
The B&R X20CM8281 is a universal mixed I/O module combining digital and analog capabilities in a single compact unit within the X20 system family. It features 4 digital inputs (24 VDC, sink configuration with 1-wire connections), 2 digital outputs (0.5 A, source configuration with 1-wire connections), 1 analog input with selectable ±10 V or 0 to 20 mA / 4 to 20 mA range, and 1 analog output with selectable ±10 V or 0 to 20 mA output. Two of the digital inputs support advanced counter functions that can operate as event counters or gate measurement inputs. The module uses a 12-bit converter resolution for both analog input and output channels, with a conversion time of 300 µs. It is designed for cabinet mounting applications in industrial automation systems and supports ATEX compliance for use in hazardous environments.
Item Details
- Brand Name: B&R
- Manufacturer: B&R Industrial Automation
- Item Type Name: Universal Mixed Module I/O
- Product Family / Series: X20 System
Product Specifications
- digital_inputs: 4 inputs, 24 VDC, sink, 1-wire connections
- digital_outputs: 2 outputs, 0.5 A, source, 1-wire connections
- analog_input: 1 input, ±10 V or 0 to 20 mA / 4 to 20 mA, 12-bit resolution
- analog_output: 1 output, ±10 V or 0 to 20 mA, 12-bit resolution
- counter_functions: 2 counters as event counters or gate measurement
- analog_conversion_time: 300 µs
- analog_settling_time: 1 ms
- digital_input_filter: Configurable in 100 µs steps
- supply_voltage: 24 VDC
- power_dissipation_bus: 0.01 W
- power_dissipation_internal: 1.75 W
- isolation_voltage: 500 V effective
- operating_temperature: -25 °C to 60 °C
- switching_frequency_resistive: Max. 100 Hz
- braking_voltage_inductive: Typ. 50 VDC
Additional Details
- Certifications / Approvals: ATEX, CE II 3G Ex nA nC IIA T5 Gc, cULus, cCSAus, DNV GL, Lloyd's Register, KR, ABS, EAC, KC
- Mounting Type: Plug-in
- Module Configuration: 3-part design: terminal block, electronics module, bus module
All PLC Direct products come with a 1-year warranty. The warranty is issued by PLC Direct. Warranty coverage commences at the date of purchase. The warranty is for mechanical defects or failures not caused by human factors including but not limited to (a) incorrect installation, (b) operating the unit in sub-optimal conditions or in scenarios not recommended by the manufacturer, (c) poor unit maintenance, etc. The warranty does not cover programming or software related issues.
If the product is eligible for PLC Direct’s warranty coverage and the customer encounters an issue with the product, we will request the item is shipped to us for diagnosis and examination. Regardless of the cause of product issues, the customer will bear responsibility for the cost of shipping the unit to PLC Direct for evaluation. Where the unit was damaged by human factors, we will offer a repair or replace quote; in cases where damage was caused by human factors, the customer is responsible for the cost of shipping the repaired/replaced unit from PLC Direct to the customer. Where the unit was not damaged by human factors but is covered by PLC Direct’s warranty, we will repair or replace the unit at our cost (or, in rare cases, refund you your purchase); in such cases, PLC Direct will bear the cost of shipping the repaired or replaced product back to the customer. It is up to PLC Direct’s discretion whether to repair, replace, or refund the customer in such cases. Diagnoses can take time to complete based on technician availability and the complexity of diagnosis.
In no event shall PLC Direct be liable for any damages except actual damages up to, but not exceeding, the amount paid to us for the product, including we shall not be liable for any consequential or indirect damages or lost profits whether or not advised of same.
PLC Direct offers free shipping worldwide. Product ship from a various warehouses worldwide based on the customer's and the product's location. The estimated delivery date on the product page is PLC Direct's best estimated assuming a US-based shipping destination.
Regardless of where the product is shipping from, PLC Direct covers all duties for US-based shipping destinations. For non-US-based shipping destinations, customers are responsible for duties as appropriate.
PLC Direct's focus is on balancing price with lead time. Some but not all products can be expedited. If you have questions about delivery ETAs, please contact our team.

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