Real time monitoring of remote signals in an industrial environm

Details Real time monitoring of remote signals in an industrial environm Real time monitoring of remote signals in an industrial environm

1989-02-16

1991-02-26

Lall, Parshotam S.

Boots, shoes, and leggings

340679, 34087028, 364146, G05B 2300

Patent

active

049966553

ABSTRACT:
A signal timing analyzer monitors a programmable logic control (PLC) of an industrial machine. Signal states of the PLC are sampled and the signal information is then transferred to a receiver card which is connected to a computer data bus. This allows the computer to monitor a piece of equipment by "eavesdropping" on the industrial controller that is actually operating and monitoring the equipment. The analyzer uses an on-board clock and timing circuit, so that the computer is not limited by the computer's clock speed in controlling sampling rates.

REFERENCES:
patent: 3638191 (1972-01-01), Mann
patent: 3858181 (1974-12-01), Goldsby et al.
patent: 4404625 (1983-09-01), Saito et al.
patent: 4642782 (1987-02-01), Kemper et al.
patent: 4866436 (1989-09-01), Kordts et al.
IBM-Personal Computer Hardware reference Library, pp. 2-9 to 2-12.

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