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to
ground upon
activation
of that
switch.
If
the
panel
is
not included,
this line
should be
returned
to
+6V
with
a
resistor
of
less than
lOOK.
START
LINES
(XSRT-,
XXSRT+,
XXGND-
)
When
these input
lines
to
the
controller
are properly manipulated and
the
XLDSW-
line
is
ground or
the
load switch
on
the
panel
is
active, the
controller
will
go
into the
load
mode.
If
the
XXSS-
line
is
+6V
and
the
run
switch
on
the
panel
is
in the
run
position, the
machine
will start.
If
neither condition
(load
or
run)
is
true, the
controller
will
single
execute an instruction and
halt.
If
both are
true, the
result
is
undefined.
To
operate
these
lines, the
XXGND-
line
is
permanently connected
to
ground.
This
informs
the
controller logic
of
the
presence
of the
external
control.
To
initiate
one
of
the
above
actions,
first
XXSRT+
is
made
passive
(+6V)
and
XSRT-
is
grounded.
Then
XSRT-
is
made
passive
(+6V)
and
XXSRT+
is
grounded.
The
action
is
initiated
when
XXSRT+
is
at
ground.
The
unit
is
designed
to
be driven
from
a
form
C momentary
switch
(SPDT,
non-bridging)
with
the
armature
grounded,
XSRT-
connected
to
the
normally open
contact
and
XXSRT+
connected
to
the
normally
closed
contact.
The
unit
is
designed
to
accept switch
bounce
where
the
contact
opens and
closes
a
number
of
times
but not
if
the
armature bounces from
contact
to
contact.
If
the
machine
control interface
is
used and
the
full
control panel
is
not included,
line
XSRT-
should be returned
to
+6V
with
a
resistor
of
lOOK
or less.
RUN
INDICATOR
(TRUN-X)
This output
line
from
the
controller
will
be active (ground)
when
the
machine
is
running.
The
line will
be passive
(+6V)
when
the
machine
is
stopped or
halted.
Figure
5-1
shows
the
design
of a
typical
remote
control panel.
Table
5-1
shows
the
pin
assignments,
signals,
and
their function for the
machine
control interface.
Table
5-1.
Machine
Control
Interface Signals
Pin
Mnennonics
Function
1_18
---
Not
Used
19
XCLR-
Master
Clear
(input)
20
TRUN-X
Run
Indicator
(output)
21
XXSS-
Stop
Line
(input)
22
XLDSW-
Load
Line
(input)
23
XSRT-
Start
Line
(input)
24
XXSRT+
Start
Line Reset
(input)
25
XXGND-
Ground
to
Start
Logic
(input)
26-32
Not
Used
5-2
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