Special function control system for a dual microprocessor programmable process control system
US4215399A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 24, 1978 |
| Grant date | Jul 29, 1980 |
| Priority date | — |
| Expiry date | Aug 24, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05B2219/15127
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
An intelligent programmable process control system including a first microprocessor which scans and executes a sequence of boolean logic functions and a second microprocessor which performs complex operations including arithmetic computations beyond the capabilities of the first microprocessor. The first microprocessor transmits interrupt requests to the second microprocessor when a scanned sequence instruction requires complex operations to be performed. First flag bit register indicates to the first microprocessor that a requested operation has been queued-up. Second flag bit register indicates to the first microprocessor that the requested operation has been completed. When the first microprocessor requires complex operations, it checks the state of a respective first flag bit register to determine whether the complex operation has already been queued-up and if so, checks the state of a respective second flag bit register to determine whether the queued-up function has been completed by the second microprocessor. If the complex operation has been queued-up and the second flag bit indicates that the operation has not been completed, the first microprocessor continues scanning and…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.