B&R 7TB718.91 Spring Terminal

B&R 7TB718.91 Spring TerminalModel: 7TB718.91

Marca: B&R

Categoria: 18-pin Push-in Cage Clamp Front Connector for System 2003 / Sistema 2005 Módulos de E/S

Comparison within the series:

7TB718.9: 18-pin Screw Clamp Terminal

7TB718.91: 18-pin Push-in Cage Clamp Terminal (Model inquired)

Função: Front connector for I/O modules, equipped with dual-side release levers for easy plugging and removal.

1. Explicação do código do modelo

III. Elétrica & Especificações Mecânicas

Number of pins: 18 alfinetes, single row

Connection method: Push-in cage clamp

Seção transversal do fio: 0.2 ~ 1.5 mm² (28～14 AWG), copper conductors only

Tensão nominal: 300 V

Rated current per contact: 10 UM

Contact resistance: ≤4.2 mΩ

Pin pitch: 3.5 milímetros

Certificações: cULus, CE

Housing color: Vermelho

1. Compatible I/O Modules (Correspondência obrigatória)

Primarily used for mixed-signal modules under System 2003 / Sistema 2005:

✅ 7CM211.7 (Classic mixed AI/AO/DI/DO module, requires 2 pcs of 7TB718.91)

Observação: Not compatible with X20 series terminals; interchange is not allowed!

1. Notas importantes
2. Ciclo de vida do produto: Sistema 2003 platform belongs to legacy equipment and is gradually phased out by the manufacturer; spare parts supply is tight on the market.
3. Intercambialidade

7TB718.91 (Empurrar) ≠ 7TB718.9 (screw type). Though the outer dimensions are identical, internal clamping structures differ and cannot be directly swapped.

3. Procurement Reminder

One 7CM211.7 module requires 2 pieces of 7TB718.91. Avoid ordering only one piece.

4. Proibições: Aluminum conductors are not permitted; wire cross-section cannot exceed 1.5 mm².
5. Solução de problemas comuns

Terminal fails to lock: Check wire stripping length and loose copper strands. Replace the terminal directly if the push-in spring suffers fatigue.

Mau contato: Verify whether the release lever is fully engaged.

If required, I can provide:

1) Pin assignment table for 7CM211.7;

2) Excerpts from official datasheet of 7TB718.91;

3) Identification guidelines for new & second-hand spare parts.

Application Scenarios of B&R 7TB718.91

Basic Premise

7TB718.91 = 18-pin Push-in Cage Clamp Front Connector, Primary matching module: 7CM211.7 (System2003/System2005 Mixed I/O Module)

One 7CM211.7 requires 2 pcs of 7TB718.91. The module integrates DI/DO, analog AI/AO and encoder high-speed counter channels, serving as an all-in-one signal acquisition module for legacy equipment.

Peer screw terminal model: 7TB718.9. 7TB718.91 is preferred for projects demanding fast wiring, vibration resistance and maintenance-free cabinets.

1. Typical Industrial Application Scenarios (Mainly for Existing Installations)
2. Máquinas para Plásticos (Largest Consumption)

Máquinas de moldagem por injeção, extrusoras, máquinas de moldagem por sopro, bag-making machines, pelletizing lines

Signal Applications

Termopar & pressure transducer analog acquisition (barrel temperature, melt pressure), limit switch DI, solenoid valve DO, encoder speed/position acquisition, proportional valve analog output.

Why choose 7TB718.91

Continuous machine vibration; spring terminals avoid loosening over time compared with screw terminals. High wiring efficiency for cabinet mass assembly.

2. Máquinas de embalagem

Vertical form-fill-seal machines, heavy-duty FFS packaging machines, heat-sealing cutting equipment, carton processing machines

Signal Applications

Photoelectric sensors, level detection, servo encoder signals, tension analog signals, cylinder solenoid valve outputs.

3. Impressão & Paper Machinery

Gravure printers, máquinas de corte, rewinders, paper coating equipment

Signal Applications

Tension sensors, web guiding encoders, oven temperature acquisition, logic I/O for conveying mechanisms.

4. Máquinas Têxteis

Warp knitting machines, circular looms, spinning equipment, nonwoven production lines

Características: 24/7 continuous operation with persistent vibration, ideal for maintenance-free push-in connection.

5. Comida & Pharmaceutical Equipment

Máquinas de enchimento, tablet presses, transmitir & sorting lines, washing equipment

Observação: Use properly terminated cables to prevent oxidation in humid environments; wire ferrules are recommended.

6. Special Machine Tools, Rubber Vulcanizing Equipment, Lithium Battery Coating Front-end Equipment

Widely adopted in retrofitting projects of legacy B&R System2005 control systems.

1. Application Scenarios Classified by Operating Conditions

✅ Preferred Scenarios for 7TB718.91 (Push-in Type)

1. Equipment with continuous vibration (plastics machinery, máquinas têxteis, high-speed packaging equipment)

Constant clamping force from springs eliminates signal drift and downtime caused by loose screws; 7TB718.9 screw terminals tend to loosen under long-term vibration.

2. Mass equipment production & large-scale cabinet wiring

Solid wires or stranded wires fitted with wire ferrules support tool-free direct insertion, drastically cutting assembly time.

3. Frequent on-site maintenance & cable replacement

Built-in side release levers enable convenient wire disconnection, improving maintenance efficiency.

