| 摘要 |
PCT No. PCT/JP89/00460 Sec. 371 Date Dec. 29, 1989 Sec. 102(e) Date Dec. 29, 1989 PCT Filed May 1, 1989 PCT Pub. No. WO89/11191 PCT Pub. Date Nov. 16, 1989.When a press or like machine is centrally controlled, many sensors are used for detecting the conditions of various portions of the machine and many actuators are used for controlling the conditions of various portions of the machine. The invention provides a device for detecting the position of broken line in a series controller wherein peripheral processing devices indirectly control the sensors and the actuators, and these peripheral processing devices are connected in series via signal lines in an annular manner via a central processing unit or in a serial manner relative to the central processing unit, such that position of breakage on the signal line can be detected. Therefore, when breakage develops on the signal line and no signal is transmitted to the peripheral processing device directly after the broken line, the peripheral processing device produces a line breakage signal. Upon receiving the line breakage signal from a controller of a preceding stage, the peripheral processing devices in the subsequent stages add the broken line position data of broken line signal one by one successively. Thus, as the line breakage signal is input to the central processing unit, the calculation is carried out in a reversed manner from the added value of broken line position data of line breakage signal that is input, and a position of broken line is detected.
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