Method for start-up of a field device, wherein for start-up of the field device an energy storage unit (R) for storing electrical energy is charged by means of a power supply (PS), preferably a power-limited power supply (PS), and wherein the electrical energy stored in the energy storage unit (R) is used to supply the field device at least at times with electrical energy, at least during start-up of the field device.

Described is a method for verifying the functional integrity of a safety controller that provides safety functions for one or more machines and has a central evaluation and control unit for operating the safety controller. The method comprises: powering on the safety controller; verifying a stored machine-readable instruction as to whether a commissioning test is to be executed; if verified, displaying information indicating that the commissioning test is to be executed; initiating a verification routine executable by the safety controller, the evaluation and control unit automatically verifying via the verification routine whether a user has successfully verified each of the safety functions; if all of the safety functions are successfully verified, deleting the machine-readable instruction that the commissioning test is to be executed; and if not all of the safety functions are successfully verified, storing the machine-readable instruction, indicating that the commissioning test is to be executed anew.