Podcast
Questions and Answers
Connects all field devices to the CPU and acts as the interface
between them.
Connects all field devices to the CPU and acts as the interface between them.
The input/output (I/O) section
The PLC’s memory system stores information about the status of all the inputs and outputs. To keep track of all this information, it uses a system called (_______).
The PLC’s memory system stores information about the status of all the inputs and outputs. To keep track of all this information, it uses a system called (_______).
Addressing
Represent information elements with each bit, indicating the status of external
contacts or the presence/absence of power in a process circuit.
Connecting to ON/OFF nature field input devices like selector switches and limit switches
Represent information elements with each bit, indicating the status of external contacts or the presence/absence of power in a process circuit.
Connecting to ON/OFF nature field input devices like selector switches and limit switches
Discrete I/O modules
The common type of I/O interface module is the (________).
The common type of I/O interface module is the (________).
Signup and view all the answers
If a device receives current when it is ON, it is said to be (_______) current
If a device receives current when it is ON, it is said to be (_______) current
Signup and view all the answers
If a device provides current when it is ON, it is said to be (________) current
If a device provides current when it is ON, it is said to be (________) current
Signup and view all the answers
It can accept an input signal that varies in the positive direction only.
It can accept an input signal that varies in the positive direction only.
Signup and view all the answers
Swing between a maximum negative value and a maximum positive value
Swing between a maximum negative value and a maximum positive value
Signup and view all the answers
Allows the user to read the signal from an encoder on a real-time basis and stores this information so it can be read later by the processor.
Allows the user to read the signal from an encoder on a real-time basis and stores this information so it can be read later by the processor.
Signup and view all the answers
Provides pulse trains to a stepper-motor translator, which enables control of a stepper motor.
Provides pulse trains to a stepper-motor translator, which enables control of a stepper motor.
Signup and view all the answers
Study Notes
PLC System Components
- The PLC connects all field devices to the CPU and acts as an interface between them.
PLC Memory System
- The PLC's memory system stores information about the status of all inputs and outputs.
- It uses a system to keep track of all this information, representing each bit as an information element indicating the status of external contacts or the presence/absence of power in a process circuit.
I/O Interface Modules
- The common type of I/O interface module is the digital module, which connects to ON/OFF nature field input devices like selector switches and limit switches.
Current in Devices
- If a device receives current when it is ON, it is said to be sinking current.
- If a device provides current when it is ON, it is said to be sourcing current.
Signal Types
- Unipolar signals can accept an input signal that varies in the positive direction only.
- Bipolar signals swing between a maximum negative value and a maximum positive value.
Encoder Interface
- The encoder interface allows the user to read the signal from an encoder on a real-time basis and stores this information so it can be read later by the processor.
- It provides pulse trains to a stepper-motor translator, which enables control of a stepper motor.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Description
PLC Midterm
