List of abbreviations
| CA | Certification Authority |
| CRL | Certificate Revocation List |
| CSR | Certificate Signing Request |
| DMZ | Demilitarized Zone |
| FR | Foundational Requirement |
| HTTPS | Hypertext Transfer Protocol Secure |
| ICS | Industrial Control System |
| ISMS | Information Security Management System |
| IT | Information Technology |
| NAT | Network Address Translation |
| OT | Operational Technology |
| PAT | Port and Address Translation |
| PKI | Public Key Infrastructure |
| PSK | Pre-shared Key |
| SPLC | Left-alignable, safety-oriented control for operating PROFIsafe® devices |
| SPLCProxy | A layer that is providing security extensions, dedicated safety roles and file system access rights to protect the SPLC (see Security and safety hardening). |
| SR | System Requirements |
| TLS | Transport Layer Security |
| VPN | Virtual Private Network |
• Published/reviewed: 2026-02-23 • Revision 021 •