摘要:
This invention provides a control device that can efficiently perform priority-dependent data transmission through a communication line and a control method aimed at the priority-dependent data transmission. The control device includes a transmitter that transmits data as a frame to another unit through the communication line and a generator that generates the data to be transmitted to another unit. When the higher-priority data to be transmitted is generated in a receiver or a controller while the transmitter transmits a first frame, the transmitter transmits a second frame including the higher-priority data to be transmitted after transmitting a first frame up to a predetermined block.
摘要:
The present invention provides a communication master station startup period control method of being able to securely prevent malfunction of a PLC system, even if at least two communication master stations are connected to the PLC system which permits only one communication master station on the network. After the startup, when it is determined that the communication master stations exist redundantly by a master plurality determination process performed in advance of a link establishment process, the transition to a predetermined master plurality avoidance process is made without making the transition to the link establishment process. Further, when it is determined that the communication master stations exist redundantly by the master plurality determination process performed in parallel with the link establishment process, the transition to the predetermined master plurality avoidance process is made without making the transition to an operation state.
摘要:
The present invention provides a communication master station startup period control method of being able to securely prevent malfunction of a PLC system, even if at least two communication master stations are connected to the PLC system which permits only one communication master station on the network. After the startup, when it is determined that the communication master stations exist redundantly by a master plurality determination process performed in advance of a link establishment process, the transition to a predetermined master plurality avoidance process is made without making the transition to the link establishment process. Further, when it is determined that the communication master stations exist redundantly by the master plurality determination process performed in parallel with the link establishment process, the transition to the predetermined master plurality avoidance process is made without making the transition to an operation state.
摘要:
A network system is formed with a parent station and programmable controllers and a programmable display devices serving as child stations connected to a single general-purpose serial communication circuit. Whichever child station received the token from the parent station outputs a command. Data are exchanged between the programmable display device and any of the programmable controllers by command-response communication. Data are exchanged among the programmable controllers by data link operations.
摘要:
A communication network for programmable logic controllers (PLCs) wherein selected memory means (16) of each PLC have at least two ports directly accessible by other PLCs and certain registers of the PLCs are identical to enable efficient, high-speed transfer (30) of block of data between the PLCs.
摘要:
A method for interacting master and slave information in real time, comprising: collecting, by N slave control MCUs, sensor signals of sensors respectively connected thereto; feeding back, by the N slave control MCUs, the sensor signals to a master control MCU via a signal transfer panel; and when the sensor signals satisfy a pre-set condition, giving, by the master control MCU, a control instruction to a corresponding slave control MCU according to the pre-set condition, wherein both the sensor signals and the control instruction are transmitted between the master control MCU and the slave control MCUs via the signal transfer panel in an SP signal manner. Also disclosed is a system for interacting master and slave information in real time. The method for interacting master and slave information in real time can reduce the redundant information interaction and improve the communication efficiency.
摘要:
An input/output device inputting and outputting information to an external device includes a control section for communicating with an external controller. Electric equipment for communicating with the input/output device includes an input/output assignment storing section for storing which port of an input circuit an input from the external device is assigned to, and which port of an output circuit an output is assigned to. The electric equipment also includes an electric-equipment-side input/output control section for operating a function of the electric equipment based on information from the control section, or transmitting, to the control section, the information indicating which port of the output circuit an output of the electric equipment is output to. The electric equipment, using the external controller, stores the information related to the assignment in the input/output assignment storing section, or alters the information related to the assignment stored in the input/output assignment storing section.
摘要:
A method and process control data server system architecture are disclosed for providing process data to a variety of client applications via a plurality of differing data sharing standards. The system architecture incorporates a ready platform for subsequently added client application data exchange protocols. In an exemplary embodiment, a set of standard interface definitions between client application data exchange protocol-specific plugins and a data access server engine supports incorporating new client application data exchange protocols by means of plugins designed to interface with the data access server engine according to the standard interface definitions.