PLC Exam 1
Difference between PC and PLC - Answer-PC- Personal use/functional
PLC- Industrial use
Original Objective of PLC - Answer-Replace control relays
Fixed PLC - Answer-All parts come packaged together, no separation
Modular PLC - Answer-Parts come out, have slots where different parts can be inserted into PLC
Modes of Operation of PLC - Answer-Run-Executes Ladder Diagram and energizes output
Program- Allows Program editing and entry
Remote- Remote test mode, allows online program editing
Difference between RAM and ROM - Answer-Random Access Memory: Content is lost when power is
off; Volatile
Read Only Memory: Nonvolatile
Functions of I/O Modules - Answer-Input Module: Sense presence or absence of input signal
Output module: Provide ON/OFF command signals to drive output devices
Difference between Analog and Digital - Answer-Discrete- Either On or Off
Analog- Can be half on or a third on, temperature gauge
, Remote Types of I/O Modules - Answer-Located away from CPU
Near Field devices
Saves wiring
Communication with processor through communication module
AND Gates - Answer-Series
OR Gates - Answer-Parallel
How to read an address - Answer-I:0/1
I- File type, Either an I or an O
0- Rack Number
1- Terminal Address (bit address)
Rack - Answer-an addressable unit consists of 128 inputs/outputs
Ladder Diagram - Answer-Graphical Language
Most Popular
(one we use)
Functional Block Diagram - Answer-Graphical Language
Sequential Flow Chart - Answer-Graphical Language
Difference between PC and PLC - Answer-PC- Personal use/functional
PLC- Industrial use
Original Objective of PLC - Answer-Replace control relays
Fixed PLC - Answer-All parts come packaged together, no separation
Modular PLC - Answer-Parts come out, have slots where different parts can be inserted into PLC
Modes of Operation of PLC - Answer-Run-Executes Ladder Diagram and energizes output
Program- Allows Program editing and entry
Remote- Remote test mode, allows online program editing
Difference between RAM and ROM - Answer-Random Access Memory: Content is lost when power is
off; Volatile
Read Only Memory: Nonvolatile
Functions of I/O Modules - Answer-Input Module: Sense presence or absence of input signal
Output module: Provide ON/OFF command signals to drive output devices
Difference between Analog and Digital - Answer-Discrete- Either On or Off
Analog- Can be half on or a third on, temperature gauge
, Remote Types of I/O Modules - Answer-Located away from CPU
Near Field devices
Saves wiring
Communication with processor through communication module
AND Gates - Answer-Series
OR Gates - Answer-Parallel
How to read an address - Answer-I:0/1
I- File type, Either an I or an O
0- Rack Number
1- Terminal Address (bit address)
Rack - Answer-an addressable unit consists of 128 inputs/outputs
Ladder Diagram - Answer-Graphical Language
Most Popular
(one we use)
Functional Block Diagram - Answer-Graphical Language
Sequential Flow Chart - Answer-Graphical Language
