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Reliability and Survival Methods > Reliability Block Diagram > Example Using the Reliability Block Diagram Platform
Publication date: 04/21/2023

Image shown hereExample Using the Reliability Block Diagram Platform

In this example, you learn how to create a new Reliability Block Diagram.

1. Select Analyze > Reliability and Survival > Reliability Block Diagram.

A blank Reliability Block Diagram window appears.

Figure 12.2 New Reliability Block Diagram 

New Reliability Block Diagram

Note: The Distribution profiler appears by default.

2. In the Designs panel, select and rename New Diagram 1 to Computer.

The Workspace is now named System Diagram [Computer].

3. Deselect Run in the Start block.

With Run selected, the platform updates the diagram’s reliability calculations after each change to the system diagram. These changes can include adding or deleting components, changing a component’s configuration, and adding or deleting a connection.

With Run deselected, the platform does not update the reliability calculations after any changes.

Tip: Deselect Run when you are diagramming large systems. Select Run when the diagram is complete.

4. Proceed with Add Components.

Add Components

The Reliability Block Diagram drawing elements that are located in the toolbar are called shapes. The term component refers to a shape that represents a constituent part of the system.

1. Click the Basic icon Image shown here on the Shape toolbar and drag the shape to the System Diagram to the right of the Start block.

2. Select the label, replace New Basic 1 by Power Supply, and press Enter.

Figure 12.3 Basic Shape 

Basic Shape

When you click the label or the shape, connection arrows appear. The arrows disappear when you click elsewhere in the template.

3. Drag a second Basic shape to the right of the Power Supply shape.

4. Select the label and type CPU.

Figure 12.4 Example System Diagram 

Example System Diagram

Note: You will align the shapes later, in the section Align Shapes.

5. Drag a Parallel shape Image shown here to a position to the right and below the CPU shape.

6. Select the label and type Peripherals.

7. Drag a K out of N shape Image shown here to a position to the right and above the CPU shape.

8. Select the label and type Hard Drives.

Figure 12.5 Partial System Diagram 

Partial System Diagram

9. Drag a Knot shape Image shown hereto the right of the previous shapes.

10. Select the label and type Join.

11. Drag a Series shape Image shown here to a position to the right of the Knot shape.

12. Select the label and type Input Devices.

Figure 12.6 Partial System Diagram 

Partial System Diagram

13. Drag a Basic shape to a position to the right of the Input Devices shape.

14. Select the label and type Monitor.

Figure 12.7 System Diagram Showing All Shapes 

System Diagram Showing All Shapes

15. Proceed with Align Shapes.

Align Shapes

1. To vertically align the shapes for Hard Drives and Peripherals, select the components:

Hard Drives

Peripherals

Tip: To select shapes, drag the cursor around the shapes or press Shift and click each shape.

2. With the shapes selected, right-click one of the shapes and select Align Selected Vertices Vertically.

3. To horizontally align the remaining shapes, select the following components:

Start

Power Supply

CPU

Join

Input Devices

Monitor

End

4. With the shapes selected, right-click one of the shapes and select Align Selected Vertices Horizontally.

Figure 12.8 Align Shapes Horizontally 

Align Shapes Horizontally

5. Proceed with Connect Shapes.

Connect Shapes

To connect shapes, select a shape to display its connection arrows. Suppose you want to connect shape A to shape B. Select shape A. Drag the right arrow to shape B to indicate that shape A precedes shape B. Drag the left arrow to shape B to indicate that shape B precedes shape A. To connect the shapes in your diagram, select the right arrows to connect to the next shape in the sequence.

1. Select the Start block (blue arrow) to display the connection arrow.

2. Select the single connection arrow Image shown here and drag it to the Power Supply component.

Figure 12.9 Connecting Shapes 

Connecting Shapes

3. For each of the following components, click the first component, select its right connection arrow, and drag the arrow to the second component:

1. Power Supply CPU

2. CPU Hard Drive

3. CPU Peripherals

4. Hard Drives Join

5. Peripherals Join

6. Join Input Devices

7. Input Devices Monitor

8. Monitor End block

Figure 12.10 Completed System Diagram 

Completed System Diagram

4. Proceed with Configure Components.

Configure Components

1. In the Configuration panel, enter the Configuration settings for the components. See Configuration Settings.

Table 12.1 Configuration Settings

Component

Settings

Power Supply

Distribution—Exponential

Theta—1

CPU

Distribution—Exponential

Theta—1

Peripherals

Distribution—Weibull

Alpha—1

Beta—2

N—3

Hard Drives

Distribution—Weibull

Alpha—2

Beta—1

K—1

N—4

Join

Minimum available—1

Input Devices

Distribution—Fréchet

Location—0

Scale—1

N—2

Monitor

Distribution—Exponential

Theta—1

The Reliability Block Diagram is complete (Figure 12.11).

2. Select Run.

The system’s reliability information is updated. This is reflected in the Distribution plot in the Profiler pane.

3. To save the Reliability Block Diagram as a JMP Scripting Language (JSL) file, select File > Save and name it exampleRBDcomplete.jsl.

Figure 12.11 Example Reliability Block Diagram 

Example Reliability Block Diagram

Want more information? Have questions? Get answers in the JMP User Community (community.jmp.com).