ISO/TR 22053:2021

Overview

ISO/TR 22053:2021 - Safety of machinery - Safeguarding supportive system (SSS) - provides guidance for the design and integration of a safeguarding supportive system (SSS) used with integrated manufacturing systems (IMS). The technical report explains how an SSS can provide mode selection as part of safety-related parts of a control system (SRP/CS) or add a layer of personnel authentication and authorization to IMS designed according to ISO 11161. This guidance is intended to be used alongside ISO 11161 and does not cover personnel qualification or competency.

Key topics and technical requirements

• Purpose and scope
  • SSS is a complementary protective measure - used in conjunction with, not in place of, guards and protective devices.
  • Targets tasks in hazard zones where human factors increase risk (set‑up, adjusting, maintenance, teaching, troubleshooting).
• Primary SSS functions
  • Identification of authorized personnel (authentication).
  • Verification that requested task matches personnel authorization.
  • Displaying authorized tasks and accessible zones.
  • Enabling the appropriate operating mode (mode selection) via SRP/CS inputs.
• System components
  • Identification elements: ID devices (biometric cameras, RFID/tag readers, barcode, key switches) and authorized personnel IDs.
  • Human–SSS interface (HMI): request input, status feedback, audible/visual indications of access paths, selected task and authorization outcome.
  • Logic unit: authenticates credentials against a credential database and provides outputs to SRP/CS.
  • Credential database: local or remote resource defining permissions, modes and task associations.
• Interfaces and safety functions
  • Interface between SSS and SRP/CS must support enabling/disabling safety functions (e.g., restart, reset, guard‑lock release).
  • Mode selection enabled by SSS is a safety function requiring SRP/CS performance assessment per ISO 13849‑1.
• Design validation
  • Risk assessment and verification/validation required per ISO 12100 and ISO 13849 series.

Practical applications and users

• Typical applications: machine builders and OEMs adding access control for local operations; system integrators implementing IMS mode selection; factories reducing human error during maintenance and setup; safety teams coordinating access to control zones.
• Primary users:
  • Safety engineers and system integrators
  • Machinery designers and OEMs
  • Plant managers and employers responsible for machinery safety
  • Compliance auditors and technical writers preparing safety documentation

Related standards

• ISO 11161 (IMS requirements)
• ISO 12100 (risk assessment and reduction)
• ISO 13849‑1 / ISO 13849‑2 (SRP/CS performance)
• ISO 14119 (interlocking devices)
• ISO 20607 (instructions for use)
• ISO/TR 22100‑4 (IT/cyber considerations)

Keywords: ISO/TR 22053:2021, safeguarding supportive system, SSS, safety of machinery, IMS, ISO 11161, SRP/CS, authentication, authorization, ISO 13849-1, risk assessment.