An IO-Link master includes: an IO-Link communication port that communicates with an IO-Link device according to a predetermined communication protocol; a digital input port that receives a first signal value output from the IO-Link device; and a determiner that determines whether abnormality is generated in a digital input line connecting the digital input port to the IO-Link device based on a second signal value received with the IO-Link communication port and the first signal value.

The PLC communication system associated with the invention is characterized in that the system comprises a programmable logic controller (PLC), a plurality of processing devices, at least three communication processing nodes provided at the PLC and at the plurality of processing devices respectively to establish communication of the PLC and each of the processing devices and an interconnecting device and a plurality of communication lines for connecting the communication processing nodes with one another to establish data communication among the communication processing nodes. The PLC detects a state of communication failure and a display device displays an abnormal portion in a communication route based on the number of occurrences of the state of communication failure in respective interconnecting device and plurality of communication lines.

A telecommunications system for a programmable logic controller (PLC) includes: a master module comprising a transmitter and a receiver; one or more slave modules configured to receive signals transmitted from the transmitter and transmit signals to the receiver in response to the transmitted signals; a signal conversion module configured to convert the signals transmitted between the master module and the slave modules into digital signals; a control module configured to control the signal conversion module and to determine whether there is an error in the signals transmitted between the master module and the slave modules based on the digital signals; a display module configured to display a result of the determination by the control module.

A control system includes a controller, a transmission unit, an application executing unit, and a management unit. The controller executes a control program controlling a control target, and manages pieces of process data referred to or updated in the control program. The transmission unit transmits data sets including values of the pieces of process data managed by the controller, each of the data sets including one or more process data values. The application execution unit executes one or more applications using the value of the process data included in the data set transmitted by the transmission unit. The management unit determines a data set validating transmission in the data sets transmittable by the transmission unit according to the application executed by the application execution unit.

The disclosure provides, inter alia, a method performed by a wireless receiving node for receiving a data stream from one or more wireless transmitting nodes, the data stream comprising a sequence of data items. The method comprising: receiving an indication of an algorithm from a wireless transmitting node of the one or more wireless transmitting nodes; receiving a plurality of data packets from the one or more wireless transmitting nodes, each data packet comprising respective duplicate copies of data items belonging to the data stream; and utilizing the algorithm to select, based on respective times at which the data packets are received, for each position in the sequence, one or more of the duplicate copies of data items for reconstruction of the data stream.

A network management device that supports restoration from an abnormality is provided. A management device is a management device that manages a network including a master device and a slave device connected to the master device, and includes a network configuration diagram display unit that displays a network configuration diagram based on design information of a network according to a design created by a user, a state information acquisition unit that acquires state information relating to a state of the slave device, and a state display unit that displays the state on the network configuration diagram in association with the slave device based on the state information.

The disclosure provides, inter alia, a method performed by a wireless receiving node for receiving a data stream from one or more wireless transmitting nodes, the data stream comprising a sequence of data items. The method comprising: receiving an indication of an algorithm from a wireless transmitting node of the one or more wireless transmitting nodes; receiving a plurality of data packets from the one or more wireless transmitting nodes, each data packet comprising respective duplicate copies of data items belonging to the data stream; and utilizing the algorithm to select, based on respective times at which the data packets are received, for each position in the sequence, one or more of the duplicate copies of data items for reconstruction of the data stream.

An IO-Link master includes: an IO-Link communication port that communicates with an IO-Link device according to a predetermined communication protocol; a digital input port that receives a first signal value output from the IO-Link device; and a determiner that determines whether abnormality is generated in a digital input line connecting the digital input port to the IO-Link device based on a second signal value received with the IO-Link communication port and the first signal value.

A telecommunications system for a programmable logic controller (PLC) includes: a master module comprising a transmitter and a receiver; one or more slave modules configured to receive signals transmitted from the transmitter and transmit signals to the receiver in response to the transmitted signals; a signal conversion module configured to convert the signals transmitted between the master module and the slave modules into digital signals; a control module configured to control the signal conversion module and to determine whether there is an error in the signals transmitted between the master module and the slave modules based on the digital signals; a display module configured to display a result of the determination by the control module.

A control system includes a controller, a transmission unit, an application executing unit, and a management unit. The controller executes a control program controlling a control target, and manages pieces of process data referred to or updated in the control program. The transmission unit transmits data sets including values of the pieces of process data managed by the controller, each of the data sets including one or more process data values. The application execution unit executes one or more applications using the value of the process data included in the data set transmitted by the transmission unit. The management unit determines a data set validating transmission in the data sets transmittable by the transmission unit according to the application executed by the application execution unit.