Method for data communication between fieldbus devices and a control desk of an automation system, and automation system

A method for data communication between fieldbus devices and a control desk of an automation system,

• wherein the automation system comprises a first fieldbus device, a second fieldbus device, a control unit, connected via a fieldbus system to the first fieldbus device and the second fieldbus device, for controlling the first fieldbus device and the second fieldbus device, and a control desk connected to the control unit by a data bus,
• wherein the control unit comprises a data communication unit for data communication between the first fieldbus device, the second fieldbus device and the control desk by way of the exchange of data communication objects,
• wherein the data communication unit has a first data communication interface, connected to the control desk, for transmitting and receiving data communication objects on the basis of an Open Platform Communication Unified Architecture (OPC UA) protocol standard, a second data communication interface, connected to the first fieldbus device and the second fieldbus device, for transmitting and receiving data communication objects on the basis of a fieldbus protocol and a mapping unit, connected to the first data communication interface and the second data communication interface, for mapping data communication objects on the basis of the OPC UA protocol standard and data communication objects on the basis of the fieldbus protocol on one another,
• wherein the mapping unit is configured to map first data communication objects on the basis of the OPC UA protocol standard and first data communication objects on the basis of the fieldbus protocol on one another according to a first mapping specification, and to map second data communication objects on the basis of the OPC UA protocol standard and second data communication objects on the basis of the fieldbus protocol on one another according to a second mapping specification,
• wherein the first mapping specification defines a mapping of the first data communication objects on the basis of the OPC UA protocol standard and the first data communication objects on the basis of the fieldbus protocol on one another,
• wherein the second mapping specification defines a mapping of the second data communication objects on the basis of the OPC UA protocol standard and the second data communication objects on the basis of the fieldbus protocol on one another,
• wherein in the first mapping specification, the first data communication objects on the basis of the OPC UA protocol standard and the first data communication objects on the basis of the fieldbus protocol to be used in the data communication between the control desk and the first field device are defined, and
• wherein in the second mapping specification the second data communication objects on the basis of the OPC UA protocol standard and the second data communication objects on the basis of the fieldbus protocol to be used in the data communication between the control desk and the second field device are defined, wherein the fieldbus protocol used in the data communications with the second fieldbus device is the fieldbus protocol used in the data communications with the first fieldbus device, the method comprising:
• transmitting, by the control desk, first data communication objects on the basis of the OPC UA protocol standard to the first fieldbus device and/or transmitting, by the control desk, second data communication objects on the basis of the OPC UA protocol standard to the second fieldbus device in a first transmission step;
• receiving the first data communication objects on the basis of the OPC UA protocol standard and/or receiving the second data communication objects on the basis of the OPC UA protocol standard by the first data communication interface in a first reception step;
• mapping the first data communication objects on the basis of the OPC UA protocol standard, received by way of the first data communication interface, on first data communication objects on the basis of the fieldbus protocol according to the first mapping specification by the mapping unit and/or mapping the second data communication objects on the basis of the OPC UA protocol standard, received by way of the first data communication interface, on second data communication objects on the basis of the fieldbus protocol according to the second mapping specification by the mapping unit in a first mapping step;
• transmitting, by the second data communication interface, the first data communication objects on the basis of the fieldbus protocol to the first fieldbus device and/or transmitting, by the second data communication interface, the second data communication objects on the basis of the fieldbus protocol to the second fieldbus device in a second transmission step;
• and
• receiving the first data communication objects on the basis of the fieldbus protocol by the first fieldbus device and/or receiving the second data communication objects on the basis of the fieldbus protocol by the second fieldbus device in a second reception step.