X20CM8281 B&R Digital Channels

Products Mode: X20CM8281
Place of Origin: AT

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X20CM8281 B&R Digital Channels 
  • Digital and analog channels
  • Selectable current and voltage for AI and AO
  • Counter functions

The module is a universal mixed module. On this module, digital I/O and analog I/O are combined. A current or voltage signal can be used for the analog I/O as desired. Counter functions on two of the digital inputs expand the range of use.

Short description
I/O module 4 digital inputs, 2 digital outputs, 1 analog input, 1 analog output, special functions
General information
B&R ID code 0x24C3
Status indicators I/O function per channel, operating state, module status
Module run/error Yes, using LED status indicator and software
Analog inputs Yes, using LED status indicator and software
Digital outputs Yes, using LED status indicator and software (output error status)
Power consumption  
Bus 0.01 W
Internal I/O 1.75 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 Temperature: B(0 - 55°C)
Humidity: B(up to 100%)
Vibration: B(4 g)
EMC: B(bridge and open deck)
KR Yes
KC Yes
Digital inputs
Quantity 4
Nominal voltage 24 VDC
Input characteristics per EN 61131-2 Type 1
Input voltage 24 VDC -15% / +20%
Input current at 24 VDC Typ. 3.3 mA
Input circuit Sink
Input filter  
Hardware ≤2 µs
Software Default 1 ms, configurable between 0 and 25 ms in 0.2 ms increments
Connection type 1-wire connections
Input resistance Typ. 7.18 kΩ
Additional functions 20 kHz event counting, gate measurement
Switching threshold  
Low <5 VDC
High >15 VDC
Insulation voltage between channel and bus 500 Veff
Event counters
Quantity 2
Signal form Square wave pulse
Evaluation Each negative edge, cyclic counter
Input frequency Max. 20 kHz
Counter 1 Input 1
Counter 2 Input 3
Counter frequency Max. 20 kHz
Counter size 16-bit
Gate measurement
Quantity 1
Signal form Square wave pulse
Evaluation Positive edge - Negative edge
Counter frequency  
Internal 48 MHz, 24 MHz, 12 MHz, 6 MHz, 3 MHz, 1.5 MHz, 750 kHz, 375 kHz, 187.5 kHz
Counter size 16-bit
Length of pause between pulses ≥100 µs
Pulse length ≥20 µs
Supported inputs Input 4
Analog inputs
Quantity 1
Input ±10 V or 0 to 20 mA / 4 to 20 mA, via different terminal connections
Input type Single-ended
Digital converter resolution  
Voltage ±12-bit
Current 12-bit
Conversion time 400 µs, conversion runs asynchronous to the X2X Link cycle
Output format INT
Output format  
Voltage INT 0x8001 - 0x7FFF / 1 LSB = 0x0008 = 2.441 mV
Current INT 0x0000 - 0x7FFF / 1 LSB = 0x0008 = 4.883 µA
Input impedance in signal range  
Voltage >1 MΩ
Current -
Voltage -
Current <300 Ω
Input protection Protection against wiring with supply voltage
Permissible input signal  
Voltage Max. ±15 V
Current Max. ±50 mA
Output of digital value during overload  
Voltage 0x8001
Current 0x0000
Voltage 0x7FFF
Current 0x7FFF
Conversion procedure Successive approximation
Input filter Second-order low-pass filter / Cutoff frequency 1 kHz
Max. error  
Gain 0.08% 
Offset 0.02% 
Gain 0 to 20 mA = 0.08% / 4 to 20 mA = 0.1% 
Offset 0 to 20 mA = 0.03% / 4 to 20 mA = 0.16% 
Max. gain drift  
Voltage 0.01%/°C 
Current 0 to 20 mA = 0.009 %/°C
4 to 20 mA = 0.0113 %/°C 
Max. offset drift  
Voltage 0.002%/°C 
Current 0 to 20 mA = 0.004 %/°C
4 to 20 mA = 0.005 %/°C 
Voltage <0.02% 
Current <0.02% 
Insulation voltage between channel and bus 500 Veff
Digital outputs
Quantity 2
Variant Current-sourcing FET
Nominal voltage 24 VDC
Switching voltage 24 VDC -15% / +20%
Nominal output current 0.5 A
Total nominal current 1 A
Connection type 1-wire connections
Output circuit Source
Output protection Thermal shutdown in the event of overcurrent or short circuit, integrated protection for switching inductive loads, reverse polarity protection
Diagnostic status Output monitoring with 10 ms delay
Leakage current when the output is switched off 5 µA
RDS(on) 105 mΩ
Peak short-circuit current <14 A
Switch-on in the event of overload shutdown or short-circuit shutdown Approx. 10 ms (depends on the module temperature)
Switching delay  
0 → 1 <250 µs
1 → 0 <270 µs
Switching frequency  
Resistive load Max. 100 Hz
Inductive load See section "Switching inductive loads".
Braking voltage when switching off inductive loads Typ. 50 VDC
Insulation voltage between channel and bus 500 Veff
Analog outputs
Quantity 1
Output ±10 V or 0 to 20 mA, via different terminal connections
Digital converter resolution 12-bit
Conversion time 300 µs, conversion runs asynchronous to the X2X Link cycle
Settling time on output change over entire range 1 ms
Switch on/off behavior Internal enable relay for startup and errors
Max. error  
Gain 0.04% 
Offset 0.0225% 
Gain 0.05% 
Offset 0.125% 
Output protection Short-circuit proof
Output format  
Voltage INT 0x8001 - 0x7FFF / 1 LSB = 0x0010 = 4.882 mV
Current INT 0x0000 - 0x7FFF / 1 LSB = 0x0010 = 9.766 µA
Load per channel  
Voltage Max. ±10 mA, load ≥ 1 kΩ
Current Max. load is 400 Ω
Max. gain drift  
Voltage 0.012%/°C 
Current 0.014 %/°C 
Max. offset drift  
Voltage 0.0075% / °C 
Current 0.03 %/°C 
Error caused by load change  
Voltage Max. 0.02%, from 10 MΩ → 1 kΩ, resistive
Current Max. 0.5%, from 1 Ω → 400 Ω, resistive
Nonlinearity <0.1% 
Insulation voltage between channel and bus 500 Veff
Electrical properties
Electrical isolation
Channel isolated from bus

Channel not isolated from channel
Operating conditions
Mounting orientation  
Horizontal Yes
Vertical Yes
Installation elevation above sea level  
0 to 2000 m No limitation
>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 See section "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 terminal block X20TB12 separately.
Order 1x bus module X20BM11 separately.
Pitch 12.5+0.2mm