Fig. 28 Diagram Signal Delay (Step Response); Fig. 29 Diagram Signal Delay (Linear) - Beckhoff ELX3312 Operating Manual

Basic function principles
Fig. 28: Diagram signal delay (step response)
2.2 Signal delay (linear)
Keyword: Group delay
Describes the delay of a signal with constant frequency
A test signal can be generated externally with a frequency generator, e.g. as sawtooth or sine. A
simultaneous square wave signal would be used as reference.
The signal delay [ms, µs] is then the interval between the applied electrical signal with a particular amplitude
and the moment at which the analog process value reaches the same value.
A meaningful range must be selected for the test frequency, e.g. 1/20 of the maximum sampling rate.
Fig. 29: Diagram signal delay (linear)
3. Additional Information
May be provided in the specification, e.g.
• Actual sampling rate of the ADC (if different from the channel sampling rate)
• Time correction values for run times with different filter settings
• etc.
40 Version: 1.3.0 ELX3312 and ELX3314