Applications Guide Tracer Graphical Programming - Trane

®
Simplifying the program with an Or block
Figure 44: ProgramwithSwitchblockconnectedcorrectly
4. Compile the program. No errors should appear.
5. From the File menu, choose Save As to save the program under a new
name.
The program illustrated in Figure 44 completely fulfills the sequence of
operation. The Deadband block compares the Equip Rm Space Temp and
the Equip Rm Temp Setpoint and turns the fan on and off as required. If
the Equip Rm Space Temp input fails, the Equip Rm Alarm indicates the
failure and the fan remains on.
SimplifyingtheprogramwithanOr
block
Logic blocks perform basic logic operations. The Or block may be used as
a simpler alternative to the Switch block in the Exhaust Fan program.
UsetheOrblocktocheckthelogicoftheFailblockandtheDeadband
block. If either the Fail block is true or the Deadband block is true, the
Equip Rm Fan On/Off output is true (on).
Programming tip:
Keep programs as simple as possible.
To simplify the program with an Or block:
1. Delete the Switch block.
2. Delete the ON constant block.
3. From the Blocks menu, choose Logic. From the Logic menu, choose
Or.
4. Click in the design space to place the Or block where the Switch block
used to be.
5. Connect the wire leaving the Fail block to the upper input port of the
Or block.
6. Connect the output port of the Deadband block to the lower input port
of the Or block.
CNT-APG001-EN 41