ABB Pluto S20 V2 CFS Programmable Safety PLC for Machine Safety Systems

Product Overview

The ABB Pluto S20 V2 CFS is a programmable safety controller from ABB's Pluto series, designed for implementing safety functions in industrial machinery. This compact unit integrates 20 digital inputs and 8 digital safety outputs (solid-state), providing a complete safety logic solution without requiring external expansion modules for many applications. The Pluto S20 V2 CFS is certified for Safety Integrity Level 3 (SIL 3) according to IEC 61508 and Performance Level e (PL e) according to ISO 13849-1, making it suitable for the highest risk reduction requirements. The controller is programmed using ABB's Pluto Manager software, which uses a graphical function block diagram (FBD) language tailored for safety logic.

Key Features of Pluto S20 V2 CFS

The controller features 20 safe digital inputs rated at 24 V DC, with built-in test pulse outputs for cross-circuit detection. It provides 8 dual-channel safe outputs (solid-state, 2 A per channel) capable of directly driving contactors and safety valves. The unit includes 2 test pulse outputs and auxiliary outputs for status signaling. The Pluto S20 V2 CFS supports both local and remote I/O expansion via the Pluto bus, allowing up to 128 additional I/O points. The controller has a built-in real-time clock for event logging and an RS-232/RS-485 port for configuration and diagnostic access.

The housing is rated IP20 and is designed for DIN rail mounting. The operating temperature range is -10 to 55°C. The unit is powered by 24 V DC and consumes 5 W. It includes LED indicators for power, run, fault, and I/O status. The Pluto S20 V2 CFS is certified by TÜV for functional safety and complies with global standards including CE, UL, and CCC. The controller can be used for emergency stop monitoring, guard door interlocking, light curtain control, two-hand control, and safety mat monitoring. The programming software includes pre-validated function blocks for common safety applications, reducing engineering time.

Technical Specifications

• Manufacturer: ABB (formerly Jokab Safety)

• Part Number: Pluto S20 V2 CFS (2TLA020070R4700)

• Series: Pluto

• Product Type: Programmable Safety PLC

• Safety Inputs: 20 (24 V DC, with test pulses)

• Safety Outputs: 8 (solid-state, 2 A each)

• Test Pulse Outputs: 2

• Auxiliary Outputs: 4 (semiconductor)

• Expansion: Up to 128 additional I/O via Pluto bus

• Safety Level: SIL 3 (IEC 61508), PL e (ISO 13849-1)

• Programming Software: Pluto Manager

• Programming Language: Function block diagram (FBD)

• Communication Ports: RS-232, RS-485 (service and expansion)

• Real-Time Clock: Yes

• Power Supply: 24 V DC (±15%)

• Power Consumption: 5 W

• Operating Temperature: -10 to +55 °C

• Degree of Protection: IP20

• Mounting: DIN rail (35 mm)

• Certifications: TÜV, CE, UL, CCC

Functional Description

The Pluto S20 V2 CFS continuously executes the safety logic program stored in its non-volatile memory. Inputs are read, the function block diagram is evaluated, and outputs are updated. The test pulse outputs are used to detect short circuits and cross faults on input wiring. The safety outputs are monitored internally for faults; if a failure is detected, the controller enters a safe state. The program can be uploaded, downloaded, and monitored via the RS-232 port using Pluto Manager. The real-time clock time-stamps safety events and alarms for maintenance records. The controller can be configured for automatic or manual reset.

Applications

The ABB Pluto S20 V2 CFS is used in machinery safety systems including emergency stop circuits, guard door monitoring, light curtain control, safety mat integration, and two-hand control stations. It is suitable for packaging machines, robotic cells, conveyor systems, and woodworking equipment.