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IEC61131 User and Reference Manual
April 22, 2008
216
Enter the analog input type, 0 through 3, in the Value: entry field and click OK.
The ain1_type parameter sets the analog input type for analog input channel 2. See
ain0_type description above.
The ain2_type parameter sets the analog input type for analog input channel 3. See
ain0_type description above.
The ain3_type parameter sets the analog input type for analog input channel 4. See
ain0_type description above.
The ain4_type parameter sets the analog input type for analog input channel 5. See
ain0_type description above.
The ain5_type parameter sets the analog input type for analog input channel 6. See
ain0_type description above.
The ain6_type parameter sets the analog input type for analog input channel 7. See
ain0_type description above.
The ain7_type parameter sets the analog input type for analog input channel 8. See
ain0_type description above.
The ain_filter parameter sets the input filter for all analog inputs. Filtering is used to dampen
process variations or noise. There are four filter selections available.
An ain_filter value of 0 sets the input filter for 3Hz and the response time to 155ms
at 60Hz and 185ms at 50Hz.
An ain_filter value of 1 sets the input filter for 6Hz and the response time to 85ms at
60Hz and 85ms at 50Hz.
An ain_filter value of 2 sets the input filter for 11Hz and the response time to 45ms
at 60Hz and 55ms at 50Hz.
An ain_filter value of 3 sets the input filter for 30Hz and the response time to 30ms
at 60Hz and 30ms at 50Hz.
To set the ain_filter parameter, click the ain_filter icon and then select the set / channel
parameter command from the Edit menu. The I/O Board parameter dialog is opened as
shown below.
Enter the analog input filter type, 0 through 3, in the Value: entry field and click OK.
The scan_freq parameter sets the input scan rate for all analog inputs. The scan rate
selection is not critical but AC noise rejection is improved at the correct frequency. If the
module is used in a DC environment, the 60 Hz setting will yield slightly faster response
time.