Synchronized programmable controller and method of controlling t

Details Synchronized programmable controller and method of controlling t Synchronized programmable controller and method of controlling t

1993-11-01

1995-02-14

Ruggiero, Joseph

Boots, shoes, and leggings

364187, 364DIG1, 364230, 36424292, 3642712, 364DIG2, 3649269, 36493148, 364949, 371 91, 371 683, 395550, 395575, G06F 1546, G06F 1314

Patent

active

053901037

ABSTRACT:
A programmable controller for controlling line assembly machines includes first and second CPUs for cyclic execution of a user program stored in user memories. Execution cycles of one of the two CPUs are synchronized to those of the other by means of a synchronization signal such that simultaneous accesses to the input/output bus do not take place. After booting, the second CPU is synchronized to the first. When the two CPUs enter into execution cycles of the user program, an abnormally functioning CPU is temporarily halted, and thereafter the execution cycles of such CPU is synchronized to those of the normally functioning CPU.

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patent: 4975838 (1990-12-01), Mizuno et al.
patent: 5010476 (1991-04-01), Davis
patent: 5142470 (1992-08-01), Bristow et al.

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