ABB-listed MTUs
TU810, TU812, TU814, TU830, TU833, TU842, TU843 and TU852. ABB lists keying code CE.
Redundant Current-Sourcing Output
ABB DO840 provides 16 protected high-side outputs for S800 I/O in single or redundant applications. The channels are split into two groups of eight, each with a process-power supervision input. Output drivers are current-limited, protected against over-temperature and supported by inductive-load suppression and optical isolation.
Verified Redundant Output Data
01Identity & Output6 items
Model / article number
DO840 / 3BSE020838R1
Product type / mechanics
Digital output / S800
Number of channels
16
Signal specification
24 VDC (19.2–32 VDC), 0.5 A
Signal type
Current sourcing, current limiting
Configuration
Single or redundant
02Protection & Isolation7 items
Grouping
Two groups of 8
Isolation
Groupwise isolated from ground
Current limiting
Short-circuit-proof current-limited output
Thermal protection
Over-temperature protected high-side drivers
Inductive loads
Integrated inductive-load suppression
Maximum field cable length
600 m (656 yd)
Rated insulation / dielectric test
50 V / 500 VAC
03Supervision & Power7 items
Process-power supervision
One input per output group
Front LEDs
Fault, Run, Warning, OSP and channel 1–16 status
Status indications
Module Error, Module Warning and Channel error
Output Set as Predetermined
Sets configured output states after specified error detection
Power dissipation
4.3 W typical
ModuleBus consumption
130 mA at +5 V; 0 mA at +24 V
External +24 V consumption
200 mA
04Environment & Mechanics8 items
HART / SOE / High Integrity
No / No / No
Operating / storage temperature
0 to +55 °C / −40 to +70 °C
Relative humidity
5 to 95%, non-condensing
Protection / corrosion class
IP20 / ISA-S71.04 G3
Hazardous location
Class I Division 2 cULus, Class I Zone 2 cULus, ATEX Zone 2
Dimensions
45 × 119 × 102 mm; 111 mm deep with connector
Weight
0.15 kg
Keying code
CE
Redundant MTUs & Output Migration
Single or redundant use
ABB explicitly supports both configurations. TU842, TU843 and TU852 are listed termination options used with redundant S800 arrangements.
ABB does not designate a direct replacement for DO840. DO810 is not a direct substitute; redundancy, voltage range, diagnostics, termination, keying and configuration must be checked independently.
Redundant Output Applications & Fault Scenarios
Availability-focused 24 V commands
Use within an ABB-engineered redundant S800 output arrangement where the documented availability and failover behavior are required.
Group process-power monitoring
Supervise the supply feeding each group of eight outputs so a common power loss can be diagnosed separately from individual load faults.
Channel overload or short circuit
Review the connected load, field wiring and driver temperature when protection limits an output or reports a channel error.
Redundancy alarm or switchover concern
Check both module paths, the termination unit, process power, keying and the controller diagnostics before changing hardware.
Redundant Output Commissioning
01Validate the architecture
Confirm the intended single or redundant arrangement and the listed MTU before installation.
02Check group supplies
Verify the 19.2–32 VDC process-power source and supervision input for both channel groups.
03Set predetermined states
Review the output response required when the system detects an applicable error.
04Prove commands and diagnostics
Test each output path, supervision indication and redundancy behavior under an approved procedure.
A redundant module does not make the complete loop redundant by itself. Termination, process power, controller configuration and field circuits must all support the design.
Redundant Output Spare Support
Configuration-aware service
Keep both module paths and MTU data in the request
For urgent replacement work, send the installed article number, MTU, process voltage and redundancy arrangement together.
- Available test scope and visible-condition checks confirmed on the quote
- Protective packing with a clear DOA reporting route
- Return, warranty and after-sales terms agreed before shipment
Official ABB Documentation
- ABB Product Details — DO840Article 3BSE020838R1 | Current ABB product pageView ABB product page
- ABB Ability™ System 800xA® 7.0 Product Catalog7PAA015938 Rev A | S800 I/O module and MTU overviewOpen ABB catalog
Multi-brand Spare Parts Also Requested
M0320TM172PDG28RABB 3BSE003644R1 PM153424 512 03S17-58 1131752-82GE Fanuc IC695ETM001-DG1000:1000-R0-3R-0-11000-R0-3R-0-1ABB 2CDG110137R0011ABB CCU-11ISIS-4-24V1715-TADIF16X20AT2311S3UM 100/110VACB&R X20AT2311ABB 1TNE968900R1200 PM564-RMTL F10144A751806-G011783-BMS10CGNMW631A / MW631 / BN634A362G51SEL-G-3-AC-60BL.60BL.60BL-2S3UMANPV0502ADNABB 1SAP220500R0001 DC551-CS31ABB 1SAP250100R0001ABB 1SAP224200R0001PS4-341-MM1CC-TDIL01 51308386-175FTT16R0-G02Z21756-OBV8SIC693CPU331Y
These part numbers are independent purchasing references only. They are not replacements for DO840. Compatibility and stock must be confirmed separately for each item.
DO840 FAQ
Can DO840 be used in a redundant output configuration?
Yes. ABB identifies both single and redundant applications. The termination unit and complete System 800xA configuration must match the engineered arrangement.
What output range does DO840 use?
ABB specifies 24 VDC, with a 19.2–32 VDC range and a maximum continuous output current of 0.5 A per channel.
Which MTUs are listed for DO840?
ABB lists TU810, TU812, TU814, TU830, TU833, TU842, TU843 and TU852. The keying code is CE.
How does DO840 report process-power loss?
Each eight-channel group has one process-power supervision input, with module, warning and channel status indications available.
What protection does DO840 provide for field loads?
The high-side drivers are current-limited, short-circuit-proof and protected against over-temperature, with inductive-load suppression.
What should an RFQ for DO840 include?
Provide the full part number, quantity, destination, required date and machine or system model. Add the MTU, redundancy mode, field voltage and load information.
RFQ for DO840
For a faster technical and commercial check, send the installed-part details together with the required date.
Email Miya Zheng- Part Number
- Quantity
- Destination
- Required Date
- Machine / System Model
