what is planned socialist economy ?

"Socialist" and "planned: are two characteristics an economy can have.

A "socialist" economy is the one whose production process is socialist, as in the the resources are owned collectively and production is done only for direct use. Socialism is one of the five production processes,other being,primitive,slavery, feudalism,capitalism.Th profit motive is not the major concern of producers under socialism.

A "planned" economy is the one which carries on its economic and social activities with a plan designed by a central authority generally,the government. There is a significant say of government in deciding the market decisions. 

Any economy possessing characteristics of both socialist and planned economy is called a planned socialist economy.