Programmable controller which allows for removal of the I/O modu

Details Programmable controller which allows for removal of the I/O modu Programmable controller which allows for removal of the I/O modu

1993-03-02

1995-04-18

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

34082522, 34082552, H04Q 100

Patent

active

054082293

ABSTRACT:
A programmable controller that allows input and output modules to be changed during an on-line mode with minimal interaction by the user. The controller includes a request table that separately stores change request signals generated by each module. In a first embodiment, the controller periodically polls this request table to determine whether any module has issued a change request. The controller disables each module that issues a change request. When a new module is loaded, the controller enables this module once the corresponding change request signal is removed from the request table. In a second embodiment, the controller uses an interrupt circuit to interrupt processing when a change request is initiated.

REFERENCES:
patent: 3818199 (1974-06-01), Grossmann et al.
patent: 4638313 (1987-01-01), Sherwood, Jr. et al.
patent: 4674085 (1987-06-01), Aranguren et al.
patent: 4727475 (1988-02-01), Kiremidjian
patent: 4730251 (1988-03-01), Aokie et al.
patent: 5204669 (1993-04-01), Dorfe et al.
IBM Technical Disclosure Bulletin, vol. 29, No. 7, Dec. 1986, New York, U.S.A., pp. 2877-2878, "Circuits To Allow Cartridge Hot-Plugging".

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