Description
The DO135 B&R is a high-performance, 32-channel Digital Output Module from B&R Industrial Automation’s extensive X20 system, representing the cutting edge of modular, distributed I/O technology. This module is engineered to provide robust and precise control over a wide array of field actuators, including solenoid valves, contactors, motor starters, indicator lamps, and alarm annunciators. The core function of the DO135 B&R is to translate control logic commands from a higher-level B&R PLC (such as an X20 CPU) into definitive switching actions on the factory floor. It acts as the critical executive endpoint in an automation system, converting digital decisions into physical outcomes with speed and reliability. Designed for seamless integration into the scalable X20 backplane bus system, it exemplifies B&R’s philosophy of providing highly deterministic, decentralized control right at the point of action.
As a key component of B&R’s decentralized periphery, the DO135 B&R helps reduce wiring costs and cabinet space by placing control outputs closer to the machinery they operate. The module is designed for exceptional performance in demanding industrial environments, featuring group-to-group isolation to protect the sensitive system backplane from electrical transients and noise present on the field side. Its high channel density (32 points) offers an excellent cost-per-point ratio, making it an economical and efficient choice for applications requiring the control of numerous actuators. The DO135 B&R is more than just an output card; it is a testament to B&R’s commitment to integration, performance, and engineering simplicity, providing a future-proof solution for modern automation challenges.

DO135 B&R
Technical Specifications
| Parameter Name | Parameter Value |
| Product Model | DO135 |
| Manufacturer | B&R Industrial Automation |
| Product Type | 32-channel Digital Output Module |
| Number of Channels | 32 |
| Output Type | Transistor, sinking (NPN) or sourcing (PNP) configurable per group |
| Output Voltage Range | 12 – 24 VDC |
| Max. Output Current per Channel | 0.5 A |
| Max. Total Current per Module | 4 A |
| Short-Circuit Protection | Yes, electronically limited |
| Load Voltage Supply | External 12/24 VDC (L+) via front connector |
| Status Indication | LED per channel (green) for output state |
| Isolation | 500 V AC (between field and system) |
| Response Time | < 100> |
| Connection | Removable front connector for wiring |
| Configuration | Configured via B&R Automation Studio |
Main Features and Advantages
The DO135 B&R is distinguished by its exceptional flexibility and robust design. A key advantage is its configurable output type, which can be set as either sinking or sourcing on a per-group basis via hardware wiring and software configuration. This eliminates the need for different module types and provides unparalleled versatility for integrating with both NPN and PNP field devices, drastically simplifying spare parts management and system design. The module incorporates advanced electronic short-circuit and overload protection for each channel, safeguarding both the module itself and the connected field devices from damage due to wiring faults or excessive current draw. This built-in protection enhances system availability and reduces maintenance costs.
Furthermore, the DO135 B&R is designed for maximum diagnostic capability. Each of the 32 channels features a bright green LED that provides immediate visual feedback on the output status, enabling rapid troubleshooting directly at the module. Its integration into the B&R ecosystem is seamless; the module is automatically recognized and configured through B&R’s powerful Automation Studio software, which also provides extensive diagnostic information and channel-level monitoring. The use of a removable front connector significantly reduces installation and wiring time, while also allowing for easy module replacement without disturbing the field wiring. This combination of diagnostic clarity, protective features, and ease of use makes the DO135 B&R a highly reliable and efficient choice for controlling a multitude of digital actuators.
Application Field
The DO135 B&R finds extensive application across a broad spectrum of industries and machines that require the control of numerous actuators with high reliability. It is a fundamental component in packaging machinery, where it controls solenoids for air jets, actuators for reject mechanisms, and status indicators on high-speed wrappers, fillers, and cartoners. In automated assembly and testing systems, the DO135 B&R is used to operate clamping cylinders, part pushers, and vision system triggers, ensuring precise sequencing and coordination. It is also widely used in material handling systems to control diverters, stoppers, and conveyor motor contactors.
In the plastics industry, it manages hydraulic valves on injection molding machines and actuators on robots. Furthermore, it is deployed in building automation for controlling ventilation dampers and in test stands for activating various loads and signals. Essentially, the DO135 B&R is the go-to solution for any application within the B&R ecosystem that requires a high-density, reliable, and flexible output module to interface with a large number of DC actuators, making it a workhorse for machine builders and system integrators globally.
DO135 B&R
Related Products
B&R X20 CPU: The central processing unit (e.g., X20CP3584) that executes the control logic for the DO135.
B&R X20 Power Supply: The system power supply unit (e.g., X20PS series) that powers the X20 station.
B&R DI135: The 32-channel Digital Input Module, the complementary input partner to the DO135.
B&R X20 Bus Controller: A communication interface module (e.g., X2X BC) for connecting the I/O station to the network.
B&R Automation Studio: The integrated development environment for configuring, programming, and diagnosing the entire system.
B&R X20 Field Connectors: The removable connector modules (e.g., EP135) used for field wiring.
B&R ACOPOSinverter: A variable frequency drive that can be commanded by the DO135‘s discrete control signals.



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