Product Overview
The ABB DI840 is a 16-channel 24 V d.c. digital input module engineered for single or redundant applications in demanding industrial environments. It delivers reliable signal acquisition with advanced diagnostics and sequence-of-events (SOE) capabilities, making it a cornerstone for modern control systems.
Each input channel integrates current limiting, EMC protection, an input status LED, and an optical isolation barrier—ensuring robust performance and clear visual feedback. The module supports current sinking inputs, offers groupwise isolation from ground, and provides supervised, current-limited transducer power (one output per two channels).
Technical Specifications
The table below summarizes key parameters for the ABB DI840. All values are sourced from the official product data.
| Parameter |
Value |
| Article number |
3BSE020836R1 |
| Type |
Digital Input |
| Number of channels |
16 |
| Input voltage range, "0" |
-30..+5 V |
| Input voltage range, "1" |
11..30 V |
| Input impedance |
3.3 kΩ |
| Input current at 24 V d.c. |
7 mA |
| Isolation |
Groupwise isolated from ground |
| Filter times (digital, selectable) |
0 to 127 ms |
| Event recording resolution |
1 ms |
| Event queue capacity |
Up to 257 events |
| Maximum field cable length |
600 meters (656 yards) |
| Rated insulation voltage |
50 V |
| Dielectric test voltage |
500 V a.c. |
| Power dissipation |
Typ. 2.7 W |
| Current consumption +5 V Modulebus |
100 mA |
| Current consumption +24 V external |
15 mA + transducer power, max 335 mA |
| Operating temperature |
0 to +55 °C (+32 to +131 °F) |
| Storage temperature |
-40 to +70 °C (-40 to +158 °F) |
| Protection class |
IP20 (IEC 60529) |
| Dimensions (W x H x D) |
45 x 119 x 102 mm (1.77" x 4.7" x 4.01") |
| Weight |
0.15 kg (0.33 lbs.) |
Key Features & Benefits
-
16 channels for 24 V d.c. inputs with current sinking
-
Sequence of Events (SOE) with 1 ms resolution and 257-event queue
-
Redundancy support for single or redundant applications
-
Advanced on-board diagnostics with front LEDs and supervision
-
Transducer power distribution with built-in current limiting
-
Groupwise isolation from ground (1 group of 16)
-
Compatible with multiple MTUs (TU810, TU812, TU814, TU818, TU830, TU833, TU838, TU842, TU843, TU852)
Industry Applications
The ABB DI840 excels in applications where high-speed event capture and reliable input monitoring are critical. Typical use cases include:
-
Process control systems in chemical plants, where SOE helps analyze sequence-of-events during alarms or trips.
-
Power generation and distribution, where redundant configurations ensure uninterrupted monitoring.
-
Manufacturing lines requiring precise digital input sensing with groupwise isolation to prevent ground loops.
Its wide input voltage range (18–30 V d.c.) and robust EMC protection make it suitable for harsh industrial environments.
Installation & Setup
Mount the ABB DI840 onto a standard S800 I/O rail. Connect the field wiring to the appropriate MTU (e.g., TU810V1) using the recommended cable lengths (up to 600 meters). Ensure the input voltage stays within the specified range (18–30 V d.c.) to avoid false readings. For redundant applications, configure the module accordingly in the control system software.
Maintenance & Reliability
The DI840 is designed for long-term reliability. Its built-in current limiting protects against overcurrent conditions, and the optical isolation barrier reduces wear on internal components. Periodically inspect the front LEDs for fault or warning indications. Keep the module within operating temperature limits (0 to +55 °C) and avoid condensation (relative humidity 5–95%, non-condensing). The module is CE marked and certified for hazardous locations (C1 Div 2, Zone 2, ATEX) and marine applications (BV, DNV, LR).
Compatibility & Integration
The ABB DI840 integrates seamlessly with ABB's S800 I/O system. It pairs with MTUs TU810, TU812, TU814, TU818, TU830, TU833, TU838, TU842, TU843, and TU852. The keying code is CD, ensuring correct insertion. The module supports both single and redundant configurations, making it versatile for various DCS architectures.
Selection Guide & Purchasing Advice
Before ordering, verify your system's compatibility with the DI840's specifications. Confirm the required number of channels, input voltage, and whether you need SOE functionality. If you are replacing an existing module, check the article number (3BSE020836R1) to ensure exact match. For bulk or project-based purchases, contact PLC Source PRO for availability and pricing. We are a trusted supplier of genuine ABB industrial automation parts.