Siemens Bits, Index 0X80N0:05; Undershoot And Overshoot Of The Measuring Range (Underrange, Overrange); Notch Filter (Conversion Times) - Beckhoff ELX3312 Operating Manual

Parameterization and programming
5.3.2

Siemens bits, index 0x80n0:05

If this bit (index 0x80n0:05 [} 74]) is set, status displays are shown for the lowest three bits. In the error case
overrange or underrange, bit 0 is set.
5.3.3 Undershoot and overshoot of the measuring range
(underrange, overrange)
U > Uk : Index 0x60n0:02 [} 76] and index 0x60n0:07 [} 76] (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 [} 76] and index 0x60n0:07 [} 76] (underrange and error bit) are set. The
k max
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.
5.3.4

Notch filter (conversion times)

The ELX331x terminals are equipped with a digital filter. The filter performs a notch filter function and
determines the conversion time of the terminal. It is enabled via index 0x80n0:06 [} 74] parameterized via
index 0x80n0:15 [} 74]. 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
The filter frequencies are set for all channels of the ELX331x terminals centrally via index 0x8000:15
[} 74] (channel 1). The corresponding indices 0x8010:15 of the ELX3312 or 0x8010:15,
0x8020:15, 0x8030:15 of the ELX3314 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 for ELX3312 (2 channels)
3 measurements (thermocouple, wire breakage, cold junction), filter 50 Hz
2 channels * 3 measurements * (1/50 Hz) + 6 ms ≈ 126 ms
Example for ELX3314 (4 channels)
3 measurements (thermocouple, wire breakage, cold junction), filter 50 Hz
4 channels * 3 measurements * (1/50 Hz) + 12 ms ≈ 252 ms
58 Version: 1.3.0 ELX3312 and ELX3314