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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 executing its sequence of functions asynchronously with respect to the second microprocessor. If the first flag bit indicates that the operation has not been queued-up, then the first microprocessor transmits an interrupt request to the second microprocessor.

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First Claim