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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 (_______).
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
Discrete I/O modules
The common type of I/O interface module is the (________).
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If a device receives current when it is ON, it is said to be (_______) current
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If a device provides current when it is ON, it is said to be (________) current
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It can accept an input signal that varies in the positive direction only.
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Swing between a maximum negative value and a maximum positive value
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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.
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Provides pulse trains to a stepper-motor translator, which enables control of a stepper motor.
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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.
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Description
PLC Midterm
