Timeout expired: DAQ read and plot

Hey, I have a signal from the signal generator over a PCI-6123 and it should be read in with Matlab and be plotted. But it is an infinite signal and startForeground does not work, is there a possibility to sampel the signal (with inputSingleScan) for e.g. 3 seconds, make an array with the values and then plot these? Or is there any other possibility to read in and Plot the signal? Here is my code and my output

if true
  devices = daq.getDevices
devices()
s = daq.createSession('ni');
addAnalogInputChannel(s,'Dev1', 0, 'Voltage');
s.Rate = 8000
data = s.inputSingleScan
[data,time] = s.startForeground;
plot(time,data);
xlabel('Time (secs)');
ylabel('Voltage')
end

output:

devices =

ni: National Instruments PCI-6123 (Device ID: 'Dev1') Analog input subsystem supports: 4 ranges supported Rates from 0.1 to 500000.0 scans/sec 8 channels ('ai0' - 'ai7') 'Voltage' measurement type

   Digital subsystem supports:
      Rates from 0.1 to 10000000.0 scans/sec
      8 channels ('port0/line0' - 'port0/line7')
      'InputOnly','OutputOnly','Bidirectional' measurement types

   Counter input subsystem supports:
      Rates from 0.1 to 20000000.0 scans/sec
      2 channels ('ctr0','ctr1')
      'EdgeCount','PulseWidth','Frequency' measurement types

   Counter output subsystem supports:
      Rates from 0.1 to 20000000.0 scans/sec
      2 channels ('ctr0','ctr1')
      'PulseGeneration' measurement type

ans =

ni: National Instruments PCI-6123 (Device ID: 'Dev1') Analog input subsystem supports: 4 ranges supported Rates from 0.1 to 500000.0 scans/sec 8 channels ('ai0' - 'ai7') 'Voltage' measurement type

   Digital subsystem supports:
      Rates from 0.1 to 10000000.0 scans/sec
      8 channels ('port0/line0' - 'port0/line7')
      'InputOnly','OutputOnly','Bidirectional' measurement types

   Counter input subsystem supports:
      Rates from 0.1 to 20000000.0 scans/sec
      2 channels ('ctr0','ctr1')
      'EdgeCount','PulseWidth','Frequency' measurement types

   Counter output subsystem supports:
      Rates from 0.1 to 20000000.0 scans/sec
      2 channels ('ctr0','ctr1')
      'PulseGeneration' measurement type

s =

Data acquisition session using National Instruments hardware: Will run for 1 second (8000 scans) at 8000 scans/second. Number of channels: 1 index Type Device Channel MeasurementType Range Name ----- ---- ------ ------- --------------- ---------------- ---- 1 ai Dev1 ai0 Voltage (Diff) -10 to +10 Volts

data =

   -0.1007

Timeout expired before operation could complete.