4. Compact control cabinets with limited operating space

No screwdriver rotation required for wiring.

⚠️ More Suitable Scenarios for 7TB718.9 (Terminal de parafuso)

1. Large amount of bare stranded wires without wire ferrules on site;
2. Outdoor locations with heavy dust, extreme temperature fluctuation and poor maintenance conditions;
3. Projects with strict budget constraints.

III. Signal Application Scenarios (Supported by 7CM211.7)

7TB718.91 carries all channel signals:

1. Digital Input DI (24CCV): Proximity switches, sensores fotoelétricos, safety limit switches, start/stop pushbuttons
2. Transistor Digital Output DO: Small solenoid valves, indicator lamps
3. Analog Input AI ±10V / 0~20mA: Pressão, temperatura, tension transmitters
4. Analog Output AO ±10V: Válvulas proporcionais, frequency converter setpoints, servo external commands
5. Incremental Encoder / High-speed Counter Channels: Spindle speed measurement, traction length detection
6. Special Market Scenario: Equipment Retrofit & Spare Part Replacement

The System2005 platform has entered the end of its lifecycle and is no longer specified for new projects.

Current biggest application of 7TB718.91: Spare parts for legacy equipment maintenance

Overhaul of imported second-hand injection molding machines and packaging production lines;

Upgrade from aged 7TB718.9 screw terminals prone to poor contact to 7TB718.91;

Localized maintenance for overseas equipment and spare part stocking for exported legacy machines.

1. Application Limitations (Cenários inadequados)
2. Incompatible with X20 series I/O modules due to mechanical mismatch;
3. Not applicable for wires larger than 1.5 mm²; copper conductors only, aluminum wires forbidden;
4. Not designed for high-power circuits (10 A maximum per contact, for control signal circuits only);
5. Shielded analog cables are recommended for environments with heavy electromagnetic interference.

Advantages of B&R 7TB718.91

Compared with the equivalent screw terminal 7TB718.9, combined with industrial field conditions, advantages are sorted into four dimensions: hardware, conjunto, maintenance and reliability.

Basic Premise: 7TB718.91 is an 18-pin Push-in Cage Clamp Front Connector, matched with 7CM211.7 (System2005 mixed I/O module).

1. Wiring Advantages (Core Value for Equipment Manufacturers)
2. Tool-free fast wiring

Solid conductors and stranded wires crimped with wire ferrules can be inserted directly without screwdriver tightening, greatly reducing wiring workload for cabinet mass production.

2. Independent dual-side release levers

Each terminal channel is equipped with an operating lever. Press the lever to release wires, facilitating operation inside compact control cabinets and delivering higher disassembly efficiency than screw terminals.

3. Wide compatible wire range

Supports conductors from 0.2～1.5 mm². Digital I/O cables, 4~20mA analog cables and encoder cables can adopt the same terminal model, reducing terminal part numbers inside cabinets.

1. Long-term Operational Reliability (Key Concern for OEMs & End Users)
2. Vibration resistance & anti-loosening performance

The cage clamp spring mechanism delivers constant clamping force, unaffected by thermal cycling and continuous equipment vibration. Screw terminals may loosen after long-term vibration, triggering signal drift, intermittent disconnection and unexpected machine alarms.

Perfect for continuously vibrating equipment such as injection molding machines, packaging machines and textile machinery.

2. Stable contact resistance

Persistent spring compression maintains low contact resistance over service life, minimizing zero drift during analog signal acquisition (temperatura, pressão, tensão).

3. Reduced human assembly errors

Screw terminals face two common risks: over-torque cutting conductors or under-torque leading to loose connections. Push-in design eliminates torque control requirements and lowers assembly failure rates.

III. Comissionamento & Maintenance Advantages

1. Convenient inspection with less risk of wire damage

Durante o comissionamento, modification and cable replacement, wires are released by pressing levers; fine stranded wires are less likely to be twisted and broken compared with screw terminals.

2. Excellent reusability after repeated disassembly

Under proper operation, terminals support multiple wiring cycles with slow spring fatigue, suitable for production lines requiring frequent commissioning and process modification.

1. Mecânico & Platform Compatibility Advantages
2. Identical mechanical outline to 7TB718.9

Base dimensions, latches and positioning structures are fully consistent, enabling direct hardware swap for retrofit. Existing installations using screw terminals can upgrade to anti-vibration 7TB718.91 without modifying cabinet cutouts or wiring drawings.

2. Original manufacturer matching ensures signal integrity

Genuine B&R front connectors are impedance-matched to the 7CM211.7 module, ensuring stable transmission of DI, AI/AO and high-speed encoder signals. Third-party compatible terminals tend to suffer interference and abnormal counting.

3. Standard red housing for circuit identification

Red casing helps electricians quickly recognize terminals for mixed-signal I/O modules, facilitating drawing marking and on-site inspection.

1. Disadvantages for Reference during Selection
2. Bare stranded wires (without wire ferrules) tend to fray, leading to inferior connection quality vs screw terminals;
3. Purchase unit price is slightly higher than screw version 7TB718.9.

Choose 7TB718.91 for new machines with continuous vibration, mass wiring and long-term maintenance-free requirements; select 7TB718.9 screw terminals if bare stranded wires are widely used on site and budget is tight.