摘要:
A method and system for assigning slot addresses to modules in a fault tolerant industrial control system includes a pair of backplane switches on each base. Each backplane switch is configured to communicate between one backplane and the modules located on the base and to communicate between backplane switches located at adjacent bases. A backplane switch on a bank master base first assigns a base address and slot addresses to itself. The backplane switches on each additional base initiate transmission of a base address request. A base address response, including a base address and slot numbers for the adjacent base, is transmitted after a base has its own address assigned. Each base repeats the process in sequence along the bank, incrementing the base address by one and the slot address by the number of slots on the base and passing the new base and slot addresses along the bank.
摘要:
A device is configured to be operable in a plurality of network environments. A number of different configurations are available to be set on the device, where a first configuration enables operation on a first network, and a second configuration enables operation on a second, disparate, network. A plurality of external ports in conjunction with a multiplexer switch, network switch, internal CPU, external CPU, routing links, etc., can be combined to facilitate multiple configurations for the device. The device is suitable for incorporation into a human machine interface, for application in an industrial processing operation. Receive port information can be incorporated into a data frame to facilitate identification of an external port associated with the reception of the data frame. Applicable networks include linear topology, ring topology, star topology, Ethernet, ROCKWELL NEO, EtherNet/IP, one or more LANs, etc. Configuration can be via a USB device or an interface.
摘要:
The subject matter disclosed herein describes a method to allocate and prioritize data communications on an industrial control network. A transmission schedule (28) including multiple priority windows and multiple queues (Q) is established. Each queue (Q) is assigned to at least one priority window, and each priority window may have multiple queues (Q) assigned thereto. A control device (10) communicating on the control network (12) transmits data packets according to the transmission schedule (28). Within each priority window, data packets corresponding to one of the queues (Q) assigned to the priority window may be transmitted. The data packets may be transmitted at any point during the priority window, but will only be transmitted if no data packet from a higher queue (Q) is waiting to be transmitted.
摘要:
Fault-tolerant Ethernet is provided through the use of special interfaces (14a,b) providing duplicate ports that may be alternatively enabled with the same network address. A switching between the ports, corrects for single faults in a two-way redundant system (16a,b) without time-consuming reconfiguration of other end devices (12a-e) or the need for complex middleware in the end devices (12a-e).
摘要:
A high-speed security device for network connected industrial controls provides hybrid processing in tandem hardware and software security components. The software security component establishes state-less data identifying each packet that requires high-speed processing and loads a data table in the hardware component. The hardware component may then allow packets matching data of the data table to bypass the software component while passing other non-matching packets to the software component for more sophisticated state analysis.
摘要:
A device is configured to be operable in a plurality of network environments. A number of different configurations are available to be set on the device, where a first configuration enables operation on a first network, and a second configuration enables operation on a second, disparate, network. A plurality of external ports in conjunction with a multiplexer switch, network switch, internal CPU, external CPU, routing links, etc., can be combined to facilitate multiple configurations for the device. The device is suitable for incorporation into a human machine interface, for application in an industrial processing operation. Receive port information can be incorporated into a data frame to facilitate identification of an external port associated with the reception of the data frame. Applicable networks include linear topology, ring topology, star topology, Ethernet, ROCKWELL NEO, EtherNet/IP, one or more LANs, etc. Configuration can be via a USB device or an interface.
摘要:
Aspects of the present invention provide a device, method and system which utilize hardware-based granular evaluation of industrial control protocol packets to withstand traffic storms. In an embodiment, packet evaluation circuitry coupled to a port may be adapted to evaluate one or more protocol fields contained in each inbound packet before switching circuitry can send the unbound packet to the proper destination. The inbound packet may be sent by the switching circuitry if it is a particular message, or may be selectively inhibited from being sent by the switching circuitry if the inbound packet does not contain the particular message for being sent and if the total number of bytes of the inbound packet type exceeds a threshold for the outbound port during a given period of time. As such, critical industrial applicatians may continue to operate in the presence or a traffic storm.