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PLC Hardware Components - Coggle Diagram
PLC Hardware Components
IO Section
Input Interface
Discrete Inputs
Push buttons
Limit switches
Analog Inputs
Temperature sensors
Pressure sensors
Output Interface
Discrete Outputs
Motors
Solenoid valves
Analog Outputs
Control valves
Speed drives
Chassis and Rack
Chassis
Physical Structure
Holds CPU
Holds IO modules
Slot Capacity
4 slots
8 slots
16 slots
Rack
Logical Rack
128 inputs
128 outputs
IO Groups
Group 0 to 7
16 bits per group
IO Modules
Module Construction
PCB
Signal conditioning
Terminal Block
Field wiring
Module Types
Input Modules
AC input
DC input
Output Modules
Relay output
Transistor output
Module Density
Standard Density
8 points
16 points
High Density
32 points
64 points
Addressing System
Rack Slot Addressing
PLC 5
Rack number
Group number
SLC 500
Slot number
Terminal number
Address Elements
Type
Input
Output
Bit and Word
Bit level addressing
Word level addressing
Address Examples
Input
I:3/8
I1:0/0
Output
O:4/15
O0:1/1
Remote IO
Remote Rack
Location
Away from CPU
Reduces wiring
Station Number
Unique identification
Communication Media
Fiber Optic
Long distance
Noise immune
Coaxial Cable
Medium distance
Noise sensitive
Advantages
Installation
Flexible layout
Performance
Less voltage drop