A procedure and an arrangement to, with a temporary permit code/entry code number, give a visiting person (B) admittance to an installation/plant (1) equipped with code lock (2), at which a permit code server (3) generates a permit code and parallelly distributes the generated permit code to the visiting person (B) and to the code lock (2) of the installation/plant (1). At that is the code lock (2) arranged to give admittance to the installation/plant (1) at entering of said permit code. When the permit code server (3) distributes the permit code to the code lock (2), it preferably also transmits validity information to the code lock (2) regarding the validity of the distributed permit code. Such validity information can refer to for how long time the distributed permit code shall be valid, or the number of enterings in the code lock (2) the distributed permit code shall be valid for.
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