DAQ-scan variable (where things like motor positions are changed during a run in "steps" or "calibcycles") can also be accessed used the Detector interface. This example is in /reg/g/psdm/sw/tutorials/examplePython/controlData.py.
from psana import *
ds = DataSource('exp=xpptut15:run=200:smd')
cd = Detector('ControlData')
for run in ds.runs():
for nstep,step in enumerate(ds.steps()):
pvList = cd().pvControls()
for pv in pvList:
print 'Step',nstep,'name/value:',pv.name(),pv.value()
for evt in step.events():
pass
if nstep>=2:
import sys
sys.exit()
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