| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a programmable controller which eliminates the influence of a loading capacity caused by the increase and the decrease of a module connected to a system bus by setting up a buffer circuit in the immediate vicinity of a connector connected to each module on the system bus. <P>SOLUTION: The programmable controller is provided with a plurality of connectors to which individual modules are connected and arranged in alignment; and a clock driving circuit which distributes a clock signal to each of the plurality of connectors through a system bus. The programmable controller is constituted to have a pull-up means which carries out the pull-up of a clock signal to each of the plurality of connectors, namely, a buffer circuit is arranged in the immediate vicinity of each connector and timing signals are supplied to each of the plurality of connectors after passing the buffer circuit. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
