Field device for automation systems

Disclosed is a field device for automation systems with means for internal data organization, means for detecting process variables and / or means for outputting manipulated variables, means for signal processing, depending on the detected or dispensed manipulated variables, and at least one communication interface. The means and the communication interface to communicate with a device for internal data organization for the exchange of data between each other. To control access by the media and by the at least one communication interface to the data of the device for internal data organization between the means and the at least one communication interface and the device for internal data organization, a transaction manager device is provided that locks, transactions and / or users managed.