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I think you are refering to "Vorgangspassiv" and "Zustandspassiv".

In German, you can form the passive voice with "sein" (to be) as well as "werden" (to become). What that does is change the meaning from a real passive meaning to "expressing a state of being":

Das Fahrrad wird abgeschlossen (the bike is (currently) being locked (by someone))

Das Fahrrad wurde abgeschlossen (the bike was being locked)

Das Fahrrad ist abgeschlossen (the bike is locked)

Das Fahrrad war abgeschlossen (the bike was locked)


Think about "werden" in this context as "to become [state]". Das Fahrrad wird abgeschlossen literally means "the bike is becoming a locked bike", while "sein" simply means "is locked".

Sometimes the meaning of a sentence can change depending on which passive you use:

Er wird geschlagen (He's being beaten/hit)
Er ist geschlagen (he lost/he's defeated)

Also note that you can't add the person acting when you use "sein" (Zustandspassiv), which is possible when using the "normal" passive voice with "werden":

Das Fahrrad ist VON IHM abgeschlossen (wrong!) (Zustandspassiv)
Das Fahrrad wurde von ihm abgeschlossen (correct, "was locked by him") (Vorgangspassiv)

The perfect tense of "Vorgangspassiv" looks pretty similar to "Zustandspassiv", so keep that in mind:

Das Fahrrad ist von ihm abgeschlossen worden (Vorgangspassiv Perfekt Indikativ) (the bike has been locked by him)