Analog inputs

AM 280/A AM 282/A AM 280/B

Number of inputs 4 4 4

Type Voltage input Voltage input Current input

Resolution 14 bit 16 bit 14 bit

Signal range ±10 V or 0 – Uref (10 V) ±10 V or 0 – Uref (10 V) 0 – 20 mA or 4 – 20 mA

Max. measurement signal ±10.4 V ±10.4 V-0.8 mA … 20.8 mA

Input type Differential or single-ended Differential or single-ended Differential

Galvanic isolation No No No

Reference voltage output 10 V ±2.5 %; max. 20 mA 10 V ±2.5 %; max. 20 mA

Scan repeat cycle 1 ms 1 ms 1 ms

Input impedance in signal range 10 MΩ 10 MΩ < 200 Ω

Input filter characteristic First order First order First order

Limiting frequency of the input filter 250 Hz 250 Hz 250 Hz

Conversion method Successive approximation Successive approximation Successive approximation

Monotonicity without error codes Yes Yes Yes

Common mode range ±13.5 V ±13.5 V ±13.5 V

Common mode rejection ratio > 80 dB > 80 dB > 80 dB

Value of the lowest bit (LSB) 1.3 mV 1.3 mV 1.35 μA

Maximum permitted continuous load

(without damage) ±30 V

Typ. temp. coefficient measurement error ±5 ppm of scale end value / °C

Max. temp. coefficient measurement error ±20 ppm of scale end value / °C

Largest error at 25 °C ±0.01 % of scale end value