Description
General Information
表格
| Item | Specification |
|---|---|
| Part Number | DI840, 3BSE020836R1 |
| Manufacturer | ABB |
| Product Family | AC 800M, S800 I/O System |
| Product Type | Digital Input Module |
| Installation | Mounted on S800 I/O backplane, matching terminal base TU840 |
| Power Supply | 24 VDC auxiliary power |
| Lifecycle Status | Obsolete / End‑of‑Life. OEM manufacturing discontinued. Only new‑old‑stock, refurbished and field‑pulled used maintenance spare parts available; no brand‑new factory‑built units can be ordered. |
| ESD Handling Requirement | Digital signal acquisition electronics assembly; anti‑static wrist‑strap and anti‑static workstation required for installation and replacement operations. |
Electrical & Interface Specifications
- Backplane Interface: S800 internal module bus, communicates with AC800M controller via CI840A communication interface.
- Field Terminals: Connected through TU840 terminal base unit.
- Channel Configuration: 16‑channel galvanically isolated digital inputs.
- Input Rating: 24 VDC logic level input signals.
- Input Filter: Hardware input filter for signal debounce.
- Isolation: Galvanic isolation between field side and controller logic side.
- On‑Board Circuitry: Optocoupler isolation circuit, signal filtering circuit, module self‑diagnosis circuit, multi‑channel LED status indicators.
- Power Consumption: Typical 3.5 W.
- Operation Limitation: Cannot operate standalone. Must work with AC800M controller and S800 I/O rack.
- Compatibility Matrix
‑ Compatible System: ABB AC800M, S800 I/O
‑ Matching Terminal Unit: TU840
‑ Hot‑swap: Supported. Module can be plugged / pulled under powered rack condition.
Environmental Specifications
表格
| Item | Value |
|---|---|
| Operating Temperature | ‑40 °C ~ +70 °C inside control cabinet |
| Storage / Transport Temperature | ‑40 °C ~ +85 °C for long‑term spare‑part preservation |
| Relative Humidity | 5 %‑95 % RH, non‑condensing; avoid condensation to prevent circuit corrosion. |
| Compliance Standard | CE certification, complies with industrial EMC requirements. |
| Protection Class | IP20 module body; installed inside protected cabinet. |
| Dimension | Standard S800 module form‑factor |
| Net Weight | Approx. 0.22 kg |
| Vibration Resistance | Complies with IEC 60068‑2‑6 industrial cabinet vibration criteria. |
Main Functions
- DI840 (3BSE020836R1) is 16‑channel digital input module for ABB S800 I/O system under AC800M controller. It collects discrete field status signals and transmits data to the controller.
- Receives 24 VDC digital input signals such as equipment status feedback, interlock switches and limit‑switch signals. All channels adopt galvanic isolation to restrain site electromagnetic interference.
- Hardware filter eliminates signal bounce interference. Front‑panel LED indicators reflect power status, module fault and each input channel status for on‑site inspection and troubleshooting. Built‑in self‑diagnosis reports module abnormal status to AC800M controller.
- Typical field failure symptoms
‑ Field input signal cannot be recognized by controller
‑ Unstable channel reading, signal flicker
‑ Module communication failure with S800 bus
‑ Individual channel burnout caused by field surge voltage
Common root causes: 24 VDC power‑supply anomaly, field over‑voltage surge damaging input channels, poor contact of backplane or terminal base connector, dust and moisture contamination on circuit board, component ageing.
- Pure maintenance‑oriented spare‑part component, only for repair and replacement of existing legacy AC800M installations; not suitable for new‑project engineering deployment.
Typical Applications
- Spare‑part replacement for DI840 digital input module (3BSE020836R1) in S800 I/O rack.
- Troubleshooting scenarios: discrete signal acquisition failure, channel signal unstable, module bus communication breakdown.
- Preventive‑maintenance spare‑part inventory for power, chemical, pulp‑paper sites equipped with AC800M DCS system.
- Hardware refurbishment for decommissioned S800 I/O assemblies.
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