RE-TRANSMITTED ANALOG OUTPUT (Optional)
T h e r e - t r a n s m i t t e d a n a l o g o u t p u t o p t i o n t r a n s m i t s a d i g i t a l l y
programmable 4 to 20 mA or 0 to 10 VDC signal to drive chart recorders,
remote indicators and controllers. The option is contained on the upper PCB
and has two outputs,
“ANALOG-” (TBB #10)
and
“” (TBB #11)
and is self-powered
(active)
with a compliance of 10 VDC. The ground of the
output is isolated from both the signal input common and output common,
eliminating problems from ground loops. Programming of the option is
performed in
“Pro 8”
of the normal programming mode. Display values are
simply keyed in to provide a 4 mA or 0 VDC output,
“AN-LO”
, and a 20 mA
or 10 VDC output,
“AN-HI”
. The analog output then follows the assigned
value and as such will update every measurement cycle. Nonstandard current
or voltage ranges can be supported by calculating the slope and intercept of
the display/output and calculating the required display values at 4 mA or 0
VDC and 20 mA or 10 VDC. Reverse action can be achieved by programming
a
“high”
display value for
“AN-LO”
and a
“low”
display value for
“AN-HI”
.
If the display should indicate an
“OLOLOL”
or
“ULULUL”
the analog
output will go to 20 mA or 10 VDC for an open and 4 mA or 0 VDC for a short.
Note: Analog “-” must be kept isolated from alarm Common (TBB #8 or #9).
-35-
ANALOG OUTPUT DIAGRAMS
