Chapter 2. CPU Features & Specifications18 PACSystems* RX7i, RX3i and RSTi-EP CPU Reference Manual GFK-2222AD2.1 Common CPU Features2.1.1 Features Shared by All PACSystems CPU Models▪ Programming in Ladder Diagram, Function Block Diagram, Structured Text and C.▪ Floating point (real) data functions.▪ Configurable data and program memory.▪ Non-volatile built-in flash memory for user data (program, configuration, register data, andsymbolic variable) storage. Use of this flash memory is optional.▪ Configurable RUN/STOP Mode switch.▪ Embedded serial and/or Ethernet communications (refer to comparison charts in RX3i CPUFeatures and Specifications, RX7i CPU Features and Specifications and RSTi-EP CPU Features andSpecifications).▪ Up to 512 program blocks. Maximum size for a block is 128KB.▪ Auto Located Symbolic Variables, which allows you to create a variable without specifying areference address.▪ Bulk memory area accessed via reference table %W. The upper limit of this memory area can beconfigured to the maximum available user RAM.▪ Larger reference table sizes, compared to Series 90* CPUs: 32Kbits for discrete %I and %Q andup to 32K words each for analog %AI and %AQ.▪ Online Editing mode that allows you to easily test modifications to a running program. (Fordetails on using this feature, refer to the programming software online help and Proficy LogicDeveloper Getting Started, GFK-1918.)▪ Bit in word referencing that allows you to specify individual bits in a WORD reference in retentivememory as inputs and outputs of Boolean expressions, function blocks, and calls that accept bitparameters.▪ In-system upgradeable firmware for CPU▪ Indirect mechanism for upgrading firmware in backplane modules via the CPU.