For manufacture of the machine portion to mass-produce, we convert a general purpose machine and make an exclusive machine. We are using it combining the automatic machine of varieties, in order to manufacture a machine part efficiently. In order to build these machining things with sufficient accuracy, it becomes important to take the synchronization between automatic machines. In the present paper, one set of an exclusive machine operates with a programmable controller, and one more set of an exclusive machine operates with a microcomputer. Two sets of these exclusive machines exchange signals mutually, and the system by which they can exchange signals mutually and can operate was built. Author report the result.