Indirect addressing in STL (PDF)

In this tutorial we try to illuminate topic of indirect addressing in STL. We start with simple examples in SCL (for those who are more familiar with SCL language - for easier transition to STL).

• LESSON 1: WORKING WITH PLC’S MEMORY?
• TOPIC 1: PLC’s memory
• PLC AND ITS MEMORY
• TOPIC 2: Absolute addresses
• ADDRESSING BIT, BYTE, WORD, AND DOUBLE-WORD
• TOPIC 3: Indirect addressing
• POINTERS
• STL INSTRUCTIONS
• EXAMPLE 1: Absolute addresses in SCL
• TASK 1: Addressing individual Bit
• TASK 2: Addressing individual Byte
• TASK 3: Addressing individual Word
• TASK 4: Addressing individual Double-Word
• EXAMPLE 2: Absolute addresses in STL
• TASK 1: Addressing individual bit
• TASK 2: Addressing individual byte
• TASK 3: Addressing individual word
• TASK 4: Addressing individual double-word
• TASK 5: OPN instruction
• EXAMPLE 3: Going through data with index (SCL)
• TASK 1: Reading “elementary” data type from and writing it to array with index (in SCL)
• TASK 2: Reading “UDT” data type from and writing it to array of UDTs with index (in SCL)
• EXAMPLE 4: Going through data with pointer (STL)
• TASK 1: Reading “elementary” data type from and writing it to array with absolute addresses (in STL)
• TASK 2: Reading “elementary” data type from and writing it to array with absolute addresses (in STL)
• TASK 3: Reading “elementary” data type from and writing it to array with absolute addresses (in STL)
• EXPLAINING TASK 1, TASK 2 and TASK 3
• TASK 4: Using “Offset” in pointer
• TASK 5: Using +AR1 P#2.0 instruction
• TASK 6: Absolute addresses (in STL) and UDT’s