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PLC Hardware Components - Coggle Diagram
PLC Hardware Components
PLC Input and Output Modules
Function of Input Interface Module
Receives data from field devices.
Converts signals to a format readable by the PLC processor.
Example: Sensors, switches.
Function of Output Interface Module
Sends data from the processor to control devices.
Converts PLC signals to field device-readable formats.
PLC Rack and Remote Racks
What is a Remote Rack?
A remote rack houses I/O modules not physically located with the main PLC processor.
Connected via communication networks.
Why Are Remote Racks Used?
Reduces wiring complexity.
Enables distributed control systems.
Addressing in PLC Systems
Rack/Slot-based Addressing
Devices are assigned to specific racks and slots in a PLC system.
Simplifies device management and tracking.
Bit Level vs Word Level Addressing
Bit-level addressing uses individual bits for input/output.
Word-level addressing uses multiple bits as a single group (word).
PLC Module Design and Functions
Why Use Plug-in Wiring Terminal Strips?
Allows for easy connection and disconnection.
Reduces installation and maintenance time.
Advantages and Disadvantages of High-Density Modules
Advantages: More I/O in less space, cost-effective.
Disadvantages: Higher complexity, potential heat issues.
PC-Based Control Systems
Field Device Interface
PC-based systems interface through I/O modules.
Utilizes software to map inputs and outputs.
I/O Modules with Inputs and Outputs
Some I/O modules can manage both types simultaneously.
Simplifies wiring and integration.
PLC Output Module Characteristics
Discrete Output Modules
Suitable for devices like relays and simple solenoids.
Can switch low-voltage or high-voltage loads.
Backplane Function
Carries power and data signals between modules.
Acts as a backbone for communication.