Specifications

Analog Output Modules
316
31007715 6/2008
There are 12 significant bits in each data word—bits 14 through 3. They allow you
to represent current data with integer values ranging from 0 to 32,760 in increments
of eight.
The value 32 000 results in a 20 mA output. If the value exceeds 32 000, the output
channel reports an over-current warning (OCW). If the value reaches 32 760, an
over-current error (OCE) is reported. If the value drops below 768, the output
channel reports an under-current warning (UCW), and if the value goes to 0 the
channel reports an under-current error (UCE).
Linear current representations can be interpreted using the formula:
where Cn is the numerical count and Iao is the analog output current.
C
n
I
ao
1600×=
I
C
32 760
32 000
15 mA
20.48 mA
20 mA
24 000
OCE
ao
n
OCW
0 (UCE)
768
0.48 mA
UCW
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