
Control Block Description
ADDvantage-32 PLUS
4-23
2. Outputs
OUT: Analog
DN1: Bit
DN2: Bit
3. Implementation
The RAT1 input is the rate in units/second that the transfer takes place when switching
from REF2 to REF1. RAT2 is the rate used when switching from REF1 to REF2. If the
rate input = 0, the transfer is performed without ramping.
When SW goes high, the OUT ramps from REF2 to REF1 until OUT equals REF1, or
when REF1 - REF2 polarity switches from the starting polarity. When this condition
occurs, the DN1 bit goes high and the OUT follows REF1 without ramping.
When SW goes low, the OUT ramps from REF1 to REF2 in the same manner as
previously described. When OUT equals REF2, the DN2 bit goes high and the OUT
follows REF2 without ramping.
When the HOLD bit goes high, the OUT freezes at the current value. When deactivated,
the OUT ramps using the associated rate value to the input value selected by SW. If the
appropriate DONE BIT was set, it will be cleared at the removal of the hold bit until the
ramping is complete.
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