A display apparatus (101) includes an input unit (220); a communication unit (250); a display unit (210); and a control unit (240) including a display content setting unit (244), a layout setting unit (245) for setting a screen layout, and a screen generation unit (246) for generating a display screen based on the display content, the screen layout, and information acquired via the communication unit (250) and concerning the PLC. The display content setting unit (244) displays a candidate list of a display item based on at least one of: network configuration information (231) of equipments (103) and a PLC (102) which is created in advance, an equipment information file (232), and device allocation information (233) of the equipments (103) and the PLC (102), to the display unit, and sets display content based on input information coming from the input unit (220). The display apparatus can thus generate a display screen for an FA system based on information shared with another apparatus, as information concerning an equipment which is information other than screen configuration information.

A display apparatus (101) includes an input unit (220); a communication unit (250); a display unit (210); and a control unit (240) including a display content setting unit (244), a layout setting unit (245) for setting a screen layout, and a screen generation unit (246) for generating a display screen based on the display content, the screen layout, and information acquired via the communication unit (250) and concerning the PLC. The display content setting unit (244) displays a candidate list of a display item based on at least one of: network configuration information (231) of equipments (103) and a PLC (102) which is created in advance, an equipment information file (232), and device allocation information (233) of the equipments (103) and the PLC (102), to the display unit, and sets display content based on input information coming from the input unit (220). The display apparatus can thus generate a display screen for an FA system based on information shared with another apparatus, as information concerning an equipment which is information other than screen configuration information.

A system and a method for safety relevant input to a control system, the control system including a PLC which includes a non-safety control module for controlling non-safety processes, and a safety control module for controlling functional safety of processes, the system further including an operator panel for user selection of safety-related object input, wherein the system includes two communication paths between the operator panel and the safety control module, that each of the communication paths uses a different communication protocol, that each communication path goes through the non-safety control module to and from the safety control module, that the first communication path transfers object code and the second communication path transfers masked object code.

A system and a method for safety relevant input to a control system, the control system including a PLC which includes a non-safety control module for controlling non-safety processes, and a safety control module for controlling functional safety of processes, the system further including an operator panel for user selection of safety-related object input, wherein the system includes two communication paths between the operator panel and the safety control module, that each of the communication paths uses a different communication protocol, that each communication path goes through the non-safety control module to and from the safety control module, that the first communication path transfers object code and the second communication path transfers masked object code.