Description

Designed for decentralised and multi-node machine safety installations, the ABB 2TLA020070R1700 (Pluto B46 v2) provides robust, programmable control across a versatile array of 46 integrated input and output channels. This compact safety controller eliminates the need for numerous single-function safety relays by integrating various safety devices—including emergency stops, light curtains, and safety locks—into a single safety-bus network. Running on a 24 VDC nominal supply, the Pluto B46 v2 utilises the proprietary Pluto Safety Bus for reliable inter-module communication, enabling safe distributed intelligence up to the highest regulatory levels.

Key Features

• High-Density I/O Array: Equipped with 46 functional points, featuring 24 dedicated failsafe inputs, 16 dual-purpose non-failsafe outputs/failsafe inputs, 4 isolated failsafe relay outputs, and 2 failsafe high-side transistor outputs.
• Multi-Protocol Diagnostics: Supports seamless status monitoring and standard communications over MODBUS ASCII, Pluto Safety Bus (CAN-based), and StatusBus protocols.
• Certified Safety Performance: Engineered to meet rigorous safety classifications, achieving up to Performance Level e (PL e) according to EN ISO 13849-1 and Safety Integrity Level 3 (SIL 3) per EN 62061.
• Simplified System Expansion: Multiple Pluto controllers can be networked via the safety bus, allowing simplified data exchange and cross-cabinet safety zoning without additional hardware.

Applications

• Complex Machine Guarding: Monitoring of multiple safety light curtains, laser scanners, and interlocking gate switches.
• Distributed Safety Systems: Synchronised safety zones across long conveyors, packaging lines, and assembly cells.
• Heavy Industrial Machinery: Failsafe control of presses, robotic cells, and material handling systems requiring high-reliability relay outputs.

Technical Specifications

Empirical Engineering Insights

Alternative Models & Compatibility

The Pluto B46 v2 represents a direct enhancement over older v1 hardware generations. While it maintains full software backwards-compatibility within the Pluto Manager environment, mixed-generation safety buses require firmware alignment. Ensure that any networked legacy nodes are running updated firmware to prevent synchronisation fault codes on the CAN-based Pluto Safety Bus.

Application Pitfalls & Engineering Notes

When configuring the 16 dual-purpose non-failsafe outputs as failsafe inputs, pay close attention to the total current demand and leakage paths. If inductive safety devices or long cable runs are utilized, capacitive coupling may cause transient fault indications. For high-vibration applications, periodic mechanical inspection of the DIN-rail retention clips is recommended to prevent localized heating of the supply power terminals.

Commissioning & Wiring Tips

Always install standard 120-ohm terminating resistors at both physical ends of the Pluto Safety Bus trunk line. For optimal noise rejection in high-EMI environments (such as proximity to variable frequency drives), utilize double-shielded twisted pair cabling for the CAN lines and tie the shield to functional earth only at a single, centralized ground point.

Installation Guidelines

1. 1 Snap the Pluto B46 v2 securely onto a standard 35 mm DIN-rail inside an IP54 or higher rated control enclosure. Maintain a minimum of 10 mm lateral clearance from adjacent heat sources.
2. 2 Wire the dedicated 24 VDC control power lines using copper conductors rated for at least 75 degC, ensuring a stable, noise-free supply.
3. 3 Connect the required safety input devices, observing correct polarity and pulse-testing options as defined within your Pluto Manager software configuration.
4. 4 Connect the safety relay and solid-state outputs to your machine's primary control elements (e.g., contactor coils or safe torque off circuits).
5. 5 Power on the controller, connect via the programming interface, download the certified application logic, and run a complete functional validation test.