Handling of Remanent Variables for AC500 V3 Products

All operands supported by IEC 61131-3 editor are described in the : Configuring I/O LinksMemory Sizes: Memory Sizes

This part of the documentation describes the declaration of remanent variables for AC500 V3 products.

Note

:strong:Different handling of remanent variables in AC500 FW ≥V3.0.2

• No more %R memory area (use instead %M with {no_init} Handling of Remanent Variables for AC500 V3 Products)
• Creating of addresses for “VAR RETAIN PERSISTENT” variables automatically by IEC-Compiler

• Adding a Global List of Persistent/Retain Variables
• Declaring a new Variable in Global List
• Declaring a new Persistent/Retain Variable in Local POU
• Initialization of %M Variables
• Behavior of Retain Variables
• PLC Shell Command for Import and Export of Retain/Persistent Variables
• Import and Export of Retain/Persistent Variables by Library Functions
  • SRAM_IMPORT
  • SRAM_EXPORT
  • SRAM_CLEARED