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We are setting up a machine and need to fill dbs from a database, mostly with metric values which are basis for axis calculations. the sps requests the set of values (recipe) from a database and then puts them in a db. as everywhere, many paths lead to rome, so some of the single values may contain a NIL value (there's nothing in it, not zero/0). as far as the database mgnt sys is concerned, almost every one of those can handle this. but can the s7 db handle this concept? reson is: we do not want to make such special assumptions like: temperature shall be "value" unless "value" is not zero. if "value" is zero temp. conditioning is bypassed. any suggestions out there? thanx in advance thomas