Method for operation of a field device in a matched-power mode

A method for operating a field device of process automation technology, wherein the field device includes a fieldbus communication interface, to which a wireless adapter is connected comprising the steps of:

• supplying the field device with electrical power by the wireless adapter via the fieldbus communication interface;
• and
• an electrical current flows over the fieldbus communication interface, which electrical current is not limited, so that it can freely adjust corresponding to a power requirement.

The method as claimed in claim 12, wherein:

• the field device and the wireless adapter can, alternatively, also be operated in a standard-mode, in which the electrical current flowing over the fieldbus communication interface is set to a predetermined value, especially to a measured value to be transmitted analogly over the fieldbus communication interface according to the HART® standard;
• and
• the setting of the electrical current is preferably implemented through a corresponding electrical current adjusting circuit in the field device.