US 2011/0283070 A1 · Method to Separate and Persist Static and Dynamic Portions of a Control Application

Abstract

The subject matter disclosed herein describes a method of allocating and persisting memory in an industrial controller without requiring a battery backup or a large capacitive storage system. Each data object is identified as static or dynamic. Static objects are further classified by whether frequent access of that data object is required. Each of the data objects is stored in non-volatile memory. The dynamic data objects and static data objects requiring frequent access are stored in volatile memory. A record of static data objects is maintained in non-volatile memory and a record of dynamic data objects is maintained in volatile memory. Upon power loss, the present value of each dynamic data object is copied to non-volatile memory. When power is restored, the values of both the dynamic data objects and the static data objects that require frequent access at run-time are copied from non-volatile memory to volatile memory.

Claims21

Dependent claims

A method of retaining a plurality of data objects in memory in an industrial controller having both a volatile memory and a non-volatile memory, comprising the steps of:

classifying each of the data objects as a static data object or a dynamic object, wherein each static data object is changed at a frequency less than a preselected threshold frequency and each dynamic object is changed at a frequency greater than a preselected threshold frequency;
storing each static data object in the non-volatile memory;
storing each dynamic data object and at least a portion of the static data objects in the volatile memory;
updating the dynamic data object in the volatile memory when each dynamic data object changes;
for the portion of static data objects stored in the volatile memory, tracking the change of the static data object and updating the static data object in the volatile memory when the static data object changes;
copying the present value of each dynamic object in the volatile memory to the non-volatile memory when power is removed from the controller.

3 more elements

Dependencies are inferred from the claim text.

Method to Separate and Persist Static and Dynamic Portions of a Control Application

Life of this patent

Method to Separate and Persist Static and Dynamic Portions of a Control Application

Life of this patent

Abstract

Claims21