Industrial controller with variable I/O update rate

Details Industrial controller with variable I/O update rate Industrial controller with variable I/O update rate

1989-07-17

1992-03-24

Lee, Thomas C.

Boots, shoes, and leggings

364949, 3649493, 3649494, 36494991, 3649416, 3649411, 3649413, 364DIG2, G06F 1546

Patent

active

050994492

ABSTRACT:
An industrial controller has an I/O scanner that may scan I/O modules at differing rates depending on the intrinsic bandwidth of the controlled process variable. The user defines an update rate for each I/O module reflecting the bandwidth of its associated variable. The scanner continuously updates a table of I/O events for each I/O module or I/O rack listing permissive and mandatory I/O execution times associated with each event. Using this event table, the I/O scanner determines the next I/O module to be serviced. If the event cannot be serviced on schedule, indication of an event slip is reported to the controller.

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patent: 4807108 (1989-02-01), Ben-Arieh et al.
patent: 4876664 (1989-10-01), Bittorf et al.
patent: 4937777 (1990-06-01), Flood et al.
patent: 4956784 (1990-09-01), Hadavi et al.

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