Input/output unit for data acquisition with a field-bus system

An input/output unit for data acquisition in a field bus system, comprising:

• a microcontroller that has at least one integrated synchronous serial bus interface and a control device for direct memory access,
• wherein a signal source for a digital signal is connectable to a digital data input master input, slave output (MISO) of a first synchronous serial bus interface of the at least one integrated synchronous serial bus interface,
• wherein the first synchronous serial bus interface reads in the digital signal present at the data input MISO at a first clock rate that corresponds to a data transmission rate of the first synchronous serial bus interface,
• wherein the control device forwards the read-in data words to a buffer memory, and periodically fetches the read-in data words from the buffer memory and forwards the read-in data words to a second synchronous serial bus interface of the at least one integrated synchronous serial bus interface or to another bus interface of the at least one integrated synchronous serial bus interface, and
• wherein the second synchronous serial bus interface or the other bus interface is in communication with a field bus interface, and during data output outputs the data words to the field bus interface at a higher clock rate than the first clock rate during data acquisition by the first synchronous serial bus interface.