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Short description
I/O module 2 analog inputs 4 to 20 mA or 0 to 25 mA
General information
B&R ID code 0xB784
Status indicators I/O function per channel, operating state, module status, sensor supply per channel
Module run/error Yes, using status LED and software
Inputs Yes, using status LED and software
Sensor power supply Yes, using status LED and software
Power consumption
Bus 0.05 W
Internal I/O 1.15 W
External I/O 1.5 W
Additional power dissipation caused by actuators (resistive) [W] -
CE Yes
ATEX Zone 2, II 3G Ex nA nC IIA T5 Gc
IP20, Ta (see X20 user's manual)
FTZÚ 09 ATEX 0083X
UL cULus E115267
Industrial control equipment
HazLoc cCSAus 244665
Process control equipment
for hazardous locations
Class I, Division 2, Groups ABCD, T5
DNV GL Temperature: B (0 - 55°C)
Humidity: B (up to 100%)
Vibration: B (4 g)
EMC: B (bridge and open deck)
KR Yes
KC Yes
Analog inputs
Input 4 to 20 mA or 0 to 25 mA, configurable using software
Input type Differential input
Digital converter resolution 15-bit
Data output rate 4.7 to 960 samples per second, configurable using software
Output format INT
Output format
4 to 20 mA INT 0x0000 - 0x7FFF / 1 LSB = 0x0001 = 488.281 nA
0 to 25 mA INT 0x0000 - 0x7FFF / 1 LSB = 0x0001 = 762.939 nA
0 to 25000 µA INT 0x0000 - 0x61A8 / 1 LSB = 0x0001 = 1000 nA
Load I_IN ≥ 0.1 mA: R < 8000 Ω
I_IN ≥ 1 mA: R < 1100 Ω
I_IN ≥ 4 mA: R < 510 Ω
Input protection Up to 30 VDC, reverse polarity protection (max. 0.1 A)
Open-circuit detection Yes, using software
Permissible input signal 0 to 25 mA
Output of digital value during overload Configurable
Conversion procedure Sigma-delta
Max. error
0 to 25 mA <0.046%
4 to 20 mA <0.046%
0 to 25 mA <0.004%
4 to 20 mA <0.013%
Common-mode rejection
DC 80 dB
50 Hz Depends on the sampling rate: e.g. >130 dB for 50 scans per second
Common-mode range 0 to 7 V
Nonlinearity <0.003%
Input filter
Hardware 1st-order low pass / cutoff frequency 2.5 kHz
Software Sinc4 filter
Max. gain drift
0 to 25 mA 0.003 %/°C
4 to 20 mA 0.003 %/°C
Max. offset drift
0 to 25 mA 0.0002 %/°C
4 to 20 mA 0.0007 %/°C
Test voltage
Channel - Channel 1000 VAC
Channel - Bus 1000 VAC
Channel - Ground 1000 VAC
Sensor power supply
Nominal voltage 25 V ±2%
Nominal output current Max. 30 mA
Short-circuit proof Yes, continuous
Electrical isolation
Sensor power supply - Channel No
Sensor power supply - Sensor power supply Yes
Max. voltage ripple
Up to 100 kHz ≤2.2 mV
Up to 1 MHz ≤22 mV
Higher ≤100 mV
Short-circuit current
Typical <50 mA
Maximum 60 mA
Behavior on short circuit Current limitation
Electrical properties
Electrical isolation Channel isolated from channel and bus
Operating conditions
Mounting orientation
Horizontal Yes
Vertical Yes
Installation elevation above sea level
0 to 2000 m No limitations
>2000 m Reduction of ambient temperature by 0.5°C per 100 m
Degree of protection per EN 60529 IP20
Ambient conditions
Horizontal mounting orientation -25 to 60°C
Vertical mounting orientation -25 to 50°C
Derating -
Storage -40 to 85°C
Transport -40 to 85°C
Relative humidity
Operation 5 to 95%, non-condensing
Storage 5 to 95%, non-condensing
Transport 5 to 95%, non-condensing
Mechanical properties
Note Order 1x X20TB12 terminal block separately
Order 1x X20BM11 bus module separately
Pitch 12.5+0.2 mm
Material number:
  • 2 analog current measurement inputs
  • Electrically isolated analog channels
  • Electrically isolated sensor supplies
  • 16-bit digital converter resolution
  • NetTime timestamp: Moment of measurement

The module is equipped with 2 current measurement inputs with 16-bit digital converter resolution.

Each current measurement input has its own sensor supply. The two channels with their respective sensor supplies are electrically isolated from each other. The user can select between the two measurement ranges 4 to 20 mA and 0 to 25 mA.

Mandatory Accessories
Bus modules
X20BM11 X20 bus module, 24 VDC keyed, internal I/O supply continuous
X20BM15 X20 bus module, with node number switch, 24 VDC keyed, internal I/O supply continuous
Terminal blocks
X20TB12 X20 terminal block, 12-pin, 24 VDC keyed
Automation Studio HW Upgrades Version (Date) Download
V2.7 HW Upgrade (X20AI2437) EXE / 869 KB
V3.0 HW Upgrade (X20AI2437) EXE / 1 MB
V4.0 HW Upgrade (X20AI2437) EXE / 756 KB
Certificates Version (Date) Download
244665 CSA HazLoc Certificate of Compliance X20, X67 PDF / 56 KB
ABS Certificate of Product Design Assessment - X20 IO Series PDF / 2 MB
DNV GL Type Approval Certificate - X20 / Power Panel T30 PDF / 164 KB
E115267 UL CoC X20 PDF / 847 KB
FTZU 09 ATEX 0083X PDF / 697 KB
KR Type Approval Certificate MIL39390-AC003 (X20 System) PDF / 758 KB
Lloyds Register PDF / 506 KB
X20, X67 KC certificates PDF / 6 MB
Documentation Version (Date) Download
Data sheet X20AI2437 PDF / 348 KB
X20 System User´s Manual PDF / 56 MB
E-CAD (Electro or EPLAN Templates) Version (Date) Download
X20 EPLAN P8 from V2.4 EXE / 161 MB
M-CAD (Mechan. Templates) Version (Date) Download
3D File DXF/STEP X20 Electronic module ZIP / 10 KB
3D File STEP X20 I/O-Slice ZIP / 872 KB
Dimensions PDF X20 Electronic module PDF / 3 KB

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