公开(公告)号：US4095094A

公开(公告)日：1978-06-13

申请号：US779916

申请日：1977-03-21

Applicant: Odo J. Struger ,  William W. Searcy ,  Ernest F. John

Inventor： Odo J. Struger ,  William W. Searcy ,  Ernest F. John

IPC: G05B19/05 ,  G05B23/02 ,  G06F11/10 ,  G06F11/277 ,  G06F11/30 ,  G06F1/00 ,  G05B11/00

CPC classification number: G06F11/277 ,  G05B19/058 ,  G06F11/10 ,  G05B2219/1181 ,  G05B2219/13142 ,  G05B2219/14057 ,  G05B2219/14074 ,  G05B2219/14086

Abstract: A programmable controller includes a hardwired monitor module which connects to the I/O address decoder and the central logic unit of the controller. The monitor module detects malfunctions which cause deviations in the operation of these elements from a prescribed pattern, and in response generates a disabling signal which deenergizes all operating devices on the controlled system. A diagnostic module is also included and is comprised of a set of routines stored in the controller memory which periodically direct the controller to operate according to a prescribed pattern and to indicate deviations from that pattern as a malfunction. Such malfunctions are indicated in a diagnostic register which connects to the monitor module.