ACCESS CONTROL SYSTEM FOR CONTROLLER

摘要

PURPOSE:To facilitate simulation by improving the CPU execution speed of a controller and executing a tracing function which is necessary for maintenance without placing a load on a CPU. CONSTITUTION:An image memory 6 is arranged between input/output cards 3 and 4 and the CPU 1 and refreshed only at the time of input/output variation. Further, the image memory 6 is constituted so as to have a 1st memory 6a and a 2nd memory 6b and data simultaneousness is secured.