Programmable controller capable of updating a user program durin

Details Programmable controller capable of updating a user program durin Programmable controller capable of updating a user program durin

1994-04-22

1997-02-04

Harrell, Robert B.

G06F 9445

Patent

active

056008074

ABSTRACT:
A programmable controller, including at least a sequence processor, has plural memories for storing user programs which can be accessed by the same addresses from the sequence processor. The memories are selectively enabled in response to a mode signal and an access signal from the sequence processor. In this way, switching between memories enables the sequence processor to switch its processing from one user program to another without the need to transfer the user programs from one memory to another. Where an additional control processor is included in the programmable controller for updating user programs, it is possible to enable access by the sequence processor to one memory and the control processor to another memory during the same instruction cycle.

REFERENCES:
patent: 4257097 (1981-03-01), Moran
patent: 5012408 (1991-04-01), Conroy
patent: 5144242 (1992-09-01), Zeilenga et al.

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