G - Physics – 05 – B
Patent
G - Physics
05
B
G05B 9/03 (2006.01) G05B 15/02 (2006.01) G05B 19/05 (2006.01) G06F 11/16 (2006.01)
Patent
CA 2139563
A method of input signal resolution in a process control system where each of the actively redundant process control computers per- forms a common arbitration process on corresponding input signals. Blocks of corresponding input signals are mutually exchanged by the actively redundant process control computers, and an initial check is made to determine if these input signals are valid. For input signals re- presenting valid analog values, a determination is made as to whether a predefined tolerance has been exceeded between corresponding input signals in the present process control cycle. When the predefined toler- ance has been exceeded, then a check will be made to determine the predefined tolerance was also exceeded in the last process control cy- cle. If the predefined tolerance was not exceeded in the last process control cycle, then the analog input value selected during the last pro- cess control cycle will be employed in the present process control cycle. If the predefined tolerance was exceeded in both the present and the last process control cycle, then a predetermined magnitude criteria will be used to select the analog input value for use in making process con- trol decisions. An indication will also be provided in each of the active- ly redundant process control computers to identify which of the corre- sponding input signals were selected by that process control computer.
Baca Eloy Jr.
Dupree Wayne Powell
Grinwis Donald J.
Kanse Johannes C.
Pelletier Douglas Peter
Dow Global Technologies Inc.
Smart & Biggar
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