Count-Up (CTU) Counter: The CTU counter refers to an up counter This counter is used to count an event that occurs logically or externally and places that value in the counter’s accumulator. The accumulated value can even be maintained during false rung conditions and can be reset back to 0 using reset instruction. Math functions: The basic math functions performed by PLCs are as follows: Addition This function is used to add one piece of data to another. It is also called as ADD. Subtraction This function is used to subtract one piece of data from another. It is also called as SUB.

Question

Draw a system/level-0 diagram for this scenario: You are developing a new customer relationship management system for the BEC store, which rents out movies to customers. Customers will provide comments on new products, and request rental extensions and new products, each of which will be stored into the system and used by the manager for purchasing movies, extra copies, etc. Each month, one employee of BEC will select their favorite movie pick of that week, which will be stored in the system. The actual inventory information will be stored in the Entertainment Tracker system, and would be retrieved by this new system as and when necessary. Example of what a level-0 diagram looks like is attached.

Answer 1

Question

Chapter 11, Problem 11P

Program Plan Intro

Count-Up (CTU) Counter:

The CTU counter refers to an up counter

This counter is used to count an event that occurs logically or externally and places that value in the counter’s accumulator.

The accumulated value can even be maintained during false rung conditions and can be reset back to 0 using reset instruction.

Math functions:

The basic math functions performed by PLCs are as follows:

Addition

This function is used to add one piece of data to another.

It is also called as ADD.

Subtraction

This function is used to subtract one piece of data from another.

It is also called as SUB.

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Draw a level-0 diagram for this scenario: You are developing a new customer relationship management system for the BEC store, which rents out movies to customers. Customers will provide comments on new products, and request rental extensions and new products, each of which will be stored into the system and used by the manager for purchasing movies, extra copies, etc. Each month, one employee of BEC will select their favorite movie pick of that week, which will be stored in the system. The actual inventory information will be stored in the Entertainment Tracker system, and would be retrieved by this new system as and when necessary.