Section 1 Intro to PLC Flashcards
A process consisting of discrete I/O is best controlled via a program which is developed
in __________.
Ladder diagrams
Analog controlled processes are commonly controlled by __________ language programs.
Function block diagram
__________ are used if section of your code deals with a batch process and is developed in a graphical format sequence of states.
Sequential function charts
Manipulating complex mathematical operations are done in programs written in
__________ language.
Structured text
What are the main hardware components of a PLC?
1) Chassis: holds modules
2) Power supply: powers the modules
3) Processor unit: CPU runs and stores programs
4) Input/Output interface: communicates with field I/O’s
5) Network Modules: Network card and Fieldbus card
List all the industrial programming languages defined in IEC 61131-3?
1) Ladder diagrams
2) Function block diagrams
3) Structured text
4) Sequential function charts
5) Instruction lists
Why are IEC 61131-3 languages defined through a standard and are not vendor
proprietary?
Once a programmer becomes familiar with one vendor’s implementation of a standard, learning another vendor’s implementation standard is much easier. This increases productivity.
Ladder logic programs can not handle Analog I/Os (T/F)
False
Function Block diagram programs can only be developed using Allen-Bradley RS-Logix
software. (T/F)
False
Mastering one industrial language for one vendor makes it easy to transfer these skills
and apply it to any other vendor software? (T/F)
True
Assuming a specific vendor, procedure of creating tags to refer to some I/O in Structured
text will certainly change if an SFC program is developed. (T/F)
False
What is the function of the power supply in a PLC?
Provide power to all I/O modules in the chassis. This does not power field devices.
