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AssigneeAllen-Bradley Company, Inc.
InventorsOtomar Schmidt, Richard S. Gunsaulus, Ronald E. Schultz, Charles M. Rischar, Jeffrey W. Brooks
Estimating the term…
A co-processor interface allows both a general processor and a relay ladder processor to make repeated calls to each other in the execution of subroutines. A register transfer instruction detected by the relay ladder processor triggers a suspension of the general processor. Return of control to the general processor is accomplished at the same time a register value is provided to the general processor that the general processor uses to reinitialize its program counter. For most single level transfers of control, a single transition instruction between the general processor to the relay ladder processor is sufficient to perform a call.
An industrial controller for executing a user program having relay ladder control instructions and general computer instructions, the controller comprising:
The industrial controller as recited in claim one wherein the general processor responds to the second transition instruction also by saving a value of the first program counter prior to transferring a new value to the first program counter.
An industrial controller for executing a user program having relay ladder control instructions and general computer instructions, the controller comprising:
Dependencies are inferred from the claim text.