Applications Guide Tracer Graphical Programming - Trane

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Writing the alarms program
Indicating auto-reset alarms
The remaining diagnostic conditions require auto-reset alarms. Use the
TGP module in Figure 121.
Figure 121: Auto-reset alarms
Controlling alarm indication and reset
Based on the status of both auto-reset and manual reset alarms, the last
module manages alarm indication and reset (Figure 122 on page 132).
• Use a Latch block to indicate the alarm status.
• Be sure that auto-reset alarms clear automatically, but manual reset
alarms require a manual reset.
• Use a Switch block to automatically return the binary variable,
Alarm Reset, to a value of off (as presented in the cooling tower program
in Chapter 4, “Cooling tower with two-speed fan example”).
CNT-APG001-EN 131