| 摘要 |
PURPOSE:To allow the device to take countermeasures against chattering only through the setting of a dead time of a computer by recognizing and deciding it to be chattering when an input of consecutive 1s takes place in excess of a prescribed dead time after the input changes from '0' to '1'. CONSTITUTION:A fetch means 4 in a state monitor installation control computer 3 being a host device to a manufacture installation 2 fetches digital signals on plural channels from a digital signal detection notice device 1 of the installation 2. Then the device 1 compares the signals with digital signals fetched precedingly. As a result, the signal changes from '0' to '1' deciding means 5 discriminates the state to be a chattering based on a dead time of a channel dependent dead time file 7 registered in advance by a dead time setting means 6 and the state decision as to whether or not the current time is in a dead time. A notice means 8 informs the result of decision of the digital value of each channel to a state monitor control means 9. Thus, only the control computer located to be a host device of various manufacture installations 2 copes flexibly with the state change such as introduction of a new installation or a signal change. |
