Programmable Logic Controllers - Electrical and Computer ...

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11-1Dr. D. J. Jackson Lecture 11-1Electrical & Computer EngineeringProgrammable Logic ControllersPLC I/O Module Types and PLC Trainer ConfigurationDr. D. J. Jackson Lecture 11-2Electrical & Computer EngineeringBasic Module Types Digital (discrete) output modules Optical isolation provided Relay, transistor or triac based Transistor-based outputs may be Current sourcing or Current sinking Digital (discrete) input modules Optical isolation provided Diode based Current sinking, sourcing or both depending on device11-2Dr. D. J. Jackson Lecture 11-3Electrical & Computer EngineeringRelay Output ModuleCPUPowerActuator+/--/+common076OUT 6Dr. D. J. Jackson Lecture 11-4Electrical & Computer EngineeringRelay Output Module Coil actuated switch closing AC or DC switching Relay determines current carrying capacity More expensive relay I/O modules may have two external contacts per relay Separate actuator and power supply can be connected to each relay-controlled circuit Most flexible in terms of power types (AC or DC) and connections Less expensive relay I/O module Common contact for a group (or all) outputs11-3Dr.

11-1 Electrical & Computer Engineering Dr. D. J. Jackson Lecture 11-1 Programmable Logic Controllers PLC I/O Module Types and PLC Trainer Configuration Electrical & Computer Engineering Dr. D. J. Jackson Lecture 11-2 Basic Module Types

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