Home / B&R / reACTION Technology modules / B&R X20RT8401 – I/O module, 4 digital input channels

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B&R X20RT8401 – I/O module, 4 digital input channels

MPN: X20RT8401 · Brand: B&R

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12-month warranty (new) · 3-month (used/refurbished)

30-day returns, no restocking fee on unused parts

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Quick facts

Availability	Confirmed on request
Category	reACTION Technology modules
Lifecycle	Active
Warranty	12-month (new) · 3-month (used/refurbished)
Datasheet	Manufacturer datasheet ↗

Shipping & availability

When can X20RT8401 be shipped?

X20RT8401 is sourced on request — request a quote and we'll confirm the exact availability and shipping timeline for this specific unit.

Can I pick up X20RT8401 in person?

Local pickup from our Groningen, Netherlands warehouse may be possible — contact us before ordering to check availability and arrange a collection time.

Is express delivery available?

Yes — mention it when you request a quote for X20RT8401 and we'll include express shipping options in our reply.

My factory is down and I need this urgently — can you help?

For a critical breakdown, contact us directly at +31 (0)50-7110348 or sales@partnerplc.com — we can look into same-day courier or dedicated taxi/hotshot delivery for X20RT8401, subject to availability and destination.

• reACTION technology module

• 4 high-speed digital inputs

• 4 high-speed digital channels, configurable as inputs or outputs

• 1 high-speed analog input ±10 V

• 1 high-speed analog output ±10 V

• 1 ABR incremental encoder input 24 V

• Pulse width modulation

• 24 VDC and GND for encoder supply

• Supports blackout mode

This reACTION technology module has 4 high-speed digital inputs and 4 high-speed digital mixed channels. All connections are designed for 1-wire connections . All inputs are designed for sink connections; the outputs are designed for push-pull connections.

A voltage signal of ±10 V can be read or output using an analog input and analog output, respectively.

Ultrafast reACTION Technology makes it possible to control the integrated I/O channels with response times down to 1 μs . All of the commands that can be used for reACTION programs are provided as function blocks in special libraries ( e.g. AsIORTI). Programming in compliance with IEC 61131-3 requirements takes place in the Function Block Diagram editor in Automation Studio.

The module supports blackout mode. In blackout mode, programmable module functionality persists even if the network fails.

Accessories

Required accessories (order separately)

X20BM31	Bus modules — Bus module for double-width I/O modules; The internal I/O supply is interconnected The bus module serves as a basis for all double-width X2…
X20TB12	Terminal blocks — Tool-free wiring with push-in technology; Simple wire release using lever; Ability to label each terminal; Plain text labeling also possibl…

Specifications

Short description

I/O module

4 digital input channels, 4 digital channels configurable as inputs or outputs, 1 analog input ±10 V, 1 analog output ±10 V, reACTION Technology

General information

Diagnostics – Module run/error	Yes, using LED status indicator and software
Diagnostics – Outputs	Yes, using LED status indicator and software (output error status)
Diagnostics – Inputs	Yes, using LED status indicator and software
Diagnostics – Channel type	Yes, using software
Support – reACTION-capable I/O channels	Yes
Blackout mode – Scope	Module
Blackout mode – Function	Programmable
Blackout mode – Standalone mode	No
Power consumption – Bus	0.01 W
Power consumption – Internal I/O	1.7 W
Application memory – Type	64 Mbit flash memory
Application memory – Data retention	20 years at 55°C
Application memory – Guaranteed erase/write cycles	100,000
Certifications – CE	Yes
Certifications – UKCA	Yes
Certifications – CRA (Cyber Resilience Act)	In preparation
Certifications – ATEX	Zone 2, II 3G Ex nA nC IIA T5 Gc; IP20, Ta (see X20 user's manual); FTZÚ 09 ATEX 0083X
Certifications – UL	cULus E115267; Industrial control equipment
Certifications – DNV	Temperature: B (0 to 55°C); Humidity: B (up to 100%); Vibration: B (4 g); EMC: B (bridge and open deck)
Certifications – CCS	Yes
Certifications – LR	ENV1
Certifications – KR	Yes
Certifications – ABS	Yes
Certifications – BV	EC33B ; Temperature: 5 - 55°C; Vibration: 4 g; EMC: Bridge and open deck
B&R ID code	0xE55C
Status indicators	I/O function per channel, operating state, module status
Additional power dissipation caused by actuators (resistive) [W]	+1.1
Type of signal linesX20 shielding brackets".">	Shielded lines must be used for all signal lines, line length: Max. 20 m (note: See section)

