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Intro Plc

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Submitted By overton05
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Module 2 Exercise 1 1. How is memory organized in a PLC?
The memory is organized into two broad categories, Program and Data Memory. By using timers and counters though a ladder logic it allows the PLC to perform calculations, make decisions and do other complex tasks. 2. What is the primary difference between the SLC 500 series and the newer Logix series of PLCs? 3. What is the difference between rack/slot-based memory organization and a tag-based memory system?
In rack/slot-based memory, the programmer assigns the data from an input field device to an input instruction on a ladder rung by specifying the memory location but for the tag based memory the allocation of variable names for program values is not tied to specific memory locations in the memory structure. 4. What is the difference between program files and data files in a PLC system?
The program files store the ladder logic and data files uses timers and counters though a ladder logic 5. What is the function of the data files in the PLC 5 and SLC 500 systems?
Counting function 6. Define the following ControlLogix terms: Project, task, program, main routine, and subroutine
Project- is a collection of all of the program’s element
Task- it holds the information necessary to schedule the program’s execution
Program- executes task
Main routine- is used to call (execute) other routines sub-routines 7. Describe the addressing format for input and output modules used with SLC 500 series processors. rack-based and tag-based addressing schemes because all three Allen Bradley PLC processors are frequently found in automation control schemes 8. Define the following terms in the tag-based addressing system: tag name, alias for, base tag, and type
Tag name- assigned to an area of the controller memory where data is stored.
Alias for- column links the data’s internal memory loca- tion to the descriptive name for the value listed in the Name Tag column
Base tag- a tag that represents the location where the data is stored in memory
Type- indicates the data type that has been assigned to the tag name 9. Describe the difference between retentive and non-retentive memory.
Retentive memory retains, Non- retentive memory permits an output bit 10. Describe all the parts of a PLC scan. input status
Solve the control program and turn internal coils ON/OFF
Update outputs

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