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ABB TU891 Compact Terminal Unit
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- Part Number: TU891
- Brand: ABB
- Type: Compact Terminal Unit
- Dimensions: 116x2.5x2cm
- Country of Origin: USA
- Barcode: 8537101190
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Additional Specifications
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Product Description
The ABB TU891, also cataloged as the TU891 Compact Terminal Unit, operates as a dedicated hardware component for localized process wiring termination within S800 I/O network platforms.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | TU891 |
| Brand | ABB |
| Article Number | 3BSC840157R1 |
| Origin | Sweden |
| Product Type | Terminal Blocks |
| Channel Capacity | 8 independent processing channels |
| Nominal Voltage | 24 V |
| System Loop Redundancy | Single I/O configuration |
| Compatible I/O Modules | AI890, AI893, AI895, AO890, AO895, DI890, DO890 |
| Physical Process Terminals | 27 gray terminals |
| Maximum Current per I/O Channel | 2 A |
| Solid Wire Size Range (Process) | 0.2 to 4 mm2 |
| Stranded Wire Size Range (Process) | 0.2 to 2.5 mm2 (24 to 12 AWG) |
| Power Supply Wire Size Range | 0.25 to 2.5 mm2 (24 to 14 AWG) |
| Recommended Terminal Screw Torque | 0.5 to 0.6 Nm |
| Dielectric Test Voltage | 500 V AC |
| Mechanical Mounting Format | Horizontal DIN-rail installation |
| Width Dimension | 64 mm (including connector), 58.5 mm (installed edge-to-edge) |
| Depth Dimension | 58 mm (chassis base), 106 mm (including terminals) |
| Height Dimension | 194 mm (including retention latch) |
| Weight | 0.17 kg (0.37 lbs) |
| Maximum Operational Temperature | 55 deg C under full electrical load |
Profinet / EtherNet/IP Deterministic Networks and Driver Integration
The compact terminal unit mounts directly onto standard DIN rails to establish electrical pass-through continuity between field instrumentation and matching S800 intrinsically safe I/O modules. It bridges raw analog or discrete loop signals directly to the internal processing layer, matching backplane bus communication velocity baselines through physical pin engagement. Channel parameters route seamlessly through host communication heads over Profinet or EtherNet/IP deterministic networks, enabling independent node diagnostics without introducing localized processing latency. This dense mechanical packaging supports flexible I/O density scaling routines, while full firmware flash compatibility at the parent I/O module tier ensures seamless channel configuration updates across modular process nodes.
Frequently Asked Questions
Q: Which specific intrinsic safety or standard S800 I/O cards mate with this terminal unit?
A: The hardware is engineered explicitly to interface with ABB 800xA series extended automation I/O cards, including the AI890, AI893, and AI895 analog input modules, the AO890 and AO895 analog output units, and the DI890 or DO890 discrete digital cards.
Q: What are the engineering consequences of exceeding the 0.6 Nm terminal torque specification?
A: Over-torquing the terminal clamping screws beyond 0.6 Nm can strip the internal threads or fracture the SMT solder joints connecting the terminal cage to the internal trace distribution plane, introducing intermittent open-circuit faults into the processing loop.
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