| A&E | Alarms and Events |
| ACL | Access Control list |
| ACSE | Application Control Service Element |
| ACT | Access Control List |
| APC | Advanced Process Control |
| APDU | Application Protocol Data Unit |
| ARP | Address Resolution Protocol |
| ARPA | Advanced Research Projects Agency |
| ASCII | American Standard Code for Information Interchange |
| ASDU | Application Service Data Element |
| CEU | Continuing Education Unit |
| CCRC | Cyclical Redundancy Check |
| COM | Component Object Model |
| COTP | Connection-Oriented Transport Protocol |
| CRC | Cyclical Redundancy Check |
| DA | Data Access |
| DCOM | Distributed Component Object Model |
| DCS | Distributed Control System |
| DDE | Dynamic Data Exchange |
| DHS | Department of Homeland Security |
| DNP | Distributed Network Protocol |
| DP | Distributed Peripherals |
| EMS | Energy Management System |
| FDL | Fieldbus Data Link Layer |
| FMS | Fieldbus Message Specification |
| FTP | File Transfer Protocol |
| HDA | Historical Data Access |
| HMI | Human-Machine Interface |
| HP | Hewlett Parkard |
| HTTP | Hypertext Transfer Protocol |
| IACET | International Association for Continuing Education and Training |
| ICCP | Inter-Control Center Communications Protocol |
| ICS | Industrial Control System |
| IEC | International Electrotechnical Commission |
| IED | Intelligent Electronic Device |
| IETF | Internet Engineering Task Force |
| IP | Internet Protocol |
| IPSec | Internet Protocol Security |
| IT | Information Technology |
| I/O | Inputs/Outputs |
| LAN | Local Area Network |
| MiTM | Man-in-the-Middle |
| MBAP | Modbus Application Protocol Header |
| OLE | Open Linking and Embedding |
| OPC | Open Platform Communication |
| OSI | Open System Interconnection |
| PA | Process Automation |
| PAC | Programmable Automation Controller |
| PCS | Process Control System |
| PDU | Protocol Data Unit |
| PLC | Programmable Logic Controller |
| PPDU | Presentation Protocol Data Unit |
| RPC | Remote Procedure Call |
| RS | Recommended Standard (e.g. RS232) |
| RTU | Remote Terminal Unit |
| SCADA | Supervisor Control and Data Acquisition |
| SDLC | Software Development Life Cycle |
| SDU | Service Data Unit |
| SOA | Services-Oriented Architecture |
| SPDU | Session Protocol Data Unit |
| SQL | Structured Query Language |
| SSL | Secure Sockets Layer |
| TASE | Telecontrol Application Service Element |
| TCP | Transmission Control Protocol |
| TCP/IP | Transmission Control Protocol/Internet Protocol |
| TCP/UDP | Transmission Control Protocol/User Datagram Protocol |
| TPDU | Transport Protocol Data Unit |
| TPKP | ISO Transport Services on top of the TCP |
| UA | Unified Architecture |
| UDL | Universal Data Link |
| UDP | User Datagram Protocol |
| URL | Uniform Resource Locator |
| VLAN | Virtual Local Area Network |
| VPN | Virtual Private Network |
| WAN | Wide Area Network |
Acronyms