DI820 8-Channel Digital Input Module 120V AC S800 | ABB

The Original New ABB DI820 3BSE008512R1 is an 8-channel digital input module for the ABB S800 I/O system, designed to interface high-voltage discrete field signals with ABB control systems including AC 800M controllers and 800xA distributed control systems (DCS). It provides 8 individually galvanically isolated inputs supporting 120V AC (77–130V AC) or 110V DC (75–145V DC) signals, making it ideal for monitoring circuit breaker status, motor control center (MCC) feedback, and other high-voltage switchgear signals in power distribution, substation automation, and industrial process control applications. This module is part of the S800 I/O family—ABB's distributed and modular process I/O system that scales from standard function to high-end features like hot-swap and channel-level diagnostics.

Core Engineering Highlights:
8 individually galvanically isolated digital input channels | 120V AC nominal (77–130V AC operating range) | 110V DC input (75–145V DC range) | 10 mA input current at 120V AC / 2.8 mA at 110V DC | 12 kΩ input impedance (AC) / 39 kΩ (DC) | Individually isolated per channel | Selectable digital filtering: 2, 4, 8, 16 ms | ModuleBus current consumption: 50 mA @ +5V DC | 2.8 W typical power dissipation | Hot-swappable | IP20 protection | 0°C to +55°C operating temperature (extended –40°C to +70°C available)

Key Features:

• Original New ABB DI820 module (3BSE008512R1)

• 8 individually galvanically isolated digital input channels

• Wide AC input range: 77–130V AC (nominal 120V AC)

• Wide DC input range: 75–145V DC (nominal 110V DC)

• Input current: 10 mA at 120V AC

• Selectable digital input filtering: 2, 4, 8, or 16 ms to eliminate contact bounce

• Voltage supervision: Channel 1 supervises channels 2–4; Channel 8 supervises channels 5–7

• LED status indicators: Input status LEDs per channel, warning LED

• Optical isolation per channel for noise immunity and ground loop elimination

• Current limiting and EMC protection per channel

• Hot-swappable – supports module replacement without system shutdown

• ModuleBus communication with high backplane bus velocity

• Compatible with multiple Module Termination Units (MTU): TU811, TU813, TU831, TU839, TU851

• Mechanical keying code: AB

• 2,500V AC isolation voltage (for 1 minute)

• IP20 protection for control cabinet installation

• CE, UL, CSA certified

Applications:

• Power Distribution & Substation Automation – Monitor circuit breaker status, disconnect switch positions, and protective relay outputs in electrical substations and switchgear installations

• Industrial Process Control – Interface with motor control centers (MCCs), variable frequency drives (VFDs), and soft starters providing 120V AC status outputs; monitor equipment run/fault conditions, overload relay trips

• Building Management Systems – Track HVAC equipment status including fan motor contactors, damper actuator positions, and pump starter auxiliary contacts

• Safety & Interlock Systems – Acquire signals from safety relays, emergency stop circuits, and guard door interlocks operating at 120V AC

• Manufacturing and Automotive Production Lines

• Water and Wastewater Treatment Plants

• Oil and Gas, Chemical, and Petrochemical Facilities

Technical Specifications:

System Compatibility:

• Compatible with ABB S800 I/O system architecture

• AC 800M controllers: PM860, PM861, PM862, PM863, PM864, PM865, PM866 series

• ABB 800xA DCS (versions 4.0, 4.1, 5.0, 5.1, 6.0)

• ABB Compact Product Suite and Advant OCS

• Freelance 800F distributed control systems

• Module Termination Units (MTU): TU811, TU813, TU831, TU839, TU851

• ModuleBus cluster communication

• Third-party integration via PROFIBUS DP, PROFINET, or Modbus TCP gateways

Related Products:

• DI810 – 16-channel digital input module, 24V DC

• DI821 – 8-channel digital input module, 220V DC / 230V AC

• DO820 – 8-channel digital output relay module

• TU811 / TU813 / TU831 – Module Termination Units (MTU) for S800 I/O

• TU839 / TU851 – Extended MTUs for S800 I/O

• AI810 – 8-channel analog input module

• CI801 – PROFIBUS communication interface for S800 I/O

PLC ERA is an independent industrial automation distributor supplying genuine Original New products through established global supply channels. All products are factory sealed when applicable and undergo quality inspection prior to shipment. ABB, S800, 800xA, and AC 800M are trademarks of ABB Group.