Honeywell 200 Series User Manual

SECTION II. OPERATOR'S CONTROL PANEL
operation itself. If the BOOTSTRAP button is pressed while either the PARITY indicator or the
PROGRAM indicator is illuminated, the behavior of the system is unspecified.
SENSE Switches
SENSE
These four illuminated push buttons, numbered from right to left in ascending order, are
used to control program flow, since each can be tested by program instructions which branch
conditionally on a particular setting of the switch. The system should be in the STOP mode
when the setting of a SENSE switch is altered. Otherwise, the results cannot be specified if the
conditional branch instruction is executed within 50 milliseconds after the SENSE switch is
altered. (A SENSE switch reverses its state when pressed, but does so several times for 50
milliseconds before finally assuming its new state; the program must be structured accordingly,
or the SENSE switches must be altered only in the STOP mode. )
If ...
AC ON, AC OFF, DC ON, RESET DC OFF Push-Button Switches •
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When apply power to the system, the AC ON button must be depressed first. The functions
of the power switches are as follows:
1. The AC ON button applies a-c power to the system, illuminate-s the AC ON
indicator, and turns off the AC OFF indicator. The AC ON indicator is
not affected by the power checks, viz., VOLTAGE, FAN, or CB (see
page 2-12).
2. The DC ON button is effective only after the AC ON button has been de-
pressed. The DC ON button applies d-c power to the system, illuminates
the DC ON indicator, and turns off the RESET DC OFF indicator. If the
RESET DC OFF indicator is illuminated red, it must be pressed to enable
the DC ON button to become effective. The DC ON indicator is turned off
by the power checks (see page 2- 12).
3. The AC OFF switch removes both a-c and d-c power from the system,
illuminates the AC OFF and RESET DC OFF indicators, and turns off the
AC ON and DC ON indicators. The AC OFF button is interlocked with
4.
the STOP and RUN buttons. Therefore, to remove a-c power, the STOP
button must be depressed prior to depressing the AC OFF button. If the
RUN button has been depressed, the AC OFF switch is not effective until
the STOP button is depressed.
The RESET DC OFF switch removes d-c power from the system and
illuminates the DC OFF indicator. The RESET DC OFF indicator is
illuminated when an undervoltage or overvoltage condition exists in the
central processor. This switch is also used to extinguish the RESET DC
OFF indicator after a voltage problem has been corrected. This switch
must be depressed before any attempt is made to energize the central
processor after a voltage problem has been corrected. The RESET DC
OFF button is interlocked with the STOP and RUN buttons. Therefore, to
remove d-c power, the STOP button must be depressed prior to depressing
2-9

Honeywell 200 Series Specifications

General

Brand	Honeywell
Model	200 Series
Category	Desktop
Language	English