Circuit for coupling a field bus and a local bus

A method for operating a circuit for coupling a field bus and a local bus, the method comprising:

• transmitting a data packet with process data cyclically on the local bus by a local bus controller of the circuit in a cycle frame;
• receiving the process data, transmitted with the data packet, beforehand in a field bus message by a field bus controller of the circuit;
• transferring the process data from the field bus controller to the local bus controller via a data management unit;
• copying the process data into a memory area by the data management unit;
• storing the process data in the memory area;
• and
• reading out the process data, stored in the memory area, by a processor asynchronously with respect to the cycle frame.

A method for operating a circuit for coupling a field bus and a local bus, the method comprising:

• receiving cyclically a data packet with process data, based on a cycle frame, on the local bus by a local bus controller of the circuit;
• transmitting the process data, received with the data packet, in a field bus message by a field bus controller of the circuit;
• transferring the process data from the local bus controller to the field bus controller via a data management unit;
• copying the process data into a memory area by the data management unit and storing the process data in the memory area;
• and
• reading out the process data stored in the memory area by a processor asynchronously with respect to the cycle frame.