Transcription of Programmable Logic Controllers - Dr. Jeff Jackson
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Programmable Logic Controllers - Dr. Jeff Jackson
3-1Dr. D. J. Jackson Lecture 3-1 Electrical & Computer EngineeringProgrammable Logic ControllersPLC Addressing and Basic InstructionsDr. D. J. Jackson Lecture 3-2 Electrical & Computer EngineeringBasic addressing For the Allen-Bradley PLCs and the simulator used, the input and output image areas (in addition to other data) are held in data files Each data file holds information such as Discrete input values Discrete output values Values associated with timers Values associated with counters Status information D. J. Jackson Lecture 3-3 Electrical & Computer EngineeringPLC data filesSimulator data filesAB PLC data filesDr. D. J. Jackson Lecture 3-4 Electrical & Computer EngineeringI/O memory mapping Basic AB PLC addressingX1 file typeI inputO outputS statusB binaryT- timerC-counterData file number(can be omitted for thebasic data files)Slot number (not used with the simulator)Word number: selectsa specific word ina data fileBit numberI/O located on the controller (embedded I/O) is slot added to the controller (expansion I/O) begi
3-3 Electrical & Computer Engineering Dr. D. J. Jackson Lecture 3-5 Example Addressing CPU Module (slot 0) Digital Input Module (slot 1) 16 inputs Digital Output Module (slot 2) 8 outputs
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