GE PACSystems RXi User Manual

Chapter 4. ConfigurationGFK-2816F August 2015 41Using the IDM to select Sweep modes and Communications Window ValuesYou can use the IDM to change the CPU sweep mode and values for the communicationswindows as follows:To access additional screens, touch the Next button.Note: For additional information related to IDM operation, refer to Section 3.6, IDM OperationalNotes.4.1.3 Controller Memory ParametersThe PACSystems user memory contains the application program, hardware configuration(HWC), registers (%R), bulk memory (%W), analog inputs (%AI), analog outputs (%AQ), andmanaged memory.Managed memory consists of allocations for symbolic variables and I/O variables. Thesymbolic variables feature allows you to create variables without having to manually locatethem in memory. An I/O variable is a symbolic variable that is mapped to a module’s inputsand outputs in the hardware configuration. For details on using symbolic variables and I/Ovariables, refer to 7.1 Variables.The amount of memory allocated to the application program and hardware configuration isautomatically determined by the actual program (including logic, C data, and %L and %P),hardware configuration, and symbolic variables created in the programming software. Therest of the user memory can be configured to suit the application. For example, an applicationmay have a relatively large program that uses only a small amount of register and analogmemory. Similarly, there might be a small logic program but a larger amount of memoryneeded for registers and analog inputs and outputs.Appendix C provides a summary of items that count against user memory.