ON-LINE DEBUGGING DEVICE FOR PROGRAMMABLE CONTROLLER

摘要

PURPOSE:To perform a debugging operation in an on-line mode without affecting the real operation of an on-line debugging device by debugging one of both programmable controllers having the same application programs while keeping the other controller in an on-line mode respectively. CONSTITUTION:An on-line programmable controller PC 1 and a debug PC 2 are connected to a process line 6 connected to an input device 4 and an output device 5 via a bus line. In a system of such a constitution, the difference of output value is detected by an output difference detecting part 9b between the PC 1 and 2 with the PC 1 kept in an on-line state when the PC 2 is debugged. Then the output value of the device 4 is corrected by an input correction part 9a in accordance with the detection value of the part 9b. This corrected output value is inputted to the PC 2 under debugging.