16 Technical Bulletin—TC-9100 Universal Controller
The DAT output type may be configured in output modules OCN1,
OCN3, and OCN5. The DAT output is a digital output (triac) that is
switched on for a duration within the set heating or cooling valve cycle
time in direct proportion to the controller output from 0 to 100%. To
avoid unnecessary switching of the valve actuator when the output is
between 0 and 5% the digital output (triac) remains off, and when the
output is between 95 and 100% the digital output (triac) remains on. The
cycle time is set as a configuration parameter. DAT output modules may
be connected to any programmable module except those configured as
Algorithm 1, 3, or 5.
30% Output50% Output
OFF
ON
DAT Cycle Time DAT Cycle Time
Figure 4: DAT Output
The PAT output type may be configured in pairs of output modules –
OCN1/OCN2, OCN3/OCN4, and OCN5/OCN6.
The PAT output is a pair of digital outputs (triacs) that are switched on to
open and close an incrementally driven heating or cooling valve. The
duration of switching is directly proportional to the change in the
controller output and related to the full stroke time of the valve such that
a 100% change will completely open or close the valve. At the 0% or
100% position, the duration of switching is increased to ensure that the
valve is completely at its end position and the appropriate digital output is
switched on for the full stroke time every two hours to ensure that the
valve remains at its end position. To prevent unnecessary wear on the
actuator, the digital output will only be switched when the output change
exceeds the PAT dead-band (in % of full stroke) in the same direction as
the previous change, or twice the PAT dead-band if the direction of
change is reversed. The full stroke time and PAT dead-band are set as
configuration parameters. PAT output modules may be connected to any
programmable module except those configured as Algorithm 1, 3, or 5.
Duration Adjust
Type (DAT)
Position Adjust
Type (PAT)
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