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Logix5000 Controllers General Instructions - SLAC Confluence

Logix5000 Controllers General Instructions - SLAC Confluence

Logix5000 Controllers General Instructions - SLAC Confluence

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572 ASCII Serial Port <strong>Instructions</strong> (ABL, ACB, ACL, AHL, ARD, ARL, AWA, AWT)Instruction ExecutionASCII serial port instructions execute asynchronous to the scan ofthe logic:LogicRung-condition-in ofinstruction transitionsfrom false to trueInstruction enters theASCII queue.Serial PortASCII QueueInstruction 1Instruction 2Instruction 3Instruction 4Data flows betweenbuffer and serial port.ASCII TaskInstruction at the topof the queue executes.Data flowsbetween task andbuffer.BufferEach ASCII serial port instruction (except ACL) uses aSERIAL_PORT_CONTROL structure to perform the followingfunctions:• control the execution of the instruction• provide status information about the instructionPublication 1756-RM003I-EN-P - January 2007

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