Product Overview
The ABB DO571 (1TNE968902R2202) is a digital output module designed for the S500-eCo series within the PLC-AC500-eCo product family. This module provides 8 relay outputs capable of switching 24VDC/24VAC or 100..240VAC at 2A per channel. Its compact form factor (34 mm width, 135 mm height, 75 mm depth) and lightweight design (0.12 kg net) make it suitable for space-constrained control cabinets. The DO571 carries an IP20 protection rating, ensuring safe operation in indoor industrial environments.
Technical Specifications
- Output Type: 8 relay outputs
- Rated Voltage Range: 24VDC/24VAC or 100..240VAC
- Rated Current: 2A per output
- Protection Rating: IP20
- Dimensions (W x H x D): 34 mm x 135 mm x 75 mm
- Net Weight: 0.12 kg
- Gross Weight: 0.22 kg
- Product ID: 3ABD10094783
These specifications confirm the DO571 as a versatile output module for switching both DC and AC loads up to 240VAC, making it suitable for a wide range of industrial actuators, relays, and indicators.
Industry Applications
The DO571 excels in applications requiring reliable switching of medium-power loads. Common use cases include:
- Conveyor Systems: Controlling motor contactors and solenoid valves in material handling lines.
- Packaging Machinery: Actuating pneumatic cylinders and indicator lamps.
- HVAC Controls: Switching fans, pumps, and damper actuators in building automation.
Compared to solid-state output modules, the relay outputs of the DO571 provide galvanic isolation and handle both AC and DC loads, offering flexibility in mixed-voltage environments.
Installation & Setup Guidance
Mount the DO571 on a standard DIN rail within an IP20-rated enclosure. Ensure adequate clearance for heat dissipation and wiring access. Connect the load power supply to the common terminals, and wire each output to the corresponding device. Use appropriate fusing for each output circuit to protect against overcurrent. Refer to the ABB S500-eCo system manual for detailed wiring diagrams and configuration steps.
Maintenance & Reliability
Relay contacts have a finite mechanical and electrical life. For long-term reliability, inspect the module periodically for signs of contact wear or arcing. Keep the enclosure clean and free of dust to maintain proper cooling. The DO571's compact design and low weight simplify replacement if needed. Always verify load specifications to avoid exceeding the 2A per channel rating.
Compatibility & Integration
The DO571 is designed for the ABB S500-eCo I/O system, which integrates with the PLC-AC500-eCo controller family. It communicates via the S500 backplane bus, requiring no additional configuration for basic operation. The module is compatible with ABB Automation Builder software for system configuration and diagnostics.
Selection Guide & Purchasing Advice
Before purchasing the DO571, verify your system compatibility: the module requires an S500-eCo bus coupler and a compatible AC500-eCo CPU. Confirm that your load voltage and current are within the 24VDC/24VAC or 100..240VAC range and do not exceed 2A per channel. SpareTechPLC stocks the DO571 (1TNE968902R2202) and can advise on availability and lifecycle status.
Troubleshooting & Common Issues
- Output fails to switch: Check load wiring and supply voltage. Verify that the output is enabled in the PLC program.
- Relay chattering: Indicates insufficient voltage or a faulty load. Measure the supply voltage at the module terminals.
- Overheating: Ensure proper ventilation and that total load current does not exceed module ratings.
Frequently Asked Questions
Q1: Can the DO571 switch both AC and DC loads?
Yes, the relay outputs are rated for 24VDC/24VAC or 100..240VAC, allowing switching of both AC and DC loads up to 2A.
Q2: What is the IP rating of the DO571?
The module has an IP20 protection rating, suitable for indoor control cabinets.
Q3: Is the DO571 compatible with older ABB PLC systems?
The DO571 is designed for the S500-eCo series and PLC-AC500-eCo family. It is not directly compatible with older ABB I/O systems without an appropriate bus coupler.
Q4: What are the dimensions of the DO571?
The module measures 34 mm wide, 135 mm high, and 75 mm deep.
Q5: Does the DO571 require external power for the relay coils?
No, the relay coils are powered from the S500 backplane bus. Only the load power needs to be supplied externally.
