Method and apparatus for exchanging multiple data bytes with an

Details Method and apparatus for exchanging multiple data bytes with an Method and apparatus for exchanging multiple data bytes with an

1984-11-16

1987-09-01

Williams, Jr., Archie E.

Boots, shoes, and leggings

G05B 1101

Patent

active

046912967

ABSTRACT:
In a programmable controller, addresses for a group of input/output modules are decoded to generate an enable signal to each respective module. To increase the density of I/O circuits per module without increasing the width of the data bus, the I/O modules are provided with enabling circuits that are responsive to a pair of associated enabling signals in one method of I/O scanning and responsive to an enabling signal and two or more byte addresses received in another method of I/O scanning. Circuit paths have been added on a backplane circuit board to allow each enable signal to be coupled to a pair of I/O modules in the first method of I/O scanning. In the second method of I/O scanning, the hardware for carrying out the first method is disabled and byte addresses are used to couple multiple bytes of I/O status to each I/O module.

REFERENCES:
patent: 4250563 (1981-02-01), Struger
patent: 4413319 (1983-11-01), Schultz et al.
patent: 4473877 (1974-09-01), Tulk

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