Applications Guide Tracer Graphical Programming - Trane

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Chapter 3 Modifying the exhaust fan program
Figure 39: Program with Fail block
Figure 40: Programwithswitchblock
Using a Switch block
The sequence requires that the fan be on when the input is failed. The
mechanism, known as the Switch block, provides the ability to choose
between two data paths based on a controlling binary value. See the block
reference in the online Help for more information about the Switch block.
Adding a Switch block
1. Move the Equip Rm Temp Setpoint variable, the 5.0 constant, and the
Deadband blocks down.
2. Move the Equip Rm Alarm variable and Equip Rm Fan On/Off output
blocks to the right to make room for the Switch block.
3. Delete the connection between the Deadband block and the Equip Rm
Fan On/Off output block.
4. From the Blocks menu, choose Function. From the Function menu,
choose Switch.
5. ClickinthedesignspacetoaddaSwitchblock(Figure40).
6. Set the Switch block property to binary.
Switch block
38 CNT-APG001-EN