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-” (TBB #10) and “ANALOG+” (TBB #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 (0 VDC) and 20 mA (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 (10 VDC) for an open and 4 mA (0 VDC) for a short.
Note: Analog “-” must be kept isolated from alarm comm. (TBB #8).
-36-
ANALOG OUTPUT DIAGRAMS
To Next Page
Loading...
Need help?
General
