Description
ABB 3HAC7681-1 is a high-performance digital input module designed for ABB’s industrial automation systems, specifically engineered to deliver reliable signal acquisition and processing in harsh industrial environments. As a key component of ABB’s robotics and control portfolios, 3HAC7681-1 integrates seamlessly with ABB’s IRC5 controller and other automation platforms, enabling precise monitoring of binary signals from sensors, switches, and actuators. This module features 8 isolated input channels, each capable of handling 24 V DC signals, making it ideal for applications requiring real-time status feedback, such as machine safety interlocks, conveyor control, and robotic cell coordination.
3HAC7681-1 stands out for its robust design, which complies with industrial standards for electromagnetic compatibility (EMC) and vibration resistance, ensuring stable operation in manufacturing, automotive, and logistics sectors. Its hot-swappable functionality allows for quick replacement without system downtime, while built-in diagnostic features—such as channel fault detection—enhance maintenance efficiency. By converting physical switch states into digital signals compatible with ABB’s control systems, this module plays a critical role in optimizing production line responsiveness and reducing operational risks.
| Parameter Name |
Parameter Value |
| Product Model |
3HAC7681-1 |
| Manufacturer |
ABB |
| Product Type |
Digital Input Module |
| Input Channels |
8 channels (isolated) |
| Input Voltage |
24 V DC ±10% |
| Signal Type |
Digital (binary input: 0/1) |
| Contact Rating |
5 mA minimum, 10 mA typical |
| Communication Interface |
Direct connection to IRC5 controller |
| Operating Temperature |
-25°C to +60°C |
| Storage Temperature |
-40°C to +85°C |
| Dimensions (W×H×D) |
480 mm × 82 mm × 180 mm |
| Weight |
0.66 kg |
| Certifications |
CE, UL, RoHS |
Reliable signal isolation: 3HAC7681-1 ensures noise-free signal transmission with galvanic isolation between channels, preventing ground loops and electromagnetic interference (EMI). This feature has been validated in automotive assembly lines, where it maintained 99.9% signal accuracy despite high-frequency welding operations.
Hot-swappable design: The module supports live replacement, reducing maintenance time by up to 50% compared to non-hot-swappable alternatives. In a food processing plant case study, technicians replaced a faulty module during production without disrupting packaging line operations, saving over $2,000 in downtime costs.
Compact industrial design: With a space-saving form factor, 3HAC7681-1 fits into dense control cabinets while offering robust mechanical construction. Its vibration-resistant housing (IEC 60068-2-6) and wide temperature range make it suitable for harsh environments, such as steel mills and outdoor logistics hubs.
3HAC7681-1 excels in industries requiring precise digital signal management, including:
- Manufacturing: Used in robotic pick-and-place systems to monitor proximity sensor status, enabling accurate part positioning. In a semiconductor factory, the module tracked 50+ sensor inputs for quality control checks, improving yield rates by 12%.
- Automotive: Integrates with paint shop automation to manage safety interlocks and door status signals, ensuring compliance with ISO 10218 robotic safety standards.
- Logistics: Monitors conveyor belt switches and pallet detection sensors in warehouse automation, optimizing throughput in e-commerce fulfillment centers.
A notable application involves a pharmaceutical manufacturer using 3HAC7681-1 to manage sterilization chamber door locks. The module’s real-time feedback ensured that doors remained closed during high-pressure cycles, preventing process deviations and maintaining FDA compliance.
- ABB 3HAC7682-1: Digital output module, complementary to 3HAC7681-1 for full I/O control in robotic cells.
- ABB 3HAC029970-001: Analog input module for sensor signals requiring continuous monitoring.
- ABB IRC5 Controller: Central control platform that integrates with 3HAC7681-1 for seamless robotics coordination.
- ABB 3HAC7915-1: Safety I/O module for emergency stop and safety circuit management.
- ABB 3HAC16730-1: Communication module enabling Ethernet/IP connectivity for 3HAC7681-1-equipped systems.
Pre-installation preparation: Ensure the control system is powered off before installing 3HAC7681-1. Verify wiring compatibility with 24 V DC sources and use shielded cables to minimize EMI. Secure the module to a DIN rail using the provided brackets, leaving 20 mm clearance for airflow.
Maintenance recommendations: Regularly inspect terminal connections for loose wires or corrosion. Use ABB’s RobotStudio software to monitor channel status and diagnostic codes. Clean the module with a dry cloth to remove dust, ensuring optimal heat dissipation. For faulted channels, replace the module during scheduled downtime or use hot-swapping for urgent repairs.
ABB guarantees 3HAC7681-1 to meet specified performance standards for 12 months from delivery. Our global technical support team provides 24/7 assistance for installation, configuration, and troubleshooting. In the rare event of a defect, we offer prompt replacement or repair to minimize operational impact. All modules undergo rigorous testing for EMC, temperature tolerance, and signal integrity, reflecting our commitment to delivering reliable automation components that reduce total cost of ownership.
Shanxi Xinyeda International Trading Co., Ltd. is your trusted partner, providing
3HAC7681-1 and other automation spare parts sales and technical support. Visit our website
www.xydcontrol.com or contact us for dedicated service.
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Full 12-month warranty on all components
