Bcu Reset Procedures; Reset; Clearing Bcu Ram And Reset - Trane Tracer Summit Hardware And Software Installation Manual

Appendix B BCU (BMTS)
232
7. Normal application programs run. Applications may request outputs,
but no outputs to UCMs are actually performed. This allows compet-
ing applications programs to bid for control of various outputs, with-
out causing rapid changes in the physical output devices.
8. Once all application programs have run, outputs to the UCMs are
allowed, and outputs reflecting the current control states are sent to
all UCMs.
9. Once outputs have been sent to all UCMs, the BCU enters normal
operation.

BCU Reset Procedures

If the LED display sequence does not follow the startup sequence, it may
indicate a failure of the BCU. Depending on the failure mode and the
LED status displayed in the seven-segment LED display, you may need
to reset the BCU. Refer to Table 39 on page 229, Table 40 on page 230,
and Table 41 on page 231 for LED codes. There are four levels of reset for
the BCU (listed in order of least to most impact on the BCU):

1. Reset.

2. Clear BCU RAM and Reset.
3. Clear Database, RAM, and Reset.
4. Clear Code, Database, RAM, and Reset.
Except for the power off/on reset, the other reset procedures are typically
done by selecting BCU Reset/Restore from the Tools menu in Tracer Sum-
mit. All of the "Clear . . . Reset" procedures can also be done at the BCU
as described in the following subsections.
Reset
On the BCU, toggle the power at switch S1 off, then back on.

Clearing BCU RAM and Reset

In some cases, it may be desirable to clear the BCU's RAM. This will be
done automatically after a power restoration if the following conditions
exist:
The BCU's code or database has been lost (refer to the following
•
sections).
Corruption of the RAM is detected.
•
• The BCU did not complete its power failure interrupt sequence (for
example, if a Watchdog Timeout occurred, or the processor was reset
due to static discharge).
The BCU had crashed before power was lost.
•
An Ethernet/ARCNET, EIA-232, or modem card was installed or
•
removed during power down.
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