Boots – shoes – and leggings
Patent
1996-02-29
1998-06-02
Lee, Thomas C.
Boots, shoes, and leggings
39518211, 364187, G06F 1122
Patent
active
057615187
ABSTRACT:
A method and apparatus for performing an on-line replacement of an industrial process control processor module via loop-by-loop transfer of control blocks is described. After replacing a backup control processor module in a redundant processor configuration with a first upgrade control processor module, the first upgrade control processor module is placed in a partially operable mode enabling reading of control values from a control data storage. However, the partially operable upgrade control processor module cannot write values to the control data storage. Thereafter, control loops for an industrial control process are transferred, one loop at a time, from a primary control processor to the first upgrade control processor. After each loop is transferred, the capabilities of the first upgrade control processor are expanded to include write access to the control data storage associated with the transferred control loop. After all control loops have been transferred, the primary control processor is powered down and replaced by a second upgrade control processor module.
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Boehling Warren A.
Peck, III Stephen Albert
Wheeler Alan Reid
Lee Thomas C.
The Foxboro Company
Ton David
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