Underrange, Overrange; Notch Filter (Conversion Times) - Beckhoff EL33-00 Series Documentation

Commissioning
5.6.3

Underrange, Overrange

Undershoot and overshoot of the measuring range (underrange, overrange), index 0x60n0:02,
0x60n0:03 [} 159]
• U > Uk : Index 0x60n0:02 [} 159] and index 0x60n0:07 [} 159] (overrange and error bit) are set. The
k max
linearization of the characteristic curve is continued with the coefficients of the overrange limit up to the
limit stop of the A/D converter or to the maximum value of 0x7FFF.
• U < Uk : Index 0x60n0:01 [} 159] and index 0x60n0:07 [} 159] (underrange and error bit) are set.
k max
The linearization of the characteristic curve is continued with the coefficients of the underrange limit up
to the limit stop of the A/D converter or to the minimum value of 0x8000.
For overrange or underrange the red error LED is switched on.
5.6.4

Notch filter (conversion times)

Notch filter, index 0x80n0:06 [} 157]
The EL33xx terminals are equipped with a digital filter. The filter performs a notch filter function and
determines the conversion time of the terminal. It is parameterized via the indices 0x80n0:15 [} 157]. The
higher the filter frequency, the faster the conversion time.
Index 0x80n0:06
The filter function is always active even if the bit is not set, since this is obligatory for the measure-
ment process!
The filter characteristics are set via index 0x8000:15 [} 157]
The filter frequencies are set for all channels of the EL33xx terminals centrally via index 0x8000:15
[} 157] (channel 1). The corresponding indices 0x8010:15 of the EL3312 or 0x8010:15, 0x8020:15,
0x8030:15 of the EL3314 have no parameterization function.
Conversion time
The conversion time is determined as follows:
No. of active channels * no. of measurements * no. of filter periods + computing time = conversion
time
Example: EL3311 (1 channel), 3 measurements (thermocouple, wire breakage, cold junction), filter 50
Hz
1 channel * 3 measurements * (1/50 Hz) + 3 ms ≈ 63 ms
Example: EL3314 (2 channels), 3 measurements (thermocouple, wire breakage, cold junction), filter
50 Hz
2 channels * 3 measurements * (1/50 Hz) + 6 ms ≈ 126 ms
Example: EL3314 (4 channels), 3 measurements (thermocouple, wire breakage, cold junction), filter
50 Hz
4 channels * 3 measurements * (1/50 Hz) + 12 ms ≈ 252 ms
150 Version: 4.2 EL33xx-00x0