Otherwise known as Siemens speak. Here's a list of Siemens specific abbreviations and their meanings.
| Term | Description | Explanation |
| C7 | Combo PLC/HMI system | A PLC and screen in one package |
| CFC | Continuous Function Chart | Optional programming language |
| CP | Communication Processor | Modules used for special communication protocols |
| DB | Data Block | Memory storage areas for user data |
| FB | Function Block | A function with it's own data block |
| FBD | Function Block Diagram | Standard programming language |
| FC | Function Call | Called progammed blocks |
| FM | Function Module | Modules with special functions (e.g. positioning) |
| GSD | Generic Station Description | Files used for Profibus descriptions |
| HiGraph | Optional programming language | |
| IM | Interface Module | Modules to connect remote racks |
| LAD | Ladder Logic Diagram | Standard programming language |
| M7 | Programmable modules | A module with processing capabilities |
| MMC | Micro Memory Card | Compact plug-in memory card |
| MPI | Multi Point Interface | Standard communication protocol |
| OB | Organization Block | Blocks for user programs based on different operating system events. |
| OP | Operator Panel | Simple display with or without buttons |
| PCS | Process Control System | Software for the entire process chain |
| PG | Programming Terminal | Dedicated Siemens device - basically a PC |
| PPI | Point to Point Interface | Serial RS-232 communication |
| Profibus DP | Profibus Decentral Peripherals | Networking protocol used for factory automation |
| Profibus PA | Profibus Process Automation | Networking protocol used for process automation |
| S7 | SIMATIC Step 7 product line | |
| SCL | Structured Control Language | Optional programming language |
| SFB | System Function Block | Integrated FB for CPU information |
| SFC | System Function Call | Integrated FC for CPU information |
| SM | Signal Module | Standard Input/Output modules |
| STL | Statement List | Text based programming language |
| TP | Touch Panel | Touch screen display |
| UDT | User-Definded Data Type | Special data structures defined by the user |
| VAT | Variable Access Table | Tables used to monitor/modify values in the PLC |