ABB DO910
ABB DO910 - Image 2

ABB DO910

Product Brief 

The DO910 is a digital output module for ABB S800 distributed I/O systems, providing 24 V DC solid-state sourcing (PNP-type) transistor outputs for direct control of 24 V DC field actuators — solenoid valves, indicator beacons, contactor coils, and interposing relays. Outputs are short-circuit protected, current-limited, and grouped with process voltage supervision. The module mounts on S800 Terminal Units (MTU) and communicates with AC 800M / System 800xA / Freelance controllers via the ModuleBus. It supports hot-swap insertion when used with a hot-swap-enabled MTU. In S900 Ex I/O context (DO910S), the module provides 4 intrinsically safe outputs for driving Ex i solenoid valves in hazardous areas via a galvanically isolated Ex i terminal assembly.

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Category: SKU: ABB DO910

Description

ABB DO910

Technical Specifications

Parameter Value / Description
Signal Type​ 24 V DC transistor, high-side (current sourcing / PNP)
Number of Channels​ 8 (S800 DO910 typical) — 4 (S900 DO910S Ex i variant)
Output Voltage Range​ 12–32 V DC (nominal 24 V DC process supply UP)
Max Continuous Current​ 0.5 A per channel (S800); S900 Ex i version limited to IS energy constraints (typ. 40 mA Ex i)
Total Module Load​ ≤4 A (S800, 8-ch version, group thermal limit applies)
Output Type​ Non-latching, high-side MOSFET with free-wheeling diode for inductive load suppression
Short-Circuit Protection​ Current-limited; auto-recovery after fault clears (S800 version)
Isolation​ Group-wise isolated from ModuleBus (500 V a.c. dielectric test, 50 V rated insulation); channel-to-channel NOT isolated within group
Process Voltage Supervision​ One supervision input per group — module warning/fault if UP absent
On-State Voltage Drop​ <0.5 V @ 0.5 A typical
Turn-On / Turn-Off Delay​ <50 µs / <200 µs
Leakage Current (OFF)​ <0.5 mA
Max Field Cable Length​ 600 m shielded (S800); S900 Ex i follows IS cable parameter limits
Inductive Load Handling​ Internal free-wheeling diode; for large inductance verify energy within spec
Diagnostics​ Per-channel yellow LED (ON = output active); module Run / Fault / Warning / OSP LEDs
OSP (Output Set to Predefined)​ Configurable — Off / Last State / On upon comm loss or module fault (S800 version)
Power Dissipation​ Typ. 1.8–2.1 W (fully loaded 8-ch version)
ModuleBus Current Draw​ +5 V: typ. 80 mA; +24 V ext. (process): drawn from external UP terminal, not from backplane
Operating Temperature​ 0 °C to +55 °C (for vertical mount in compact MTU max +40 °C); storage –40 °C to +70 °C
Humidity​ 5–95 % RH, non-condensing
Enclosure Protection​ IP20 (module in cabinet); S900 front cover IP54/65 per variant
Mounting​ 35 mm DIN rail via Terminal Unit (TU810 / TU812 / TU814 / TU830 / TU833 / TU842 / TU843 / TU852)
​ 45 mm (W) × 119 mm (H) × 102 mm (D); weight ≈0.18 kg
Certifications​ CE, UL 61010-1, cULus, ATEX / IECEx Zone 2 (); ATEX / IECEx Zone 1 with S900 IS barrier (DO910S)
Conformal Coating​ G3 per ISA-S71.04 standard on I/O modules

Functional Features

  • High-Side Sourcing Outputs:​ Directly switches 24 V DC to field loads — simplifies wiring for PNP (sourcing) sensors/valves common in European practice.
  • Short-Circuit & Over-Temp Protection:​ Each channel current-limited; module survives sustained short to ground or 30 V DC; auto-recovers when fault removed.
  • Process Voltage Supervision:​ Detects loss of 24 V DC field supply (UP) and reports diagnostic to controller — prevents silent output failure.
  • OSP (Safe State on Error):​ Configurable output behavior on communication loss, module fault, or watchdog timeout — essential for fail-safe process designs.
  • Hot-Swap Capability:​ Module can be inserted/removed with MTU powered when station configured for hot-swap — minimizes downtime during maintenance.
  • Status LEDs:​ Individual channel + module-level Run / Fault / Warning / OSP for rapid local troubleshooting without laptop.
  • Inductive Load Suppression:​ Built-in free-wheeling path protects MOSFET from back-EMF of solenoid/relay coils.
  • (S900 DO910S only):Intrinsically safe Ex i outputs with channel-to-channel isolation, line fault detection (open/short), suitable for Zone 1/Division 1 installation with approved IS barrier.

