The controller of tool broken detection device was configured by PROFIBUS. Siemens 840D sl system standard magazine interface was redeveloped to implement tool broken detection setting, the data exchange between NC and PLC was realized through NC tool exchange subprogram and PLC program.Then tool messages like length, whether tools needed to be detected or not, were transmitted to PLC.Actions of detection device were controlled by PLC, and whether tools were broken or not was determined through comparison with the actual messages.The device has been actually used in the production to reduce reject rate caused by tool breaking, thereby the costs are reduced and the efficiency is improved.