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PowerPoint ® Presentation Chapter 3 Electrical Circuits and PLCs Electrical Symbols and Diagrams Standard Electrical Symbols PLC Programming Symbols Pictorial Drawings Wiring Diagrams Line (Ladder) Diagrams Logic Functions AND Circuit Logic OR Circuit Logic NOT Circuit Logic NOR Circuit Logic NAND Circuit Logic Electrical Wiring Methods Direct Hardwiring Hardwiring Using Terminal Strips PLC Wiring

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Chapter 3 Electrical Circuits and PLCs Switch symbols are drawn to provide a visual indication of how each switch operates in a circuit.

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Chapter 3 Electrical Circuits and PLCs Any normally open (NO) switch that is manually operated has the operator of the switch drawn above the terminals, and any normally closed (NC) switch that is manually operated has the operator of the switch drawn below the terminals.

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Chapter 3 Electrical Circuits and PLCs Electrical switches are drawn in normal condition or activated condition on electrical prints.

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Chapter 3 Electrical Circuits and PLCs Switches are drawn on prints in the operating condition the switch is most likely to be in at any point in time.

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Chapter 3 Electrical Circuits and PLCs Not understanding how manual, mechanical, and automatic switch symbols are drawn makes circuit understanding and troubleshooting difficult.

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Chapter 3 Electrical Circuits and PLCs Solid-state switches start and stop the flow of electricity in a circuit without the use of moving parts. Solid-state switch symbols show the actual switch symbol in a diamond shape.

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Chapter 3 Electrical Circuits and PLCs Programming symbols for input devices are drawn as generic normally open or normally closed contacts, and all output components are drawn as parentheses.

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Chapter 3 Electrical Circuits and PLCs Special symbols are used in PLC programming when a PLC has advance control functions.

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Chapter 3 Electrical Circuits and PLCs Pictorial drawings are used to provide a visual picture of devices, components, and wiring.

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Chapter 3 Electrical Circuits and PLCs Wiring diagrams show the connection of all devices and components to a PLC.

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Chapter 3 Electrical Circuits and PLCs Thermocouples are connected to analog PLC input terminals because thermocouples produce a voltage proportional to the measured temperature.

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Chapter 3 Electrical Circuits and PLCs Line diagrams use standard electrical symbols to indicate what types of input devices and output components are being used in a circuit.

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Chapter 3 Electrical Circuits and PLCs Standard line diagrams and PLC programming diagrams are similar, although different symbols are used to represent the same device or component.

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Chapter 3 Electrical Circuits and PLCs All electrical control circuits that use any type of switches to control loads are comprised of switching logic functions.

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Chapter 3 Electrical Circuits and PLCs All input devices of an AND logic circuit must be activated in order to energize the output component.

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Chapter 3 Electrical Circuits and PLCs Only one input of an OR logic circuit is activated in order to energize the output component.

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Chapter 3 Electrical Circuits and PLCs The input of a NOT logic circuit must be deactivated in order to energize the output component.

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Chapter 3 Electrical Circuits and PLCs Only one input of a NOR logic circuit must be deactivated in order to energize the output component.

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Chapter 3 Electrical Circuits and PLCs All input devices of a NAND logic circuit must be deactivated in order to energize the output component.

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Chapter 3 Electrical Circuits and PLCs In direct hardwired circuits, the power circuit and control circuit are wired point-to-point.

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Chapter 3 Electrical Circuits and PLCs To add forward rotation indicator lamps and reverse rotation indicator lamps to a direct hardwired circuit is difficult because the exact connection points for the lamps must be found.

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Chapter 3 Electrical Circuits and PLCs To make modifications to direct hardwired circuits typically requires the removal and/or addition of circuit wiring.

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Chapter 3 Electrical Circuits and PLCs Hardwiring using terminal strips dramatically simplifies circuit troubleshooting.

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Chapter 3 Electrical Circuits and PLCs Modifications are easier with terminal strips because most, if not all, of the wires required to make a change are disconnected and reconnected at the terminal strip.

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Chapter 3 Electrical Circuits and PLCs When using a PLC to control a circuit, all input devices are wired to the input module of the PLC, and all output components are wired to the output module of the PLC.

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