System for monitoring the operation of input circuits to a centr

Details System for monitoring the operation of input circuits to a centr System for monitoring the operation of input circuits to a centr

1983-12-28

1986-09-16

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Signal isolator

340514, G08B 2900

Patent

active

046124454

ABSTRACT:
A system for controlling and monitoring a manufacturing or packaging line. The system includes a plurality of input circuits of identical configuration, each being able to provide either: (a) an integrator for eliminating disturbing signals fed to the input circuit, (b) a high pass filter for passing AC signals to the input circuit, or (c) a rectifier for rectifying AC signals fed to the input circuit. Each of the circuit configurations includes a plurality of terminals arranged for connection to devices for controlling or monitoring the manufacturing or packaging line. The connections between the terminals and the devices are selected in accordance with the type of device employed. The system also includes a central control unit connected to the input circuits and a detection circuit connected to the input circuits to detect defects in the operation of the input circuit. The detection circuit also includes a system for sending test signals to the input circuits, wherein the test signals are operable to cause changes in the logic level of the signals sent by the output circuits to the central unit. The detection circuit also includes a system for detecting the changes of the logic level and discriminating whether or not the changes are the consequence of sending the test signals.

REFERENCES:
patent: 4068105 (1978-01-01), Jain et al.
patent: 4275307 (1981-06-01), Struger et al.
patent: 4415884 (1983-11-01), Delin et al.
patent: 4464605 (1984-08-01), Ford, Jr. et al.

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