Description

The B&R 7DO135.70 is a high-performance digital output module designed for the B&R Automation X20 distributed control platform. As part of the widely adopted X20 I/O family, this module provides 16 independent relay outputs, each capable of switching both AC and DC loads up to 2 A at 250 VAC or 30 VDC. Unlike solid-state outputs, the B&R 7DO135.70 uses electromechanical relays to deliver true galvanic isolation between the control logic and field devices—making it ideal for applications requiring electrical separation, bidirectional switching, or compatibility with legacy equipment.

Positioned as a versatile actuator interface, the B&R 7DO135.70 seamlessly integrates into machine control panels for industries such as packaging, material handling, automotive, and water treatment. It connects directly to X20 baseplates (e.g., X20TB12) via a standardized backplane, enabling deterministic communication with X20 CPU modules like the X20CP1584 or X20CP3585. Each relay features mechanical life exceeding 100,000 operations and includes status LEDs for real-time visual feedback during commissioning and maintenance. With its robust design and universal load compatibility, the B&R 7DO135.70 ensures reliable, long-term operation even in electrically noisy or high-vibration environments.

B&R 7DO135.70

Technical Specifications

Main Features and Advantages

True galvanic isolation for safety and noise immunity:
Each relay in the B&R 7DO135.70 provides complete electrical separation between the internal 24 VDC control circuit and the external load circuit. This prevents ground loops, suppresses EMI from inductive loads (e.g., contactors), and enhances personnel and system safety—critical in mixed-voltage panels or hazardous locations.

Universal AC/DC load compatibility:
Unlike transistor-based outputs limited to DC, the B&R 7DO135.70 switches both AC and DC loads up to 250 VAC/30 VDC. This makes it suitable for driving solenoid valves, pilot lamps, small contactors, motor starters, and even low-power heaters—eliminating the need for external interposing relays.

Independent, fail-safe channel design:
All 16 relays operate independently; a short circuit or overload on one channel does not affect others. The AgSnO₂ contact material resists welding and erosion, ensuring consistent performance even with inductive or capacitive loads. Status LEDs per channel allow instant visual verification of output state during troubleshooting.

Seamless X20 integration with hot-swap support:
The B&R 7DO135.70 auto-configures upon insertion into any compatible X20 baseplate. When used with hot-swap-enabled baseplates (e.g., X20TB52), it can be replaced during operation without powering down the entire rack—minimizing unplanned downtime in continuous processes.

Compact footprint, high reliability:
Despite offering 16 robust relays, the module occupies only one X20 slot (12.5 mm), maximizing panel space efficiency. Its convection-cooled, fanless design ensures silent, maintenance-free operation in dusty or confined enclosures.

Long lifecycle and global support:
As a core component of B&R’s mature X20 platform, the 7DO135.70 benefits from extended availability commitments and extensive documentation—ensuring support for both greenfield projects and brownfield upgrades worldwide.

Application Field

The B&R 7DO135.70 is indispensable in applications demanding flexible, isolated switching of diverse loads. In packaging machinery, it controls pneumatic solenoid valves, reject gates, and stacker actuators—often mixing 24 VDC and 120 VAC devices within the same station. Its relay outputs eliminate compatibility issues that plague solid-state alternatives.

In water and wastewater treatment plants, the B&R 7DO135.70 operates chemical dosing pumps, UV lamp ballasts, and motorized isolation valves. The galvanic isolation protects sensitive PLC circuits from voltage spikes generated by pump motor startups, while the mechanical contacts handle frequent cycling without degradation.

For automotive test benches and factory automation cells, the module drives indicator lights, safety door locks, and small contactors for auxiliary equipment. Its ability to switch both AC control circuits (e.g., 110 VAC coil) and DC signals (e.g., 24 VDC enable) from a single module simplifies wiring and reduces spare parts inventory.

Even in energy management systems or building automation, where legacy HVAC components use AC control voltages, the B&R 7DO135.70 bridges modern X20 controllers with older infrastructure—enabling retrofit projects without full system replacement. Across all these domains, the B&R 7DO135.70 delivers unmatched versatility, safety, and longevity.

B&R 7DO135.70

Related Products

7DO138.70: 16-channel transistor output module (24 VDC only)—faster switching but no AC support, unlike 7DO135.70
7DI140.70: 32-channel digital input module—commonly paired with 7DO135.70 for full I/O control
X20TB12: 12-pin terminal baseplate—standard mounting platform for 7DO135.70
X20CP1585: Compact X20 CPU—ideal controller for systems using multiple 7DO135.70 modules
7DO435.70: 8-channel high-current relay output (5 A)—used when 7DO135.70’s 2 A rating is insufficient
X20PS2100: X20 power supply—provides internal bus power for racks containing 7DO135.70
7CM211.7: CANopen master module—adds fieldbus connectivity to X20 systems featuring 7DO135.70
X20DO9321: 4-channel safety digital output—complements 7DO135.70 in SIL-rated applications