Application Scenarios
At a wastewater treatment plant in Toronto,operators struggled with intermittent signal loss from level sensors due to electrical noise and aging I/O modules.After upgrading to the ABB DI821 3BSE00B550R1 across their AC500 control system,signal integrity improved dramatically.The module’s robust filtering and galvanic isolation(500V AC)effectively suppressed electrical interference from pumps and motors.During a heavy storm event,all 16 inputs on multiple ABB DI821 3BSE00B550R1 modules accurately reported sump levels in real time,enabling automatic pump sequencing that prevented overflow.The reliability of the ABB DI821 3BSE00B550R1 proved essential in maintaining environmental compliance and operational resilience.
Parameter
Main Parameters Value/Description
Product Model ABB DI821 3BSE00B550R1
Manufacturer ABB
Product Category Digital Input Module
Series AC500/S500
Number of Channels 16(24V DC Inputs)
Input Voltage 24 V DC(19.2–30 V)
Input Type PNP(sourcing),compatible with dry contacts and active sensors
On-State Voltage≥15 V
On-State Current 4.5 mA(typical)
Response Time Adjustable:0.2 ms/1 ms/5 ms/20 ms per group
Isolation Voltage 500 V AC(channel-to-channel and channel-to-ground)
Backplane Interface S500 I/O Bus(connects to CPU and power modules)
Operating Temperature-25°C to+60°C
Storage Temperature-40°C to+85°C
Installation Method 35 mm DIN Rail(EN 60715)
Protection Rating IP20(module),IP40(with optional cover)
LED Indication Per-channel ON/OFF status and module health
MTBF>100,000 hours(typical)
Technical Principles and Innovative Values
Innovation Point 1:The ABB DI821 3BSE00B550R1 features configurable response times(0.2/1/5/20 ms),allowing users to optimize noise immunity and signal speed based on application needs—critical for filtering contact bounce or capturing fast pulses.
Innovation Point 2:With 500V AC galvanic isolation,the module protects the PLC backplane from voltage transients,ground loops,and surge events,enhancing system reliability in electrically noisy environments.
Innovation Point 3:Designed for seamless integration into the AC500/S500 ecosystem,the ABB DI821 3BSE00B550R1 supports hot backup,redundancy,and scalable I/O expansion,enabling flexible and future-proof control architectures.
Innovation Point 4:The module includes per-channel LED indicators,providing immediate visual feedback for diagnostics and commissioning,reducing troubleshooting time during installation and maintenance.
Application Cases and Industry Value
In a beverage bottling line in Italy,the ABB DI821 3BSE00B550R1 was deployed to monitor bottle presence,cap detection,and conveyor status across multiple stations.Previously,signal jitter caused miscounts and line stoppages.The ABB DI821 3BSE00B550R1’s stable input filtering and fast response time ensured accurate detection at speeds exceeding 600 bottles per minute.Over six months,the line’s OEE(Overall Equipment Effectiveness)increased by 18%,directly attributed to the improved signal reliability from the ABB DI821 3BSE00B550R1 modules.
At a wind farm SCADA system in Scotland,the ABB DI821 3BSE00B550R1 monitors status signals from turbine breakers,door interlocks,and fire detection systems.Installed in remote,high-altitude substations,the module’s wide operating temperature range(-25°C to+60°C)and resistance to humidity and vibration ensured uninterrupted monitoring.During a lightning storm,multiple units withstood voltage surges without failure,maintaining critical safety monitoring.Operators reported zero input module failures over a 4-year period,highlighting the ABB DI821 3BSE00B550R1’s durability in extreme conditions.
Related Product Combination Solutions
ABB DO811 3BSE00B548R1:16-channel digital output module,pairs with ABB DI821 3BSE00B550R1 for balanced I/O expansion.
ABB AI810 3BSE00B552R1:8-channel analog input module for mixed signal applications.
ABB AC500 CPU 3BSE00B510R1:Central processing unit that hosts the ABB DI821 3BSE00B550R1 in a full PLC system.
ABB PS501 3BSE00B500R1:Power supply module for S500 series,provides 24V DC to ABB DI821 3BSE00B550R1.
ABB CI531 3BSE00B531R1:Communication interface module(Profibus,Modbus,etc.)for SCADA integration.
ABB CP600 3BSE018510R1:Compact controller that supports ABB DI821 3BSE00B550R1 for smaller applications.
ABB DI822 3BSE00B551R1:32-channel version for high-density digital input needs.
ABB S500 Baseplate 3BSE00B505R1:DIN rail mounting base with integrated bus connection.
Installation,Maintenance,and Full-Cycle Support
The ABB DI821 3BSE00B550R1 is designed for quick and error-free installation.Simply mount on a 35 mm DIN rail,connect to the S500 backplane,and wire field devices to the spring-clamp terminals.The module is automatically recognized by the AC500 CPU via the Control Builder M engineering tool,minimizing configuration time.Per-channel LEDs provide real-time status,enabling fast verification during commissioning and troubleshooting.
Maintenance is minimal—periodic visual inspection and cleaning are recommended.The module’s solid-state design and conformal coating(optional)ensure long-term reliability in harsh environments.ABB offers comprehensive lifecycle support,including firmware updates,technical documentation,and global spare parts availability.With proven performance across industries,the ABB DI821 3BSE00B550R1 is a trusted component for building robust,scalable automation systems.
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For all items, modules, and cards sold by our company, if any quality problems occur during normal use within the warranty period, we will provide free replacements without any excuse or delay. 2. For non-discontinued materials and equipment that are out of the warranty period, we only charge the cost of relevant accessories for quality problems. 3. For discontinued materials and equipment, we provide alternative models and equipment replacement process services. 4. For the materials and equipment purchased by customers, we offer lifetime free system software upgrades and provide relevant technical documents for free. 5. We regularly follow up on the usage of the materials purchased by customers and promptly solve any problems. 6. Our company’s hotline provides 24-hour service, and we will respond to customers’ questions within 1 hour. 7. For any other matters not covered, our company adheres to the attitude of “thoughtful service and full responsibility” and solves problems from the customer’s perspective in a practical way. With a serious and rigorous corporate style, we wholeheartedly serve every customer. The company mainly imports PLC modules, programmable controllers, servo control systems and DCS spare parts, such as: ABB, AB (Rockwell), GE (General Electric), Bentley, Honeywell, Emerson, Motorola, Invensys, Westinghouse, etc. The company has established close cooperative relations with many world-renowned PLC and DCS product maintenance service providers, and can directly purchase from abroad, providing equipment and spare parts from different countries and manufacturers. We supply directly from abroad, without middlemen, reducing the cost of use. There is really no middleman who can make a price difference! ! 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