Encoder power supply

Output voltage	24 VDC -15% / +20%
Output currentDerating and hardware configuration".">	Module-internal, max. 600 mA (note: See section)
Short-circuit proof, overload protection	Yes

Digital inputs

Input filter – Hardware	<3 µs
Input filter – Software	Default 200 ns, configurable between 200 ns and 5 ms in 10 ns intervals
Switching threshold – Low	<5 VDC
Switching threshold – High	>15 VDC
Quantity	4 standard inputs and 4 mixed channels, configuration as input or output using software
Nominal voltage	24 VDC
Input voltage	24 VDC -15% / +20%
Input current at 24 VDC	Typ. 1.3 mA
Input circuit	Sink
Connection type	1-wire connections
Input resistance	18.16 kΩ
Insulation voltage between channel and bus	500 V eff

ABR incremental encoder

Quantity	1
Encoder inputs	24 V, asymmetrical
Counter size	32-bit
Input frequency	Max. 333 kHz
Evaluation	4x

Analog inputs

Output format – Data type	INT
Output format – Voltage	INT 0x8001 - 0x7FFF / 1 LSB = 0x0008 = 2.441 mV
Output of digital value during overload – Undershoot	0x8001
Output of digital value during overload – Overshoot	0x7FFF
Max. error – Gain	0.08% (note: Based on the current measured value.)
Max. error – Offset	0.018% (note: Based on the 20 V measurement range.)
Common-mode rejection – DC	86 dB
Common-mode rejection – 50 Hz	84 dB
Quantity	1 (note: To reduce power dissipation, B&R recommends bridging unused inputs on the terminal.)
Input	±10 V
Input type	Differential input
Digital converter resolution	±12-bit
Input impedance in signal range	20 MΩ
Input protection	Protection against wiring with supply voltage
Permissible input signal	Max. ±30 V
Conversion procedure	SAR
Input filter	Third-order low-pass filter / Cutoff frequency 130 kHz
Max. gain drift	0.003 %/°C (note: Based on the current measured value.)
Max. offset drift	0.001%/°C (note: Based on the 20 V measurement range.)
Common-mode range	±12 V
Nonlinearity	0.015% (note: Based on the 20 V measurement range.)
Insulation voltage between channel and bus	500 V eff
Sampling frequency	500 kHz

Digital outputs

Switching delay – 0 → 1	<1 µs
Switching delay – 1 → 0	<1 µs
Switching frequency – Resistive load	Max. 500 kHz
QuantityDerating and hardware configuration".">	4 mixed channels, configuration as input or output using software (note: See section)
Variant	Push-Pull
Nominal voltage	24 VDC
Switching voltage	24 VDC -15% / +20%
Nominal output current	100 mA
Total nominal current	400 mA
Connection type	1-wire connections
Output circuit	Sink or source
Output protection	Thermal shutdown in the event of overcurrent or short circuit (see value "Short-circuit peak current")
Diagnostic status	Output monitoring with delay <700 ns
Leakage current when the output is switched off	Approx. 25 µA
R DS(on)	140 mΩ
Residual voltage	<0.4 V at nominal current 100 mA
Max. continuous current	100 mA
Peak short-circuit current	<10 A
Switch-on in the event of overload shutdown or short-circuit shutdown	Approx. 3 ms
Insulation voltage between channel and bus	500 V eff

