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NOTE:
Pressing
the
1620
R
eset
key
produces the
same
effect as
pressing
the
1711
R
eset
key.
Operat01' En try
K
ey.
Press
ing
the
Operator
Entry
key
turns
on
the
Operator
Entry indicator
(18).
The
indi-
cator
may
be
interrogated
by Branch Indicator
instruc-
tions
to
determine
if an
operator entry from the
1711
is required. If the indicator is on,
the
program
branches
to
a subrou
tine
which
reads the Manual Entry
switches
(special
feat ure) .
If the Interrupt
feature is installed,
pressing the Operator Entry key also
initi
ates
an inter-
rupt which
causes a
branch to
an interrupt
identifica-
tion
subroutine.
Emergency Pow
er
Off
Switch.
Pulling
the Emergency
Power
Off switch
drops DC power
a
nd
turns
off
the
blower motors
in
the
1711
-
this may
cause
damage
to
electroni
c
components. Once the switch
is
pulled
a
Customer
E ngineer
must
be
ca lled
to
reset
it
so
that
the
Power
On
/
Off switch
may be
used
to restore
DC
power to the
1711
.
Register Indicators
The
indi
cators
on
the
1711
Operator's
Panel
are
shown
in
Figure 35.
Input
Poin
t
Selected.
The
BCD
value of the
terminal
address
in
TAS
is
displayed as
shown in Figure
35.
ADC
Output.
The
BCD value of
the
converted signal
in the
ADC
register
is
displayed
.
The Negative light in-
dicates the
conversion of a
nega
tive
analog
voltage.
Function
Perform
ed.
The
Q,
modifier digit
is
dis-
played
in
BCD
form.
Program Indicators
Operator En try.
This
light
turns
on and off
in
con-
junction
with
the
on
/
off
sta
tus
of
the
Opera
tor
Entry
indica
tor
(18).
SIOC RESP
(Response).
This light turns
on when
anyone of
the 1710
Process Operator
Units is in
a
re-
spo nse status,
indi
ca
ting
readiness
to tra
nsmit
or
receive
data.
It
will also
be turned
on
by the
SIOC
Output
Error
indicator
(6043) or
by the Data Ready indicator
(6044).
When the
SIOC
is
not busy, the
same signal
tha
t turns
on
the light
will also
turn
on the Any SIOC
indicator
(45)
to
request an
interrupt.
T
AS Check. This
light
turns on and off
in
conjunc-
tion with the
on/off status of
the
TAS
Check indicatOl
(21)
.
M'PLEX
(Multiplexer)
Busy
.
This light turns on
and off
in
conjuction
with the on/off status
of
the
Multiplexer
Busy indicator
(29).
AO
(Analog O
utpu
t)
Check.
This light turns
on and
off
in
conjunction
with the
on/off status of the Analog
Output Check indicator (23).
56
Figure 35
.
1711 Register
and
Indicator
Lights
FR
(Function
R
egister)
Check
.
This light turns
on
if
there is
an
invalid digit or
parity
error in the Function
Register.
Flag Op. This light is on during operations involv-
ing the 1710 Process Operator
Units
when data is being
transferred
from the Input
/
Output Data Register to
1620
core
storage. This light is
not on
when
da
ta
is
transferred
from the
I
/
O unit to the Input
/
Output
Data
Register.
Output Error. This light turns
on
with the
SIOC
Out-
put Error indicator (6043) to indicate that
a
transmis-
sion
error (parity error) has been detected by
a
1710
Process Operator
output
unit. The indicator
and
light
are
turned
off
by programmed interrogation
of
the
indi-
cator or
by pressing the 1711 Reset key.
IODR. This 7-bit BCD display
shows
the
contents of
the single-digit Input/Output
Data
Register.
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