If you are a Siemens PLC user then you've more then likely have run into Statement List (STL) programming. STL corresponds to the Instruction List language defined in the IEC 61131-3 specification.
The programming is done with very simple mnemonics that can be hard to remember if you don't use it very often. These cheat sheets provide a quick reference guide for all the instructions and formatting.
They are two pages long but if you can print on the front and back then they make for a nice one sheet reference. Download : PDF (131 KB) Download : PDF (140 KB) Source: plcdev.com
