Autorange; Filter; Frequency - Beckhoff EL3681 Documentation

Value
dec
0
1
2
3
Value
dec
255
0
1
2
Table 3: Measurement type and measuring ranges
Measuring range
The Range value can be regarded as power of ten (10^x).
5.5.3

Autorange

The Autorange function selects the best measuring range for the selected measurement type. In Autorange
mode the current measuring ranges represent separate types of measurement, i.e. it is not possible to switch
between 1 A and 10 A (Reason: different input contacts; the 1 A range is protected with a 1.25 A fuse).
Deactivation of Autorange (index 0x8000:09 [} 155], see note)
The Autorange function is deactivated if the measuring range is not transferred (Tx PDO 0x1A00
[} 161] selected) and "scaled" view is not active.
The limits for changing the measuring ranges range are 10% above the full scale value (extended measuring
range, larger range) and 10% of the full scale value (smaller range). If "Left aligned" view is selected, the
limits are 100% and 5% of the full scale value.
5.5.4

Filter

Filter (index 0x8000:04 [} 155])
The built-in filter averages the values for the last half second. If the measuring range is changed the filter is
reset. The filter is active by default. If the filter is switched off the terminal supplies approx. 16 measured
values per second.
5.5.5

Frequency

Frequency, index 0x8000:0A [} 155]
Depending on the filter bit (50/60 Hz) the integration time is 20 ms (50 Hz setting) or 16 2/3 ms (60 Hz
setting), in each case resulting in one measured value. Interference from the mains voltage can be avoided
through appropriate selection of the integration time. Several measurement readings are consolidated and
issued as process data approx. every 500 ms, if the filter is activated. If the filter is deactivated the EL3681
supplies approx. 16 measurement readings per second.
EL3681
hex
0x00
0x01
0x02
0x03
hex
0xFF
0x00
0x01
0x02
Version: 3.0
Measurement type (mode)
DC voltage
AC voltage
DC current
AC current
Measuring range
300 mV / 100 mA
3 V / 1 A
30 V / 10 A
300 V (voltage only)
Commissioning
145