PiXtend eIO Hardware Manual
6.5.2.2 Current outputs
Property
Value
Comment
Type of outputs
analog output
according to IEC 61131-2
direct current (DC)
in the positive area
Operating mode
current output (AO-I)
Conversion method
string DAC
one converter per channel
Current ratings
0..20 mA
also usable for 4..20 mA
output
Load impedance range
≤ 600 Ω
also called "burden"
Digital resolution
12 Bit
Smallest digital step (LSB)
4.88 µA
Max. error at 25°C **
+/- 0.25 % (+/- 50 µA)
of the range of values,
depending on the
potentiometer setting
Temperature coefficient
+/- 0.01 % pro °C
in the range 0 - 60 °C
ambient temperature
Data format
16 bit integer
raw value (right-justified)
Overload protection
yes
up to idle
Overload detection
yes
Overload & wire break
evaluated by software
Permitted cable length
< 3 m
< 30 m
unshielded cables
shielded cables
Table 26: Technical data – analog current outputs
** Under EMC exposure deviations of up to 1% (based on the final scale value) are
possible.
Warning!
The external supply of voltages (for example 24 V) to analogue outputs
is not permitted and can lead to the failure of the outputs.
Always make sure that there is no wiring fault before connecting the
analog outputs.
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