RE-TRANSMITTED ANALOG OUTPUT (Optional)
The re-transmitted analog output option transmits a digitally 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-” (Terminal #10)
and
“” (Terminal #11)
and is
self-powered
(active)
with a compliance of 10 VDC. The analog
“-”
output is
isolated from the signal input 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
“OLOLOL”
the analog output will go to 20 mA
or 10 VDC.
Note: Analog “-” must be kept isolated from alarm Common (TBB #8).
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ANALOG OUTPUT DIAGRAMS