Applications Guide Tracer Graphical Programming - Trane
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Applications Guide Tracer Graphical Programming - Trane

Applications Guide Tracer Graphical Programming - Trane Applications Guide Tracer Graphical Programming - Trane

trane.com
28.09.2014 Views

® Chapter 2 Writing the exhaust fan program Figure 16: Constant block in design space Constant block 3. Double-click on the Constant block to open the Constant Properties dialog box (Figure 17). Figure 17: Constant Properties dialog box 4. Under Type, click the Analog option. 5. In the Value field, type: 85.0 6. To set the number of digits right of the decimal, in the Decimal Places field, type: 1 7. Click OK. The block value is changed to 85.0 (Figure 18). Figure 18: Constant block set to 85.0 20 CNT-APG001-EN

® Adding a comment Adding a comment Use comments to make notes in your program, to annotate blocks, or to describe logic. Place a comment under the 85.0 constant block indicating that it is being used as the equipment room temperature setpoint and that it is in degrees Fahrenheit. To add a comment: 1. From the Blocks menu, choose Comment and click in the design space to place the Comment block. The Comment dialog box appears. 2. Type: Equip Rm Temp Setpoint (°F) 3. Click OK. The comment appears in the design space (Figure 19). Figure 19: Comment added to describe the Constant block Comment block Arranging blocks As the saying goes, “A picture is worth a thousand words.” In graphical programming, because the picture tells a story, the way the picture looks becomes very important. Move blocks and use the alignment options to arrange your blocks and design your programs. Selecting and moving blocks Practice selecting and moving blocks in the design space. To select and move blocks: 1. Press and hold the left mouse button on a block and then move the cursor (click and drag) to move the block to a new position in the design space. 2. To select two or more blocks, press the Ctrl key while clicking to select blocks. The selected blocks are outlined in yellow. Note: You can also use a rubber-band selection to select more than one block. Click in the design space and drag the cursor so that the white line surrounds the blocks you want to select. 3. Click and drag the selected blocks to a new position in the design space. CNT-APG001-EN 21

®<br />

Chapter 2 Writing the exhaust fan program<br />

Figure 16: Constant block in design space<br />

Constant<br />

block<br />

3. Double-click on the Constant block to open the Constant Properties<br />

dialog box (Figure 17).<br />

Figure 17: Constant Properties dialog box<br />

4. Under Type, click the Analog option.<br />

5. In the Value field, type:<br />

85.0<br />

6. To set the number of digits right of the decimal, in the Decimal Places<br />

field, type:<br />

1<br />

7. Click OK. The block value is changed to 85.0 (Figure 18).<br />

Figure 18: Constant block set to 85.0<br />

20 CNT-APG001-EN

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