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Description
ABB DI840 3BSE020836R1 Digital Input Module
The ABB DI840 3BSE020836R1, also cataloged as the DI840 Digital Input Module, provides 16 channel 24 VDC current sinking input acquisition for S800 I/O systems with single or redundant configurations.
Hardware Specifications
Parameter
Specification
Model
DI840 3BSE020836R1
Brand
ABB
Product Type
Digital Input Module
Series
S800 I/O
Signal Specification
24 VDC
Number of Channels
16
Signal Type
Current sinking
Input Voltage Range
18 to 30 VDC
Input Current
7 mA at 24 VDC
Input Voltage Range "0"
-30 to +5 V
Input Voltage Range "1"
11 to 30 V
Input Impedance
3.3 kOhm
Isolation
Groupwise isolated from ground
HART Support
No
SOE Function
Yes, event resolution 1 ms
Event Queue Capacity
257 events
Redundancy Support
Yes
High Integrity
No
Intrinsic Safety
No
Filter Time Range
0 to 127 ms selectable
Maximum Field Cable Length
600 m
Event Recording Accuracy
0 ms / +1.3 ms
Rated Insulation Voltage
50 V
Dielectric Test Voltage
500 VAC
Power Dissipation
Typical 2.7 W
ModuleBus Current Consumption
100 mA at +5 V
External 24 VDC Consumption
15 mA + transducer power, maximum 335 mA
Weight
0.15 kg
Dimensions
45 mm W x 102 mm D x 119 mm H
Operating Temp
0 to +55 deg C
ABB S800 I/O Sequence of Event and Signal Processing
The DI840 integrates Sequence of Event (SOE) recording for time-critical digital input monitoring. The module captures input transitions with 1 ms resolution and stores up to 257 event records in the internal event queue.
Furthermore, each input channel contains current limiting components, EMC protection components, an optical isolation barrier, and a dedicated status LED. The transducer power supply is supervised and current limited, with one power output assigned for every two input channels.
The S800 I/O architecture supports backplane bus communication and I/O density scaling within ABB automation platforms. The module provides channel diagnostics, process power supervision, and internal circuit monitoring for system status evaluation.
Backplane Bus Communication and I/O Density Scaling
The DI840 operates as an S800 I/O digital acquisition module with ABB ModuleBus communication. The module supports redundant installation concepts and maintains isolated field signal processing through optical barriers.
Additionally, the module provides front LED diagnostics including Fault, Run, Warning, and channel status indication for channels 1 to 16. These indicators allow direct verification of field signal states and module operating conditions.
The module supports compatibility with TU810, TU812, TU814, TU818, TU830, TU833, TU838, TU842, TU843, and TU852 Module Termination Units.
Frequently Asked Questions
Q: Does the DI840 support Sequence of Event recording? A: Yes. The DI840 provides SOE functionality with 1 ms event resolution and stores up to 257 events in the event queue.
Q: Can the DI840 operate in redundant configurations? A: Yes. The DI840 supports redundant S800 I/O applications and uses compatible ABB Module Termination Units for installation.
Q: What diagnostic functions are available on the DI840? A: The module monitors process power, internal circuitry, and channel conditions. Front LEDs provide Fault, Run, Warning, and channel status indications.
Field Installation Guidelines
Install the DI840 module in an ABB S800 I/O station using the specified compatible Module Termination Unit. Verify correct keying code selection before mechanical installation.
Connect field wiring according to ABB terminal assignment documentation. Keep digital signal cables separated from high voltage power conductors to reduce electromagnetic interference.
Ensure protective grounding, shielding practices, and cabinet environmental requirements comply with IEC installation standards. Confirm ModuleBus connection integrity before system commissioning.
