METHOD AND APPARATUS FOR UTILIZING A SEQUENCE INTERPRETER APPROACH TO CONTROL LOGIC OF A PROGRAMMABLE LOGIC CONTROLLER

摘要

The work memory of a programmable logic controller (PLC), comprising a complete command set to control the process only one instruction at a time from the load memory of the PLC is loaded . Each command , before the corresponding command can be executed , and has a format that includes at least one option code which must be evaluated to be true by the PLC interpreter . When evaluated as an interpreter of the at least one option code is false , the command is not executed , and from the load memory to the work memory, the command is transmitted , the corresponding option code is evaluated .