Virtual placeholder configuration for distributed input/output modules
A modular distributed I/O system for an industrial automation network that allows one or more modules of an island to be omitted without requiring reconfiguration of the system by maintaining a consistent I/O image representation of the distributed I/O network for various physical distributed I/O configurations, and managing reconfiguration changes using Virtual Placeholder objects.
1. A system for configuring a process image in an automation network, the system comprising:
a physical island having a network interface module, the physical island further including a plurality of input/output (I/O) modules,
wherein configuration software run by the network interface module maintains a consistent process image for various distributed I/O configurations having one or more I/O modules of the plurality of I/O modules physically removed from the system using virtual placeholders, and
wherein said configuration software generates a translation table that provides a correlation between node addresses of the physical island and node addresses of a logical island model of said physical island, wherein an I/O module of the plurality of I/O modules in a physical slot X having node ID X is presented outside the physical island as if that I/O module were located in slot Y.
2. A method of configuring a process image of a physical island, the method comprising:
providing the physical island having a network interface module and a plurality of ports, each of the plurality of ports capable of connection to one of a plurality of input/output (I/O) modules;
connecting at least one of the plurality of I/O modules to at least one of the plurality of ports; and,
creating the process image of the physical island that indicates whether each of the plurality of I/O modules is physically present and not present using virtual placeholders,
wherein the creating the process image further includes generating a translation table that provides a correlation between node addresses of the physical island and node addresses of a logical island model of said physical island, wherein an I/O module of the plurality of I/O modules in a physical slot X having node ID X appears in the logical island model as if that I/O module were located in slot Y and wherein an I/O configuration of the physical island maintains a consistent process image for various physical distributed I/O configurations having one or more I/O modules of the plurality of I/O modules physically removed.
3. The system of claim 1 , wherein said configuration software provides for an indication of one or more I/O modules of the plurality of I/O modules selected by a user to be physically not present in the physical island to be displayed with particular indicia indicating an absence, such that the one or more I/O modules indicated as being physically not present are distinguishable from other I/O modules indicated as being physically present.
4. The system of claim 1 , wherein said configuration software provides a user with functionality to create the logical island model of said plurality of I/O modules comprising the physical island, such that the logical island model can be tested against particular design rules and application requirements.
5. The system of claim 4 , wherein said translation table is downloaded and stored in said network interface module as part of configuration data.
6. The method of claim 2 , wherein the creating the process image includes:
(a) creating the logical island model using the virtual placeholders, and
(b) determining the logical node addresses for each of the plurality of I/O modules.
7. The method of claim 2 , further comprising: providing for an indication of one or more I/O modules of the plurality of I/O modules selected by a user to be physically not present in the physical island to be displayed with particular indicia indicating an absence, such that the one or more I/O modules indicated as being physically not present are distinguishable from other I/O modules indicated as being physically present.
8. The method of claim 2 , wherein the creating the process image includes determining the logical node addresses for each of the plurality of I/O modules.
9. A non-transitory computer-readable storage medium having computer-executable program instructions stored thereon that when executed by a processor, cause the processor to perform a method comprising:
providing a physical island having a network interface module and a plurality of ports, each of the plurality of ports capable of connection to one of a plurality of input/output (I/O) modules;
connecting at least one of the plurality of I/O modules to at least one of the plurality of ports; and,
creating a process image of the physical island that indicates whether each of the plurality of I/O modules is physically present and not present using virtual placeholders,
wherein the creating the process image further includes generating a translation table that provides a correlation between node addresses of the physical island and node addresses of a logical island model of said physical island, wherein an I/O module of the plurality of I/O modules in a physical slot X having node ID X appears in the logical island model as if that I/O module were located in slot Y and wherein an I/O configuration of the physical island maintains a consistent process image for various physical distributed I/O configurations having one or more I/O modules of the plurality of I/O modules physically removed.
10. The non-transitory computer-readable storage medium of claim 9 , wherein the translation table is downloaded to the network interface module.
11. The non-transitory computer-readable storage medium of claim 9 , wherein the processor further performs: routing error messages to a predetermined logical address based on the virtual placeholders.
12. The non-transitory computer-readable storage medium of claim 9 , wherein the creating the process image includes determining the logical node addresses for each of the plurality of I/O modules.
13. The non-transitory computer-readable storage medium of claim 9 , wherein the processor further performs: providing for an indication of one or more I/O modules of the plurality of I/O modules selected by a user to be physically not present in the physical island to be displayed with particular indicia indicating an absence, such that the one or more I/O modules indicated as being physically not present are distinguishable from other I/O modules indicated as being physically present.
14. The non-transitory computer-readable storage medium of claim 9 , wherein the creating the process image includes:
(a) creating the logical island model using the virtual placeholders, and
(b) determining the logical node addresses for each of the plurality of I/O modules.