Application Scenarios

  • Process Plant Final Element Control:​ 24 V DC solenoid valves for open/close or modulating (on/off) service — cooling water dump valve, steam header vent, sample tap actuator.
  • Auxiliary Equipment Control:​ Start command to 24 V DC interposing relay for motor starter coil, lube oil pump contactor, or fan starter.
  • Visual Annunciation:​ 24 V DC stack lights, beacon flashers, local alarm horns in control rooms or field kiosks.
  • Packaging / Converting Machinery:​ Clamp/unclamp solenoid, part-present reject gate actuator controlled via AC500 + remote I/O.
  • ( DO910S):Driving intrinsically safe solenoid valves on shutdown skids or analyzers located in classified (Zone 1/Zone 0) areas — fire & gas, ESD final elements in hazardous zones.

Material Composition & Structural Characteristics

  • Housing:​ Flame-retardant polycarbonate/ABS blend (gray), UL 94 V-0 rated, with transparent polycarbonate status window.
  • PCB:​ Industrial-grade FR4 with G3 conformal coating for resistance to corrosive atmospheres (H₂S, SO₂, NaCl).
  • Terminals:​ Field wiring terminates on Terminal Unit (TU) — screw or spring-cage type available on TU; module itself engages TU via gold-plated backplane edge connector.
  • Keying / Coding:​ Physical key on module bottom engages coded slots on MTU — prevents insertion of wrong module type into incompatible MTU.
  • Heat Dissipation:​ Internal copper plane spreads heat from MOSFETs; adequate cabinet ventilation required especially when multiple outputs heavily loaded.

Working Principle

The DO910 receives a digital output image bit from the controller via the ModuleBus cyclic data exchange. An opto-isolator triggers a P-channel MOSFET high-side driver which connects the output terminal to the externally supplied process voltage (UP = +24 V DC). When the image bit is ‘1’, the MOSFET turns ON, supplying 24 V DC to the field load; when ‘0’, it turns OFF. Each channel monitors its own current — if current exceeds the short-circuit limit, the driver is throttled or switched off and a diagnostic flag is set. On communication loss or internal fault, outputs assume the pre-configured OSP state (OFF / ON / Last). Process voltage on the UP terminal is continuously monitored; disappearance triggers a Warning diagnostic.

Installation Requirements

  1. Mount the Terminal Unit (TU):​ Secure the appropriate MTU (e.g., TU810, TU830) on a 35 mm DIN rail inside the cabinet; ensure proper earth bonding of the rail/chassis.
  2. Insert Module:​ Align DO910 with MTU guide rails, press in until it seats and the retaining screw can be engaged. Verify key-code matches MTU setting (typically code AA for 24 V DC DO modules).
  3. Wire Process Supply:​ Connect +24 V DC (UP) to the process voltage terminal on TU, and 0 V (ZP) to the common return terminal. Fuse the UP supply appropriately (typically 10 A fast-blow max per TU common terminal rating).
  4. Wire Field Devices:​ Connect load between the output terminal (O0…O7) and 0 V return (ZP). For sourcing (PNP) outputs, the load completes the circuit to 0 V.
  5. Shield & Ground:​ Use shielded twisted-pair for long runs; connect shield to cabinet earth at one end only (preferably cabinet end).
  6. Configure in Engineering Software:​ In Control Builder / Freelance Engineering Workbench, add DO910 to I/O configuration, set OSP behavior, process voltage supervision enable/disable, and download to controller.
  7. Power-Up & Test:​ Energize 24 V DC supply, verify Run LED green, test each output via force function — confirm field device operates and channel LED illuminates.

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