ABB DI831/DP840 – 16-Channel Digital Input Module | AC800M DCS Platform
Engineering Background
The ABB DI831 and DP840 are high-density digital input modules engineered for the AC800M Distributed Control System (DCS) platform — ABB’s flagship process automation architecture deployed across oil & gas, power generation, pulp & paper, and chemical industries worldwide. These modules serve as the primary field-signal interface layer, converting 24 VDC discrete field signals into structured process data for the AC800M controller.
Product Positioning
Designed for mission-critical process environments where signal integrity, deterministic scan times, and long-term platform continuity are non-negotiable. The DI831/DP840 pair provides a proven, IEC 61131-2 compliant input solution that integrates natively with ABB’s System 800xA engineering environment, enabling seamless tag configuration, diagnostics, and lifecycle management.
Complete Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | DI831 / DP840 |
| Platform | ABB AC800M DCS |
| Module Type | Digital Input (DI) |
| Number of Channels | 16 channels |
| Input Voltage | 24 VDC (nominal) |
| Input Standard | IEC 61131-2 Type 1 / Type 3 |
| Signal Logic Level (ON) | 15–30 VDC |
| Signal Logic Level (OFF) | 0–5 VDC |
| Input Current (per channel) | ≤ 8 mA @ 24 VDC |
| Isolation | Galvanic isolation, channel-to-bus |
| Scan Cycle | Synchronous with AC800M controller cycle |
| Diagnostics | Per-channel open-wire & short-circuit detection |
| Backplane Interface | S800 I/O bus via DP840 baseplate |
| Operating Temperature | 0°C to +55°C |
| Storage Temperature | -40°C to +70°C |
| Humidity | 5–95% RH, non-condensing |
| Protection Class | IP20 |
| Weight | ~950 g (module + baseplate) |
| Certifications | CE, UL, cUL, ATEX (zone 2 with barrier) |
| Engineering Tool | ABB System 800xA / Control Builder M |
Proven Application Environments
- Oil & Gas: Wellhead control panels, compressor station DCS, pipeline SCADA integration
- Power Generation: Turbine control systems, boiler management, switchgear status monitoring
- Chemical & Petrochemical: Reactor interlock systems, valve position feedback, emergency shutdown (ESD) input layers
- Pulp & Paper: Process line DCS, motor status monitoring, conveyor control
- Water & Wastewater: Pump station automation, level switch inputs, SCADA field I/O
- Pharmaceutical: Batch process control, clean-room automation, FDA 21 CFR Part 11 compliant architectures
Engineering Advantages
- Native AC800M Integration: Plug-and-play with S800 I/O bus — no external signal conditioners required
- Per-Channel Diagnostics: Open-wire and short-circuit faults reported in real time to System 800xA operator station
- Galvanic Isolation: Protects controller backplane from field-side transients and ground loops
- Hot-Swap Capable: Module replacement without process shutdown when used with redundant I/O configuration
- Deterministic Scan: Synchronous I/O update aligned with AC800M controller task cycle for precise timing
- Long Product Lifecycle: ABB S800 I/O platform supported through extended lifecycle program — critical for brownfield upgrades
System Architecture & Signal Flow
The DI831 module mounts onto the DP840 baseplate, which connects to the S800 I/O bus via a standard ModuleBus cable. Field wiring terminates at the DP840 terminal block. The AC800M controller polls the DI831 synchronously each task cycle, making channel states available as boolean process values in Control Builder M. Fault conditions are propagated as structured diagnostics to the System 800xA alarm and event server.
Field Devices (24VDC discrete)
↓
DP840 Baseplate (terminal block + bus interface)
↓
DI831 Module (16-ch signal conditioning + isolation)
↓
S800 ModuleBus
↓
AC800M Controller (PM8xx series)
↓
System 800xA Engineering & Operations
Sourcing & Quality Verification
- All units sourced from authorized ABB distribution channels or verified OEM surplus with full traceability
- Pre-shipment inspection: visual, label verification, firmware version check, and functional power-on test
- Original ABB packaging and documentation included where available
- Counterfeit screening performed per IDEA-STD-1010 visual inspection protocol
- Batch traceability records retained for 5 years — available on request for regulated industries
Procurement Process
- Step 1: Submit RFQ via support@konmask.com or WhatsApp +0086 19859288691
- Step 2: Receive quotation with lead time, unit price, and MOQ within 24 hours
- Step 3: Confirm PO — T/T, L/C, or trade assurance accepted
- Step 4: Pre-shipment inspection report issued; DHL / FedEx / sea freight arranged
- Step 5: Tracking number and commercial invoice provided within 48 hours of dispatch
Technical FAQ
Q: Is the DI831 compatible with AC800M PM851, PM856, and PM860 controllers?
A: Yes. The DI831 is compatible with all AC800M PM8xx series controllers via the S800 ModuleBus interface.
Q: Can the DI831 be used in SIL-rated safety loops?
A: The standard DI831 is not SIL-certified. For safety instrumented systems, ABB’s S800 Safety I/O (e.g., DI810 with TÜV certification) should be specified.
Q: What is the difference between DI831 and DP840?
A: The DI831 is the active input module (electronics); the DP840 is the passive baseplate that provides terminal connections and bus interface. Both are required for a complete installation.
Q: Do you provide a warranty?
A: Yes — 12-month warranty against manufacturing defects. DOA units replaced or refunded within 30 days of receipt.
Q: Can you supply in quantity for a plant-wide DCS upgrade?
A: Yes. Contact us for volume pricing and scheduled delivery programs for large-scale projects.
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