The maximum rated voltage is 50 V, and the maximum current per I/O channel is 2 A. Each channel includes one fused transducer power terminal and one signal connection, ensuring clean power distribution.
- Process Power and Connections: Process voltage connects to 2 individually isolated groups. The maximum current per process connection is 8 A. The unit accepts solid wires from 0.2 to 4 mm² and stranded wires from 0.2 to 2.5 mm² (24–12 AWG). Recommended torque is 0.5–0.6 Nm with a stripping length of 7 mm.
- Environmental Durability: Operating temperature ranges from 0 to +55 °C (+32 to +131 °F), with storage from -40 to +70 °C. The protection class is IP20 per IEC 60529. It carries CE, hazardous location (C1 Div 2 cULus, C1 Zone 2 cULus, ATEX Zone 2), marine (ABS, BV, DNV-GL, LR), and electrical safety (EN 61010-1, UL 61010-1) certifications.
- Dimensions and Weight: Width 126 mm (5 in.) including connector, depth 64 mm (2.52 in.) including terminals, height 110 mm (4.3 in.), and weight 0.26 kg (0.57 lbs).
Industry Applications
In process control environments, the TU835V1 excels at managing field signals for analog input modules like AI810, AI815, and AI845. For example, in a chemical plant, it distributes ModuleBus and process power to multiple I/O modules while maintaining galvanic isolation between two groups. This reduces wiring errors and simplifies troubleshooting. In oil and gas facilities, the mechanical keying prevents costly downtime caused by inserting incompatible modules. The unit's 55 °C maximum ambient temperature suits harsh industrial settings without active cooling.
Installation and Setup Guidance
Mount the TU835V1 on a standard DIN rail. Push the unit onto the rail until the mechanical latch clicks into place. To remove, insert a screwdriver into the latch release and lift the unit off. Connect field wiring using solid or stranded wires within the specified sizes. Tighten terminals to 0.5–0.6 Nm and strip wires to 7 mm. Configure the two mechanical keys according to your I/O module type—this ensures only the correct module can be inserted. Always verify that the process power connections are made to the correct isolated groups (up to 8 A per connection).
Maintenance and Reliability
Periodically inspect the TU835V1 for signs of corrosion or loose connections, especially in environments classified as ISA-S71.04 G3. The unit's IP20 protection requires installation inside a clean, dry enclosure. Ensure the DIN rail latch remains free of debris. Because the MTU has no moving parts, its primary wear points are the terminal connections—re-torque them during scheduled maintenance. The operating temperature range of 0 to +55 °C allows reliable performance in most industrial settings without forced cooling.
Compatibility and Integration
The TU835V1 works with ABB I/O modules AI810, AI815, and AI845. It connects to the ModuleBus and distributes signals to the I/O module and downstream MTUs. The unit supports single I/O configurations. Its mechanical keying ensures physical compatibility with the intended module type. For integration, verify that the ModuleBus address shifting aligns with your system's addressing scheme.
Selection Guide and Purchasing Advice
Before ordering the ABB TU835V1 (article number 3BSE013236R1), confirm that your system requires an Extended MTU with up to 8 channels and 50V/2A per channel. Check that your I/O modules are among the supported types (AI810, AI815, AI845). Ensure your DIN rail is standard profile and your enclosure meets IP20 requirements. SpareTechPLC offers this unit with full traceability and fast shipping. Contact our team to verify current lifecycle status and availability before placing your order.
Frequently Asked Questions
What is the maximum current per I/O channel on the TU835V1?
The maximum current per I/O channel is 2 A, with a maximum rated voltage of 50 V.
Can the TU835V1 be used with redundant I/O configurations?
No, the data specifies single I/O only. The TU835V1 supports single I/O configurations.
What wire sizes are acceptable for the TU835V1 terminals?
Solid wires from 0.2 to 4 mm² and stranded wires from 0.2 to 2.5 mm² (24–12 AWG) are acceptable. Recommended torque is 0.5–0.6 Nm with a stripping length of 7 mm.
Does the TU835V1 require any special tools for installation?
No special tools are needed beyond a standard screwdriver for the DIN rail latch release and a torque screwdriver for terminal connections.
What certifications does the TU835V1 hold for hazardous locations?
It holds C1 Div 2 cULus, C1 Zone 2 cULus, and ATEX Zone 2 certifications for hazardous locations.
