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The ABB Pluto B20 2TLA020070R0600 Programmable Safety Controller is a safety control unit used to monitor and manage safety-related functions in industrial machinery. It is part of the ABB Pluto safety controller platform and can coordinate safety inputs, logic processing, and safety outputs within a machine protection system.
The controller is used where emergency-stop devices, safety switches, light curtains, two-hand controls, and other safety-related devices must be evaluated before hazardous machine functions are permitted to operate. Its programmable architecture allows safety functions to be configured for the requirements of the machine or production cell.
In a typical installation, the Pluto B20 receives signals from safety devices, evaluates those signals using the configured safety logic, and controls connected safety outputs. The outputs can be used to stop or prevent the operation of motors, drives, contactors, valves, or other hazardous equipment.
The controller is generally installed as part of a complete machine safety system rather than as a replacement for standard PLC control. Standard automation equipment may manage production sequences, while the Pluto controller handles the dedicated safety functions required to protect operators and equipment.
| Parameter | Specification |
|---|---|
| Manufacturer | ABB |
| Model | Pluto B20 2TLA020070R0600 |
| Product Family | Pluto |
| Product Series | Pluto B20 |
| Product Type | Programmable Safety Controller |
| Primary Function | Safety input evaluation and programmable safety control |
| System Role | Machine safety control |
| Application | Industrial machinery and safety-control systems |
| Dimensions | 120 × 45 × 84 mm |
| Weight | 0.39 kg |
The Pluto B20 monitors connected safety devices and evaluates their status according to the configured safety program. When the safety conditions are satisfied, the controller can permit the associated machine function through its safety outputs.
Safety Devices → Pluto B20 Safety Controller → Safety Logic → Safety Outputs → Machine Shutdown / Enable Circuit
When an emergency stop, guard switch, light curtain, or other safety device detects an unsafe condition, the corresponding input state changes. The Pluto controller evaluates the condition and switches the configured safety outputs to the required safe state.
The safety outputs can then interrupt control power, remove an enable signal, stop a drive, de-energize a contactor, or activate another safety-related response. When the safety condition has been cleared, the controller follows the configured reset and restart conditions before allowing the machine to operate again.
The Pluto B20 does not replace the machine’s standard control program. It supervises safety-related conditions and provides the safety control response independently within the defined machine safety architecture.
The 2TLA020070R0600 occupies the safety-control layer of a machine automation system. It receives signals from protective devices and controls safety outputs that affect hazardous machine functions.
Safety Devices → Pluto B20 → Safety Outputs → Safety Relay / Drive Enable / Contactor → Machine Equipment
| System Element | Function |
|---|---|
| Emergency-Stop Device | Detects an emergency condition and requests a safe stop |
| Guard Switch | Monitors the position of a protective machine guard |
| Light Curtain | Detects access to a protected hazardous area |
| Pluto B20 | Evaluates safety inputs and executes configured logic |
| Safety Outputs | Switch the machine safety circuits to the required state |
| Safety Relay / Contactor | Disconnects or inhibits hazardous machine energy |
| Standard PLC | Executes normal machine sequencing and production logic |
| Motor / Drive / Actuator | Performs the controlled machine operation |
The safety controller can work with standard automation equipment, but the safety function must remain consistent with the complete machine risk assessment and safety design.
| Application | Typical Use |
|---|---|
| Packaging Machinery | Emergency-stop and guard monitoring |
| Assembly Machines | Safety control for access doors and protective devices |
| Conveyor Systems | Safe stopping and restart control |
| Machine Tools | Monitoring guards, emergency stops, and operator controls |
| Robotic Cells | Safety monitoring around robot work areas |
| Material Handling | Protective-device evaluation for automated equipment |
| Production Lines | Coordinated safety functions across machine sections |
| Industrial Machinery | Programmable safety logic for hazardous machine functions |
| Component | Function |
|---|---|
| ABB Pluto Safety Devices | Provide safety-related input signals |
| Emergency-Stop Pushbuttons | Initiate emergency machine stopping |
| Guard Switches | Monitor protective door and guard positions |
| Safety Light Curtains | Detect access to hazardous areas |
| Two-Hand Control Devices | Require coordinated operator input |
| Safety Relays | Interface safety outputs with machine shutdown circuits |
| Contactors | Disconnect hazardous electrical power |
| Variable Speed Drives | Stop or inhibit motor operation through safety circuits |
| Standard PLC | Executes normal machine-control logic |
| HMI / Operator Panel | Provides operating information and reset interaction |
| Model / Product Family | Product Type | Typical Application |
|---|---|---|
| ABB Pluto Safety Controller | Programmable Safety Controller | Machine safety control |
| ABB Pluto B20 Series | Safety Controller | Safety input and output management |
| ABB Pluto B22 Series | Safety Controller | Expanded machine safety applications |
| ABB Pluto B46 Series | Safety Controller | Larger safety-control architectures |
| ABB Pluto Safety I/O | Safety I/O Component | Safety signal expansion |
| ABB Safety Relays | Safety Relay | Safety circuit switching |
| ABB Jokab Safety Components | Machine Safety Equipment | Emergency-stop and protective-device systems |
The controller can be used with safety-related devices such as emergency-stop pushbuttons, guard switches, light curtains, two-hand controls, and other compatible protective devices. The actual functions depend on the configured safety program and the machine safety design.
A standard PLC generally manages normal machine sequencing and production control, while the Pluto B20 evaluates safety-related conditions and controls configured safety outputs. The two systems may exchange information but perform different roles within the machine architecture.
The configured reset conditions may not yet be satisfied. Possible causes include another active safety input, an open guard circuit, an emergency-stop condition, a feedback fault, an incorrect reset sequence, or a configuration issue. The controller diagnostics and complete safety circuit should be checked.
The replacement should be checked for the correct part number, safety program, wiring, input assignments, output assignments, and connected protective devices. Each safety function should then be tested individually, followed by a complete machine safety validation before normal operation resumes.