Product Overview
The ABB DI890 Digital Input Module delivers 8 intrinsically safe channels for process equipment in hazardous areas. Each channel is galvanically isolated from the power supply, ground, and other channels. This design eliminates the need for additional external isolation devices, simplifying installation and reducing cost.
Intrinsically safe proximity sensors or volt-free contacts can be powered and monitored by any channel. The DI890 supports NAMUR-standard sensors and detects line faults without external components. For volt-free contacts, external resistors connected in series and parallel enable field circuit state sensing.
All eight channels are individually isolated from the ModuleBus and power supply. Power to input stages is converted from the 24 V supply connections. Three front LEDs indicate module status: Fault (Red), Run (Green), and Warning (Yellow).
Part of the ABB S800 series, the DI890 works with TU890 and TU891 compact MTUs for two-wire process connections. TU890 is for Ex applications; TU891 for non-Ex applications.
Technical Specifications
| Parameter |
Value |
| Article Number |
3BSC690073R1 |
| Type |
Digital Input |
| Signal Specification |
NAMUR input level |
| Number of Channels |
8 |
| Signal Type |
Proximity sensor (NAMUR) or Voltage free contact |
| Intrinsic Safety |
Yes |
| Mechanics |
S800 |
| Isolation |
Individually isolated, channel-to-channel and to circuit common ground |
| Filter Times (digital, selectable) |
2, 4, 8, 16 ms; analog filter 1 ms |
| Current Limiting |
Built in current limited sensor power |
| Rated Insulation Voltage |
50 V |
| Dielectric Test Voltage |
500 V a.c. |
| Power Dissipation |
1.4 W |
| Current Consumption +5 V Modulebus |
Typ. 120 mA, Max. <150 mA |
| Current Consumption +24 V external |
Typ. 50 mA, Max. <70 mA |
| Front LEDs |
F(ault), R(un), W(arning), Channel 1-8 status and F(ault) |
| Supervision |
Internal process supply, Loop supervision |
| CE Mark |
Yes |
| Electrical Safety |
EN 61010-1, EN 61010-2-201 |
| Hazardous Location |
ATEX/IECEx Zone 2 with interface to Zone 0, cFMus C1, Div 2/Zone 2 with interface to C1, C2, C3 Div 1/Zone 0 |
| Marine Certification |
ABS, BV, DNV, LR |
| Temperature, Operating |
0 to +55 °C (+32 to +131 °F) |
| Temperature, Storage |
-40 to +70 °C (-40 to +158 °F) |
| Pollution Degree |
Degree 2, IEC 60664-1 |
| Corrosion Protection |
ISA-S71.04: G3 |
| Relative Humidity |
5 to 95 %, non-condensing |
| Max Ambient Temperature |
55 °C (131 °F), for vertical mounting in compact MTU 40 °C (104 °F) |
| Protection Class |
IP20 according to IEC 60529 |
| Mechanical Operating Conditions |
IEC/EN 61131-2 |
| EMC |
EN 61000-6-4, EN 61000-6-2 |
| Overvoltage Categories |
IEC/EN 60664-1, EN 50178 |
| Equipment Class |
Class I according to IEC 61140; (earth protected) |
| RoHS Compliance |
DIRECTIVE/2011/65/EU (EN 50581:2012) |
| WEEE Compliance |
DIRECTIVE/2012/19/EU |
| Compatibility |
Use with MTU TU890, TU891 |
| Keying Code |
AA |
| Width |
45 mm (1.77”) |
| Depth |
102 mm (4.01”), 111 mm (4.37”) including connector |
| Height |
119 mm (4.7”) |
| Weight |
0.2 kg (0.44 lbs.) |
Key Features & Benefits
- 8 channels with process voltage supervision
- Output status indicators
- OSP sets outputs to predetermined state upon error detection
- Short-circuit protection to ground and 30 V
- Over-voltage and over-temperature protection
- Intrinsic Safety support
- NAMUR inputs
- G3 compliant
Industry Applications
In chemical plants, the DI890 monitors NAMUR proximity sensors in Zone 1 areas, ensuring safe operation without external barriers. Its intrinsic safety simplifies design and reduces panel space.
In oil and gas facilities, the DI890 handles volt-free contacts from limit switches and relays. The galvanic isolation prevents ground loops and improves signal integrity, even in electrically noisy environments.
For marine applications, the DI890 meets ABS, BV, DNV, and LR certifications, making it suitable for offshore platforms and shipboard control systems. Its G3 corrosion protection ensures reliability in harsh, humid conditions.
Installation & Setup Guidance
Mount the DI890 on an S800 standard DIN rail or compact MTU (TU890/TU891). For vertical mounting in a compact MTU, the maximum ambient temperature is 40 °C (104 °F). Ensure proper keying code AA alignment to avoid incorrect insertion.
Wire each channel to the field device using the two-wire connection provided by the MTU. For NAMUR sensors, no external resistors are needed. For volt-free contacts, add series and parallel resistors to enable line fault detection. Connect the 24 V supply to the module's power terminals, and verify the +5 V Modulebus connection to the backplane.
After wiring, power up the module and check the front LEDs: Run (Green) indicates normal operation; Fault (Red) indicates a module error; Warning (Yellow) indicates a process or line fault. Use the selectable digital filter times (2, 4, 8, 16 ms) to match your application's noise environment.
Maintenance & Reliability
The DI890 requires minimal maintenance. Periodically inspect the module for dust accumulation and ensure the IP20 enclosure is not compromised. Check that all terminal connections remain tight, especially in high-vibration environments.
Monitor the front LEDs for any warning or fault conditions. If a line fault is detected, verify the field wiring and sensor condition. The built-in short-circuit protection to ground and 30 V helps prevent damage from accidental shorts. Over-voltage and over-temperature protection extend the module's service life.
Given the G3 corrosion protection, the DI890 is suitable for industrial atmospheres with moderate chemical exposure. Store the module within -40 to +70 °C when not in use, and operate within 0 to +55 °C for optimal performance.
Compatibility & Integration
The DI890 is part of the ABB S800 series and is designed for use with ABB's distributed control systems (DCS) and programmable logic controllers (PLC). It connects to the ModuleBus and uses the TU890 (Ex) or TU891 (non-Ex) compact MTU for field wiring.
This module supports NAMUR input levels, making it compatible with a wide range of intrinsically safe proximity sensors. It does not support HART, SOE, redundancy, or high integrity configurations, so plan your system accordingly.
Selection Guide & Purchasing Advice
Before purchasing, verify that the DI890 matches your system's mechanical and electrical requirements. Confirm the keying code (AA) and ensure your backplane supports S800 modules. Choose the appropriate MTU: TU890 for hazardous areas, TU891 for non-hazardous areas.
Check the input signal type (NAMUR or volt-free contact) and ensure your sensors meet the NAMUR standard. If using volt-free contacts, plan for external resistors to enable line fault detection. Also, consider the ambient temperature limits, especially if mounting vertically in a compact MTU.
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