ABB-listed MTUs
TU810, TU812, TU814, TU818, TU830, TU833, TU838, TU842, TU843 and TU852. ABB lists keying code CD.
Event-Recording 24 V Input
ABB DI840 is a 16-channel, 24 VDC digital input module for single or redundant S800 I/O applications. It combines current-sinking inputs with supervised, current-limited transducer power. Its Sequence of Events function records transitions at 1 ms resolution and uses a queue of up to 257 events.
Verified SOE, Input & Power Data
01Identity & Signal6 items
Model / article number
DI840 / 3BSE020836R1
Product type / mechanics
Digital input / S800
Number of channels
16
Signal specification
24 VDC
Signal type
Current sinking
Input current
7 mA at 24 VDC
02Input & Event Performance8 items
Stated input range
18 to 30 VDC
Input voltage for state 0
−30 to +5 V
Input voltage for state 1
11 to 30 V
Input impedance
3.3 kΩ
Selectable digital filter
0 to 127 ms
SOE resolution / accuracy
1 ms / 0 ms to +1.3 ms
Event queue
Up to 257 events
Maximum field cable length
600 m (656 yd)
03Redundancy, Supply & Diagnostics8 items
Configuration
Single or redundant
Channel grouping / isolation
One group of 16, groupwise isolated from ground
Sensor power
Built-in current limiting; one output per two inputs
Front LEDs
Fault, Run, Warning and channel 1–16 status
Supervision
Process power and internal circuitry
Status indications
Module Error, Module Warning and Channel error
Power dissipation
2.7 W typical
Current consumption
100 mA at +5 V ModuleBus; 15 mA + transducer power externally, 335 mA maximum
04Environment & Mechanics8 items
HART / SOE / High Integrity
No / Yes / No
Rated insulation / dielectric test
50 V / 500 VAC
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
Dimensions
45 × 119 × 102 mm; 111 mm deep with connector
Weight
0.15 kg
Keying code
CD
Redundant Termination & System Fit
Redundant hardware choices
ABB identifies DI840 for single or redundant use. TU842, TU843 and TU852 are among the listed termination options used in redundant S800 arrangements.
ABB does not designate a direct replacement for DI840. Preserve the 24 V input type, SOE behavior, sensor-power supervision, redundancy arrangement, MTU selection and keying when planning a change.
SOE Applications & Diagnostic Scenarios
Trip and interlock chronology
Collect supported 24 V status transitions when event order matters for post-trip analysis.
Redundant input stations
Use in ABB-documented single or redundant S800 I/O configurations with the corresponding termination and system engineering.
SOE queue pressure
If event sequences appear incomplete, review the event rate, the 257-event queue, the Shutter filter and upstream event handling.
Sensor-power problem
When paired channels lose their field devices, inspect the supervised, current-limited transducer-power output and process-power diagnostics.
SOE & Redundancy Commissioning
01Verify time handling
Confirm that the controller and event-collection path are engineered for the required SOE behavior.
02Set input filtering
Choose the 0–127 ms digital filter without masking the transitions that must be recorded.
03Review Shutter filtering
Apply the event filter only with a clear rule for suppressing unwanted transitions.
04Test redundancy and diagnostics
Prove the selected hardware path, process-power supervision, event order and module/channel alarms.
SOE resolution at the module is only one part of the chronology. Validate the complete event path, filtering and time handling during commissioning.
SOE Module Procurement Support
Failure-context capture
Send the event and redundancy requirements with the RFQ
Include the installed MTU, controller/system version, SOE requirement and whether the station is single or redundant.
- Available test scope and status checks described in the quotation
- Protective packing and a documented DOA reporting path
- Return, warranty and after-sales terms confirmed before shipment
Official ABB Documentation
- ABB Product Details — DI840Article 3BSE020836R1 | 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
ACT401-07FA1783-ETAP1FIC620MDR128BBMXAMO08023AUA0000091254IC695ETM001 -DG140G-G6C3-C50ABB 3AXD0000018345 ACS580X4001606-XLS480E-3CRT1-MD16-1ABB 3BSE028602R1ABB 1KGT033100R0001Allen Bradley 1769-OW165802-00135Allen Bradley 140G-G6C3-C509480/12-08-11SNMP-1000-E1CE58MX400 A/BABB CCU-11 3AUA0000091254ISIS-4-24V AC/DC 370.000BH5911.22/00MF0BMENOS0300VZ3N1317EP-4083D-C-1-Z3IC693CMM311SPSI-WL-RS232-RS485/BT/2DOABB 1SBP260001R1001CPX-CEC-C1
These part numbers are independent purchasing references only. They are not replacements for DI840. Compatibility and stock must be confirmed separately for each item.
DI840 FAQ
What SOE resolution does DI840 provide?
ABB specifies 1 ms resolution and event-recording accuracy from 0 ms to +1.3 ms. The event queue can contain up to 257 events.
Can DI840 be used in a redundant configuration?
Yes. ABB identifies both single and redundant applications. The complete hardware arrangement must use the applicable listed MTU and system configuration.
How is DI840 sensor power arranged?
The module provides supervised, current-limited transducer power with one output serving each pair of input channels.
Which MTUs are listed for DI840?
ABB lists TU810, TU812, TU814, TU818, TU830, TU833, TU838, TU842, TU843 and TU852. The keying code is CD.
What can cause missing DI840 event records?
Check input filtering, Shutter-filter settings, event rate against queue capacity and the upstream controller or historian event path.
What should an RFQ for DI840 include?
Provide the full part number, quantity, destination, required date and machine or system model. Add the installed MTU, SOE requirement and redundancy mode.
RFQ for DI840
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
