| 摘要 |
PURPOSE:To enhance the processing capacity by providing a function for monitoring and identifying the initiation signal from the control station in the connunucation control device of the slave station and interrupting the input and output channel device only during the initiation with respect to the self-station. CONSTITUTION:When the slave station receives the initiation signal from the receiving circuit 61, the transmission and receiving control circuit 62 detects the address signal 63 and identifies whether the initiation signal indicates polling or selecting and outputs the polling detection signal 65 or the selecting detection signal 64. The signal 63 is compared with the specified address signal 67 in order to specify whether the specified address is found or not, by the coincidence circuit 66, and only when it coincides therewith, in the input and output channel, the polling or the selecting is selectively interrupted. Thus, the input and output channel can be operated by the control word set previouslly by the program, so that the input and output interrupt number to the program can be decreased, thereby the processing capacity being enhanced. |
