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SECTION II.
OPERATOR'S CONTROL PANEL
VOLTAGE Indicator
..
-~
If the Model 120 ceases operating due to an undervoltage or an overvoltage of a d-c power
supply, the VOLTAGE indicator is illuminated, and the d-c power to the system is removed.
The RESET DC OFF indicator is illuminated red, and the DC ON indicator is turned off.
The
VOLTAGE indicator may be reset by depressing the STOP button and then the RESET DC OFF
button.
FAN Indicator
If the Model 120 ceases operating due to a temperature check, the FAN indicator is illu-
minated, and d-c power to the system is removed.
Also, the RESET DC OFF indicator is illu-
minated, and the DC ON indicator is turned off.
When the AC OFF indicator is illuminated, the
FAN indicator is normally illuminated also.
CB Indicator
If the Model 120 cease s operating due to a circuit breaker actuation, the CB indicator is
illuminated, and d-c power to the system is removed.
Also, the RESET DC OFF indicator is
illuminated, and the DC ON indicator is turned off.
EXTERNAL Indicator
This indicator operates in conjunction with external interrupt processing.
It is illuminated
automatically whenever the central processor enters the external interrupt mode.
Provided that
the four conditions outlined on page 2-10 are satisfied, the external interrupt mode is entered in
anyone of the following three ways:
1.
By receipt of an interrupt signal from a peripheral control;
2.
By pressing the control panel INTERRUPT button when the central processor
is in the RUN mode or by pressing the INTERRUPT and INSTRUCT buttons
when the central processor is in the STOP mode; and
3.
By execution of a programmed Monitor Call (MC) instruction.
During processing, the external interrupt mode is terminated and the EXTERNAL indicator
is reset (extinguished) when the program executes a Resume Normal Mode (RNM) instruction.
Pressing the INITIALIZE button when the system is in the STOP mode also resets the external
interrupt mode and extinguishes the EXTERNAL indicator; however, the indicator remains illu-'
minated as long as the INITIALIZE button is held depressed.
PROGRAM Indicator
This indicator is located adjacent to the EXTERNAL indicator in the lower right corner of
the control panel (see page 2-11). The PROGRAM indicator is illuminated whenever a program
2-12
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