Enable Output in SCL, LAD, STL (PDF)

In this short tutorial we try to illuminate topic of ENO (Enable Output) in SCL, LAD and STL. We investigate Status Word and its bits and how to use them (focus on BR bit). We start with simple examples in SCL and LAD and then move to STL. 

• LESSON 1: ENABLE OUTPUT
• TOPIC 1: Background Information
• STATUS BITS
• SAVE INSTRUCTION
• NOTE: S7-300 & S7-400
• EXAMPLE 1: Enable Output (ENO) – SCL
• EXAMPLE 2: Enable Output (ENO) – LAD
• EXAMPLE 3: Enable Output (ENO) – STL
• TASK 1: ENO := Always TRUE
• TASK 2: ENO := Always FALSE
• TASK 3: ENO based on function’s result