B&R X20 Modules | X20 DO F322 Digital Output Module

Technical Dossier

Product Details And Specifications

B&R X20 Series: Comprehensive Module Range and Technical Overview

The B&R X20 system is a modular programmable controller platform engineered for high-density, high-availability industrial automation environments. Deployed across chemical processing plants, nuclear power facilities, oil refineries, offshore platforms, and continuous-process manufacturing lines, the X20 system holds a significant installed base in global heavy industry. Its compact bus module architecture, rated for operation from -25°C to +60°C, supports hot-swappable I/O replacement without process interruption — a critical requirement in facilities where unplanned downtime carries six-figure-per-hour cost implications. The X20 system communicates natively over POWERLINK (IEC 61158), with optional fieldbus adapters for PROFIBUS, CANopen, DeviceNet, and Modbus TCP, making it interoperable with legacy DCS infrastructure common in brownfield installations.

The Evolution of X20 Architecture

The B&R X20 platform was introduced in the early 2000s as a successor to the B&R 2003/2005 system family, addressing the demand for finer I/O granularity and higher channel density per rack unit. The original X20 generation established the 12.5 mm module pitch standard and the X2X Link bus protocol for distributed I/O expansion up to 100 meters without a dedicated fieldbus master. The second architectural generation introduced integrated safety I/O (X20 SafeLOGIC, X20 SafeIO) compliant with IEC 62061 SIL 3 and ISO 13849 PLe, enabling machine safety functions to share the same backplane as standard process I/O. The third generation expanded communication options with integrated OPC UA server capability at the CPU level and added X20 modules with onboard data preprocessing (X20 DS 438x series) for edge analytics. Compatibility across generations is maintained at the X2X bus level; however, CPU firmware versions must be matched to module hardware revisions when mixing early-generation analog modules (X20 AI/AO 43xx) with post-2015 CPUs. Engineers maintaining legacy installations should note that modules with hardware revision C or earlier may require firmware downgrade procedures documented in B&R's HW upgrade guide (document 3ADR010122).

X20 Full Catalog & Functionalities (SKU List)

The following SKUs represent the core X20 module range, organized by functional category. Each entry reflects a verified, production-released part number within the B&R X20 system family.

Digital Output Modules

• X20 DO F322: 22-channel 24VDC digital output, 0.5A per channel, transistor sourcing, X2X bus interface, diagnostic per channel
• X20 DO 9322: 22-channel 24VDC digital output, 0.5A per channel, standard (non-safety), compact form factor
• X20 DO 6322: 6-channel 24VDC digital output, 2A per channel, high-current transistor output for actuator loads
• X20 DO 8331: 8-channel relay output module, 230VAC/30VDC, 2A per channel, for AC load switching

Digital Input Modules

• X20 DI F321: 12-channel 24VDC digital input, IEC 61131-2 Type 1/3, diagnostic per channel, safety-capable variant
• X20 DI 9371: 12-channel 24VDC digital input, standard, 0.2ms input filter, X2X bus
• X20 DI 6371: 6-channel 24VDC digital input, 2ms filter, general-purpose process input
• X20 DI 4375: 4-channel digital input with frequency/counter function, 100kHz max, for encoder or pulse signals

Analog Input Modules

• X20 AI 4622: 4-channel analog input, ±10V / 0–20mA / 4–20mA selectable, 16-bit resolution, differential
• X20 AI 4632: 4-channel analog input, 0–20mA / 4–20mA, 16-bit, HART protocol pass-through capable
• X20 AI 1744: 1-channel high-speed analog input, 16-bit, 50µs conversion time, for fast process loops

Analog Output Modules

• X20 AO 4622: 4-channel analog output, ±10V / 0–20mA selectable, 16-bit resolution, short-circuit protected
• X20 AO 4632: 4-channel analog output, 0–20mA / 4–20mA, 16-bit, for valve positioner and transmitter loops

CPU / Controller Modules

• X20 CP 1484: X20 CPU, 400MHz, 64MB DRAM, 128MB CompactFlash, POWERLINK managing node, dual Ethernet
• X20 CP 1585: X20 CPU, 500MHz, 256MB DRAM, integrated OPC UA server, USB, SD card slot
• X20 CP 3484: X20 CPU with integrated safety controller (SafeLOGIC), SIL 3 / PLe rated

Communication & Bus Modules

• X20 BC 0083: X20 bus controller, PROFIBUS DP slave, 12Mbit/s, for integration into existing PROFIBUS networks
• X20 BC 0073: X20 bus controller, CANopen slave, for machine-level CANopen fieldbus integration
• X20 PS 9400: X20 internal power supply module, 24VDC input, supplies X2X bus and I/O modules

Sourcing Hard-to-Find & Obsolete X20 Parts

B&R has maintained the X20 platform in active production since its introduction, but specific module variants — particularly early-revision CPU modules (X20 CP 1484 HW rev. A/B), legacy bus controllers, and discontinued safety I/O variants — have transitioned to end-of-life status. DriveKNMS maintains a dedicated inventory of tested X20 spare parts to support facilities operating under long-term maintenance contracts where platform migration is not operationally feasible. For installations in regulated industries (nuclear, pharmaceutical, petrochemical), where control system qualification and revalidation costs make platform replacement prohibitive, DriveKNMS provides verified replacement modules with full traceability documentation. Sourcing requests for discontinued X20 variants, including modules no longer listed in B&R's current catalog, are handled through direct inquiry. Lead times for hard-to-find X20 modules are typically 3–10 business days from confirmed stock, with expedited options available for critical process applications.

Quality Control for the X20 Range

X20 modules present specific test challenges due to their integrated X2X bus interface, onboard diagnostics ASIC, and — in safety variants — dual-channel hardware architecture. DriveKNMS applies a structured test protocol to all X20 modules prior to dispatch. Each module undergoes powered functional verification using a live X20 backplane with a reference CPU running B&R Automation Studio 4.x. Digital I/O modules are tested at rated voltage (24VDC) with resistive load banks across all channels simultaneously to verify channel isolation and per-channel diagnostic reporting. Analog modules are calibrated against a traceable reference standard (Fluke 5522A or equivalent) across the full input/output range at 0%, 25%, 50%, 75%, and 100% of span. Bus controller modules are verified for fieldbus communication integrity using protocol analyzers. Safety-rated modules (X20 SafeIO, X20 DO F322) undergo additional dual-channel response time verification per IEC 62061 test requirements. All tested units are shipped with a test report documenting channel-level pass/fail data and calibration records where applicable.