Allen-Bradley 20-750-S4 PowerFlex 750 Integrated Safety Function Module

Product Overview

The Allen-Bradley 20-750-S4 is a PowerFlex 750 Series Integrated Safety Function Option Module from Rockwell Automation. It is used with PowerFlex 755 AC drives to provide advanced safety functions through network communication. It is not an HIM (Human Interface Module); it is a drive safety option module.

The module enables safety-related drive control functions such as Safe Torque Off (STO), Safe Stop, Safe Speed, and other integrated safety functions when connected with compatible safety controllers.

Main Specifications

• Manufacturer: Allen-Bradley (Rockwell Automation)
• Model: 20-750-S4
• Series: PowerFlex 750 Series
• Product Type:
  • Integrated Safety Function Module
  • Drive Safety Option Module
  • PowerFlex Safety Interface
• Compatible Drives:
  • PowerFlex 755 AC Drives
  • PowerFlex 755T Series (depending on configuration)
• Communication:
  • Integrated safety over EtherNet/IP
  • CIP Safety communication
• Safety Functions:
  • Safe Torque Off
  • Safe Stop
  • Safe Speed related functions
  • Other configurable safety functions
• Safety Level:
  • Up to SIL 3
  • Performance Level e (PL e)
  • Category 4 (system dependent)

Technical Functions

The 20-750-S4 provides:

• Safety monitoring of PowerFlex drive operation
• Prevention of unexpected motor torque generation
• Safe machine shutdown functions
• Communication between safety PLC and drive
• Reduction of external safety relay hardware

Working principle:

Safety PLC → EtherNet/IP CIP Safety → 20-750-S4 → PowerFlex 755 Drive → Motor

Features & Advantages

• Original Allen-Bradley PowerFlex 750 safety accessory
• Integrated safety control through network communication
• Reduces additional safety wiring
• Supports modern machine safety architectures
• Improves system diagnostics
• Compatible with GuardLogix safety controllers
• Suitable for high-performance automation systems

Applications

Used in:

• Industrial automation systems
• Robotic production lines
• CNC machinery
• Packaging equipment
• Material handling systems
• Automotive manufacturing

Typical applications:

• Emergency stop integration
• Safety door monitoring
• Safe machine stopping
• Safe motion control

Compatible Equipment

Commonly used with:

• Allen-Bradley PowerFlex 755 AC drives
• GuardLogix Safety Controllers
• ControlLogix PLC systems
• EtherNet/IP safety networks
• Studio 5000 Logix Designer