Analog outputs

Max. error – Gain	0.15% (note: Based on the current output value.)
Max. error – Offset	0.05% (note: Based on the entire output range.)
Output format – Data type	INT
Output format – Voltage	INT 0x8000 - 0x7FFF / 1 LSB = 0x0008 = 2.441 mV
Quantity	1
Output	±10 V
Digital converter resolution	±12-bit
Conversion time	2 μs
Settling time on output change over entire range	5 μs
Switch on/off behavior	Internal enable relay for startup
Output protection	Short-circuit proof
Load per channel	Max. ±10 mA, load ≥1 kΩ
Short-circuit proof	Current limiting ±65 mA
Output filter	First-order low-pass filter / cutoff frequency 22 kHz
Max. gain drift	0.022 %/°C (note: Based on the current output value.)
Max. offset drift	0.032%/°C (note: Based on the entire output range.)
Error caused by load change	Max. 0.14%, from 10 MΩ → 1 kΩ, resistive
Nonlinearity	0.005% (note: Based on the output range.)
Insulation voltage between channel and bus	500 V eff

Electrical properties

Electrical isolation

Channel isolated from bus; Channel not isolated from channel

Operating conditions

Mounting orientation – Horizontal	Yes
Mounting orientation – Vertical	Yes
Installation elevation above sea level – 0 to 2000 m	No limitation
Installation elevation above sea level – >2000 m	Reduction of ambient temperature by 0.5°C per 100 m
Degree of protection per EN 60529	IP20

Ambient conditions

Temperature – Horizontal mounting orientation	-25 to 60°C
Temperature – Vertical mounting orientation	-25 to 50°C
Temperature – Derating	See section "Derating and hardware configuration".
Temperature – Storage	-40 to 85°C
Temperature – Transport	-40 to 85°C
Relative humidity – Operation	5 to 95%, non-condensing
Relative humidity – Storage	5 to 95%, non-condensing
Relative humidity – Transport	5 to 95%, non-condensing

Mechanical properties

Note	Order 2x terminal block X20TB12 separately. ; Order 1x bus module X20BM31 separately.
Pitch	25 +0.2 mm

Downloads & documentation

Official documents from B&R, downloaded directly from the manufacturer.

Data sheets & manuals

Data sheet X20RT8401	PDF · 2 MB · 1.33 (03/26/2026) - EN
X20 System User´s Manual	PDF · 50 MB · 4.40 (03/10/2026) - EN
reACTION Technology user´s manual	PDF · 13 MB · 1.22 (03/16/2026) - EN

CAD & dimension drawings

3D File DXFSTEP X20 Double IO Slice

ZIP · 117 KB · 1.00 (08/29/2019)

Certificates (10)

64331_A1 BV Certificate of Compliance X20	PDF · 1 MB · 2026_05 (05/05/2026)
CCS Type Approval Certificate - X20	PDF · 285 KB · 1.00 (06/28/2024)
E115267 UL Certificate of Compliance X20	PDF · 3 MB · 2026_08_27 (08/27/2026)
EU Data Act - X20 IO - Connected Product Information Notice	PDF · 92 KB · 1.00 (09/30/2025)
EU Declaration ATEX X20	PDF · 218 KB · 2023-07 (09/05/2023)
EU Declaration of conformity PLC X20	PDF · 169 KB · 2021/10 (11/08/2021)
KR Type Approval Certificate MIL39390-AC003 (X20 System)	PDF · 320 KB · 2.0 (05/05/2025)
Lloyds Register (X20 only)	PDF · 884 KB · 1.30 (07/07/2025)
TAA00000BJ DNV Type Approval Certificate X20	PDF · 186 KB · 13.0 (05/04/2026)
UK Declaration PLC X20	PDF · 151 KB · 2024-01 (01/18/2024)