The invention provides improved methods and apparatus for control using field and control devices that provide a virtual machine environment and that communicate via an IP network. By way of non-limiting example, such field device can be an “intelligent” transmitter or actuator that includes a low power processor, along with a random access memory, a read-only memory, FlashRAM, and a sensor interface. The processor can execute a real-time operating system, as well as a Java virtual machine (JVM). Java byte code executes in the JVM to configure the field device to perform typical process control functions, e.g., for proportional integral derivative (PID) control and signal conditioning. Control networks can include a plurality of such field and control devices interconnected by an IP network, such as an Ethernet.

Methods and apparatus for control using control devices that provide a virtual machine environment and that communicate via an ip network

Methods and apparatus for control configuration with versioning, security, composite blocks, edit selection, object swapping, formulaic values and other aspects

Connection objects or other such data structures facilitate establishing and configuring connections between objects that model components in a process control system. A first set of data structures (e.g. the object connection type structures) identify valid types for component-to-component pairings and the respective roles of each component in the pairing (e.g., parent or child, source or sink). A second set of data structures (e.g., the parameter connection type structures) supply similar information for parameter-to-parameter connections. Together, these data structures can be used, for example, to validate component-to-component connections suggested by the user and to automatically configure parameter-to-parameter connections. Actual connections, both at the component or parameter level, are reflected using parameter overrides within the parameterized object model—with which the connection objects are constructed.

Process control configuration system with connection validation and configuration

The invention provides improved apparatus for configuring process, environmental, industrial and other control systems. Such apparatus employs “appearance” objects (or other data and/or programming constructs) defining the appearance of configurable system components in graphical editors or other views in which the components may be depicted. “Placeholder” objects (or other constructs) persist the location, size, color, or other aspects of appearance defined by an appearance object for a configurable component in views in which it is actually depicted. By way of example, a process control configuration apparatus according to this aspect of the invention uses “configurable” objects to define blocks, loops and other components of a process control system. Appearance objects provide (or reference) icons or representations indicating how the configurable objects are to be depicted, e.g., in a configuration editor. Placeholder objects are created for each configurable object that is placed in a configuration using that editor. The placeholder objects identify the sizes, locations, colors, etc., of the icons used in the editor to represent the configurable objects.

Methods and apparatus for controlling object appearance in a process control configuration system

A system for process control comprises a server digital data processor and a client digital data processor that are coupled by a network, such as the Internet or an Intranet. The server digital data processor, which is additionally coupled to a control/sensing device and any associated interface equipment (collectively, referred to as “process control apparatus”), includes a command processor that transfers information between the network and the process control apparatus. The client digital data processor includes an information client (e.g., a so-called Internet web browser) capable of requesting and receiving an applet from the server digital data processor. The information client, further, defines a hardware-independent and operating system-independent virtual machine environment within the client digital data processor. The client digital data processor executes, within that virtual machine environment, an applet for configuring the client digital data processor as a “process controller” that establishes communications over the network with the command processor and that monitors and/or controls the process control apparatus via those communications.

Methods and apparatus for remote process control

A communications adapter receives and transmits simultaneously packet and/or isochronous data between two interfaces; a network and a host bus system. The adapter stores the isochronous and packet data in receive and transmit queues configured in a FDDI RAM buffer. A controller manages the transfers of the data into and out of the queues. A local bus interacts with the system to provide descriptors of addresses in the system for transfers of data out of the queues to the system or the network. The controller is programmable to provide a variable threshold for the transfer of data between the queues and the system or the network. A systems interface unit handles the transfer of data to/from the system and allows data to bypass the queues and directly access the system or the network.

Multimedia system and method of controlling data transfer between a host system and a network adapter using a DMA engine

A fault-tolerant computer system having shadow registers for storing the contents of a primary array into a shadow array at the completion of a stored instruction execution. This is accomplished in one clock cycle with all registers being shadowed simultaneously. During rollback of execution steps for a checkpoint retry, the shadow register files provide a signal cycle unload of the shadow array into the primary array. LSSD latches are used in the shadow register file.

Shadow register file for instruction rollback

Multimedia communication apparatus and methods

Communication apparatus and methods having P-MAC, I-MAC engines and buffer bypass for simultaneously transmitting multimedia and packet data

A method of switching multimedia data streams in response to requests to allocate or deallocate a user on a network receiving those data streams is herein described. The data streams are transmitted in master cycles, portions of each master cycle being allocated to each user. The relationship between the user and the portion of the master cycle is kept track of by means of a matrix method.

Switching of multiple multimedia data streams

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