Description

The B&R 7DO138.70 is a high-density digital output module engineered for the B&R Automation X20 distributed control platform. As a core component of the X20 I/O family, this compact module delivers 16 channels of 24 VDC transistor (sinking) outputs, each rated for up to 0.5 A continuous current. Designed for applications requiring fast switching, long service life, and minimal heat generation, the B&R 7DO138.70 excels in controlling modern industrial loads such as LED indicators, solid-state relays, small solenoid valves, and PLC input circuits.

Unlike relay-based outputs, the B&R 7DO138.70 uses electronic switching with no moving parts, enabling microsecond response times, silent operation, and virtually unlimited switching cycles. It integrates seamlessly into X20 systems via standardized backplane communication, supporting deterministic data exchange with X20 CPU modules like the X20CP1584 or X20CP3585. Each output channel features individual short-circuit protection and status indication via front-panel LEDs, simplifying commissioning and troubleshooting. With its 12.5 mm single-slot footprint, the B&R 7DO138.70 maximizes I/O density while minimizing panel space—a critical advantage in space-constrained machine designs.

B&R 7DO138.70

Technical Specifications

Parameter Name	Parameter Value
Product Model	7DO138.70
Manufacturer	B&R Industrial Automation (a member of ABB Group)
Product Type	Digital Output Module (16-channel sinking transistor)
Output Type	NPN open-collector transistors (sinking)
Output Voltage	24 VDC (external supply required)
Output Current	0.5 A per channel, max 4 A per module
Switching Frequency	Up to 100 Hz (resistive load)
Short-Circuit Protection	Yes – per channel, auto-resetting
Connection Type	2× 16-pin spring-clamp terminal blocks (TB714)
Compatible Baseplates	X20TB06, X20TB12, X20TB52, etc.
Operating Temperature	0°C to +60°C
Dimensions (W×H×D)	12.5 mm × 85 mm × 94.6 mm (1-slot X20 width)

Main Features and Advantages

Ultra-fast, wear-free switching performance:
The B&R 7DO138.70 leverages solid-state transistor technology to achieve switching speeds far exceeding mechanical relays—ideal for high-frequency tasks like pulse-width modulation (PWM) control or rapid solenoid cycling in packaging machines. With no contacts to erode, it offers virtually infinite electrical life under normal operating conditions.

Compact 16-channel density in one slot:
By fitting 16 outputs into a single 12.5 mm X20 slot, the B&R 7DO138.70 dramatically reduces cabinet size and wiring complexity. This high density is especially valuable in modular machines where multiple I/O stations are distributed along a production line.

Robust protection and diagnostics:
Each channel on the B&R 7DO138.70 includes individual short-circuit and overload protection with automatic recovery—preventing cascading failures. Bright red LEDs indicate real-time output status, enabling quick visual verification during startup or maintenance without external test equipment.

Energy-efficient and cool-running:
With low on-state voltage drop (~1.2 V) and no coil power consumption (unlike relays), the B&R 7DO138.70 generates minimal heat, reducing thermal load in sealed enclosures and eliminating the need for forced-air cooling.

Seamless integration with X20 ecosystem:
The module requires no configuration files or jumpers—it is automatically recognized by the X20 system upon insertion. When paired with hot-swap-capable baseplates (e.g., X20TB52), the 7DO138.70 can be replaced live, ensuring maximum uptime in continuous processes.

Optimized for modern 24VDC-centric architectures:
As industrial systems increasingly standardize on 24 VDC for sensors and actuators, the B&R 7DO138.70 aligns perfectly with this trend, providing a cost-effective, reliable interface for the vast majority of digital field devices used today.

B&R 7DO138.70

Application Field

The B&R 7DO138.70 is widely deployed in industries where speed, reliability, and compactness are paramount. In high-speed packaging lines, it drives pneumatic valve manifolds at rates exceeding 50 cycles/minute—tasks that would quickly wear out relay contacts. Its fast response ensures precise timing for product rejection, labeling, and sealing operations.

In robotic assembly cells, the B&R 7DO138.70 controls gripper enable signals, vacuum generators, and status lamps. The absence of contact bounce eliminates false triggers in safety interlocks, while the compact form factor allows I/O modules to be mounted directly on robot bases or end-effectors.

For material handling systems like sortation conveyors or automated guided vehicles (AGVs), the module interfaces with zone controllers, divert gate solenoids, and beacon lights. Its immunity to vibration and shock makes it more reliable than electromechanical alternatives in mobile or dynamic environments.

Even in test and measurement rigs or semiconductor handling equipment, where signal integrity and repeatability are critical, the B&R 7DO138.70 provides clean, jitter-free digital outputs for triggering cameras, sensors, or data acquisition systems. Across all these applications, the B&R 7DO138.70 delivers the blend of performance, longevity, and integration that defines modern industrial automation.

Related Products

7DO135.70: 16-channel relay output module—supports AC/DC loads but slower and less durable than 7DO138.70
7DI140.70: 32-channel digital input module—commonly used alongside 7DO138.70 for complete I/O functionality
X20TB12: Standard 12-pin terminal baseplate—required mounting platform for 7DO138.70
X20CP1585: Compact X20 CPU—ideal controller for systems featuring multiple 7DO138.70 modules
7DO438.70: 8-channel high-current transistor output (2 A)—used when 7DO138.70’s 0.5 A rating is insufficient
X20PS2100: X20 power supply module—provides internal bus power; note that 7DO138.70 requires external 24VDC for loads
7CM211.7: CANopen master module—adds fieldbus expansion to X20 racks containing 7DO138.70
X20DO9321: Safety-rated digital output—complements 7DO138.70 in SIL2/PLd safety circuits