The AD-AEB 20 GX enables 2-channel analog signal acquisition while providing digitally processed process variables. The signals are provided via an RS485 bus interface. Analog values ??and scaling values ??can be called up via implemented MODBUS commands. All settings regarding scaling or filters are made via MODBUS commands.
The power supply and the RS485 bus connection are possible via the rear DIN rail connector. The device is equipped with two rotary coding switches with which the bus address can be set on the device.
The input current shunt is automatically switched on when reading the current value. With the input signal switches (E1 / E2), each signal input can be permanently connected to the 50 Ohm terminating resistor in order to safely complete current loops even if the supply voltage fails.
The operating voltage is indicated by a green LED. The data communication is signaled by a yellow LED. Invalid measurement signals outside the defined measuring range are detected. In this case, the green LED flashes.
As well as interface settings as well as the device address can be modified during operation by means of Modbus commands. All Modbus register addresses and associated commands are listed in the document attachment.



Conversion of analog process variables in digital information, already in the cabinet. Drastic reduction of wiring work.

Specific characteristics

  • Two analogue inputs can be used as voltage or current input
  • Adjustable filter function
  • Galvanically isolated RS485 bus interface
  • Parameterizable interface settings
  • Hardware switch for device address
  • Galvanically isolated switching power supply
  • Can be parameterized with PC via AD Studio configuration software
  • Status LED for operating voltage and data communication
  • Visual display for invalid measuring signals
  • Modbus master mode

Business data

Order number
Rail connector
Customs tariff number / country of origin 8543 70 90 / Deutschland


Data sheet pdf en-aeb20gx.pdf (213 kB)
Tender text zip (10 kB)
STEP file step gx.step (3 MB)
Safety instructions pdf ad-safety-instructions.pdf (43 kB)

Technical specifications

Current inputs
Measuring range 0 ... 20 mA
Input resistance 50 Ohm
Voltage inputs
Measuring range 0 ... 10 V
Input resistance 100 kOhm
Signal detection
Channel counts (U/I) 2
Basic accuracy < +/- 0,3 %
Temperature influence 80 ppm/K
Sampling rate / resolution 100 ms / 10 bit
Transmission behaviour
Response time Max. 15 ms
Software protocol Modbus-RTU
Data format 19200, e, 8, 1
Max. bus users 99
Bus termination 120 ohms both sides at the end
Max. length of bus 500 m (no spur lines)
Cable Twisted and shielded
Supply voltage 18 ... 30 V DC
Max. power consumption 600 mW (24V DC)
Dimensions (WxHxD) 6,2 x 92 x 101 mm³
Manner of fastening DIN rail mounting 35mm, EN 50022
Type of protection IP 20
Connection method Screw clamp
Bolting torque terminals 0,5 Nm
Wire cross section Max. 2,5 mm2
Weight ~ 70 g
Environmental conditions
Permissible ambient temperature -10 ... +50 °C
Storage and transport -10 ... +70 °C (no condensation)
Product family standard 1) EN 613261
Emission 2) EN 55011, CISPR11 Cl. A, Gr. 1
1) During checking, slight signal deviations are possible.
2) Warning:
This device is not intended to be used in residential areas and can not ensure adequate protection of radio reception in such environments.
Electrical safety requirements
Product family standard EN 61010-1
Galvanic isolation, test voltages
RS485 bus / power supply 1,5 kV, 50 Hz (1 min)
Analog inputs / power supply 1.5 kV, 50 Hz (1 min)
Analog input / RS485 bus 1,5 kV, 50 Hz (1 min)
Analog inputs between themselves 0 kV
Protection circuits
Power supply Electrical surge and reverse current protection

Block and wiring diagram




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