Description
ABB DO880
- Technical Specifications:
- Output Voltage: 24 V DC (19.2–32 V DC)
- Channels: 16, one isolated group (group isolated from backplane)
- Output Type: High-side MOSFET, current sourcing (PNP)
- Max Continuous Current: 0.5 A per channel; total 8 A max per module (thermal derating applies)
- On-State Drop: <0.5 V typical
- Short-Circuit Protection: Current-limited; fault-tolerant design (Fault Tolerance = 1 per IEC 61508)
- Loop Supervision: Open-load and short-circuit detection; configurable loop resistance threshold (typ. 50 Ω – 2 kΩ depending on mode)
- Redundancy: Supports 1oo2 redundant pairing with second DO880
- Safety Integrity: SIL3 per IEC 61508; Category 4 per EN 954-1 / EN ISO 13849-1
- OSP: Degraded mode for normally energized (ND) channels — can force safe state on error
- Isolation: 500 V AC dielectric test, 50 V rated between field side and ModuleBus
- Power Dissipation: Typ. 5.6 W (16 ch × 0.5 A × 24 V — actual lower due to drop; module heating accounted)
- ModuleBus Current: +5 V typ. 45 mA; +24 V ext. typ. 10 mA (diag)
- Max Field Cable Length: 600 m
- Operating Temp.: 0 °C to +55 °C (compact MTU vertical: max +40 °C)
- Compatible MTUs: TU810V1, TU812V1, TU814V1, TU830V1, TU833, TU842, TU843, TU852
- Keying Code: FE
- Certifications: CE, UL 61010, ATEX / IECEx Zone 2, cULus, SIL3, marine
- Functional Features:
- SIL3 certified for final element control in SIS (ESD solenoid, fire pump start, etc.)
- Continuous loop monitoring detects broken wire or shorted solenoid coil
- Supports redundant output pairing — if one module fails the other maintains safe control per voting architecture
- Diagnostics readable via controller — channel error, module warning, process voltage loss
- Can be configured for normally de-energized (ND) or normally energized (NE) safety logic
- Application Scenarios:
- SIL3 ESD solenoid valve actuation in process shutdown loops
- Safety alarm horn / beacon activation in SIS
- Turbine protective trip-valve control (redundant DO880 pair)
- Any SIF requiring SIL3-rated digital output with diagnostics
- Material & Structure / Working Principle: Same S800 transistor-output architecture as DO810 but with duplicated sensing paths, self-test routines, and loop supervision per IEC 61508.
- Installation Requirements:
- Insert into S800 MTU with key code FE; ensure tight seating
- Connect 24 V DC process supply to module process voltage terminals; verify polarity
- For redundant configuration, wire field device per ABB 1oo2 wiring diagram (typically parallel outputs with OR-ing diodes or series with test capability — follow SRS)
- Configure loop supervision thresholds to match solenoid coil resistance (e.g., 20 Ω typical — set min/max acceptable loop R)
- Download configuration from 800xA Engineering Workbench with SIL parameters
- Precautions:
- Safety Lifecycle: DO880 is part of SIS — must be specified, designed, installed, and maintained per SRS (Safety Requirements Specification) and IEC 61511.
- Loop Resistance Setting: Incorrect open-load threshold may cause spurious faults — measure cold solenoid resistance and set limits with margin (e.g., ±30 %).
- Redundancy Wiring: Improper diode / wiring in redundant pair invalidates SIL claim — use ABB-approved redundant wiring practice.
- Proof Test: Include DO880 output function test (forced trip test) in SIS proof-test procedure at interval defined in SRS.
- Do NOT bypass loop supervision — defeating diagnostics removes SIL capability.
