Technical \ Data of the Analog Inputs

Number of channels per module	4
Distribution of channels into groups	1 group of 4 channels
Connections of the channels I0- to I3-	Terminals 1.0 to 1.3
Connections of the channels I0+ to I3+	Terminals 2.0 to 2.3
Input type	bipolar (not with current or Pt100/Pt1000/Ni1000)
Electrical isolation	against internal supply and other modules
Configurability	0…10 V, -10…+10 V, 0/4…20 mA, Pt100/1000, Ni1000 (each input can be configured individually)
Channel input resistance	Voltage: > 100 kΩ, current: ca. 330 W
Time constant of the input filter	Voltage: 100 µs, current: 100 µs
Indication of the input signals	one LED per channel
Conversion cycle	2 ms (for 8 inputs + 8 outputs), with Pt/Ni… 1 s
Resolution	Range 0…10 V: 12 bits Range -10…+10 V: 12 bits + sign Range 0…20 mA: 12 bits Range 4…20 mA: 12 bits
Conversion error of the analog values caused by non-linearity, adjustment error at factory and resolution within the normal range	typ. 0.5 %, max. 1 % For XC version below 0 °C and above 60 °C: on request
Relationship between input signal and hex code	tables Input ranges voltage, current Analog Input/Output Module AX521 and digital input and Input ranges resistance Analog Input/Output Module AX521
Unused voltage inputs	are configured as “unused”
Unused current inputs	have a low resistance, can be left open-circuited
Overvoltage protection	yes