I-Bus 0818D, User Manual

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Chapter 3 - Hardware
0818D User’s Guide 3-7
3.4.1 Indicators and Controls
Figure 3-1 is a drawing of the front plate of the CMC Board. LED
indicators and pushbutton controls on the board are as follows:
3.4.1.1 Critical Alarm LED (CR)
This Red LED, when illuminated, indicates the presence of a Critical
Alarm condition.
3.4.1.2 Major Alarm LED (MJ)
This Orange LED, when illuminated, indicates the presence of a
Major Alarm condition.
3.4.1.3 Minor Alarm LED (MN)
This Yellow LED, when illuminated, indicates the presence of a
Minor Alarm condition.
3.4.1.4 Alarm Cut Off LED (ACO)
This Yellow LED, when illuminated, indicates that the audible alarm,
which sounds upon the occurrence of an alarm condition, has been
silenced by the ACO OFF pushbutton. Should another alarm
condition occur while the previous alarm condition is still present, the
LED will be extinguished and the audible alarm will again sound.
3.4.1.5 CMC Health LED (CMC)
Normally, this LED is illuminated Green. Should any software or
hardware malfunction cause the CMC Board to become inoperative,
this LED will turn Red. It will also turn Red temporarily during a reset
of the CMC processor initiated by the RST pushbutton.
3.4.1.6 Reset Pushbutton (RST)
This pushbutton restarts the processor on the CMC Board. There is
little reason to use it in normal operation unless the user is doing
software development.
3.4.1.7 LED Test Pushbutton
This pushbutton initiates a test cycle of the five LEDs on the front
plate of the CMC Board. Each LED, beginning with the Critical
Alarm LED, will be illuminated for approximately one second. The