1.1.3.11 - Draw a process diagram PDF

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Lab...

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Lab – Draw a Process Diagram Objective In this activity, you will draw a process diagram based on open-loop and closed-loop processes. Explore tools to produce your own process diagrams.

Background/Scenario Open-loop and closed-loop control systems are two basic types of control systems. In an open-loop system, a controller instructs the plant to perform a predetermined action without any verification of the desired results. A closed-loop control system continuously monitors the performance and adjusts the input as necessary to ensure the desired result is achieved. A process diagram can help you identify and understand the components of a control system. In this activity, you will complete process diagrams for common activities. You will also explore some available tools to produce your own process diagrams.

Part 1: Process Diagram for Open-Loop Control Systems An open-loop control system can process an input condition to produce an output. Fill in the controller and the plant for each process shown below.

Light Switch

Light Bulb

Toaster

Bread

T

What can be added in the process diagrams to verify the desired output has been achieved?

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One thing that can be added in the process diagram to verify that the desired output has been achieved is sensors.

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Activity – Draw a Process Diagram

Part 2: Process Diagram for Closed-Loop Control Systems In a closed-loop control system, the output is monitored to ensure that the desired results are achieved when the process is finished. The sensor in the process diagram provides the feedback information so adjustments can be made during the process. Fill in the controller, plant, and sensor for each process shown below.

Room Temperature

Thermostat Control

Thermostat

Thermostat Sensor

Water Sprinkler System

Sprinkler Control

Water Sprinkler

Soil Moisture Sensor

What other external conditions could affect the system? How would you account for these external variables?

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External variables are factors outside the scope of the experiment, such as a broken button on a remote and not being able to use it. You could take extra steps and precautions to prevent others from messing or creating hurdles in your framework. (Extra controller buttons, security, etc.)

List several smart products available to control indoor temperature and use water efficiently?

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Some of the products available to control indoor temperature and use water efficiently are the following: HVAC, Nest Thermostat, Hydrawise, Honeywell, Blossom, Skydrop, ZEN Thermostat, Rachio 3 smart sprinkler controller, Dual Fuel – Hybrid Heat, Geothermal Heat Pump, Chilled water cooling, Ultra Efficient Boilers, Solar Assist Hot Water, etc.

Part 3: Diagram Software There are many free diagram programs available on the Internet. Draw IO (https://www.draw.io) and Gliffy (https://www.gliffy.com) are just two examples of the online diagram software.

Step 1: Draw IO a. Navigate to www.draw.io. b. Choose the location to which to save the diagrams. c.

Choose to create a new diagram or open an existing diagram. Depending on the location, you will authorize access to the cloud services.

d. If you are creating a new file, provide a new filename. Click Create to continue. e. Explore the different types of icons available. f.

Create a diagram based on the diagrams used in this activity.

Step 2: Gliffy a. Navigate to www.gliffy.com. b. Click Start Drawing to begin creating diagrams. c.

A dialog box with tips appears. You can view the tips, and click Start Drawing to continue.

d. Provide the necessary information to sign up for a free trial account to continue. e. Explore the different types of icons available. f.

Create a diagram based on the diagrams used in this activity.

Step 3: Compare Now that you have used both programs, which program would you prefer for collaboration? Explain.

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After trying both graphing sites, I prefer draw.io. It’s much simpler and doesn’t have that paid to use message plastered everywhere, it took me a while to find the actual graphing site I thought I had to pay to use it. It’s overall, easier to use draw.io it makes simple things exactly that, while gliffy takes a bit longer to do those exact same simple tasks.

DRAW.IO: OPEN-LOOP SYSTEM FOR TOASTING BREAD

INPUT

CONTROLLER

TURN ON LIGHT

LIGHT SWITCH

CONTROL

PLANT

OUTPUT

LIGHT BULB

LIGHT ON

OPEN-LOOP SYSTEM FOR TOASTING BREAD

INPUT

CONTROLLER

TURN ON TOASTER

TOASTER

GLIFFY:

CONTROL

PLANT

BREAD

OUTPUT

TOASTED BREAD...