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Description
ABB DI825 3BSE036373R1 Digital Input Module
The ABB DI825 3BSE036373R1, also cataloged as the DI825 Digital Input Module, provides 125 VDC current sinking signal acquisition for S800 I/O ModuleBus platforms. It processes isolated field input signals through eight channels with selectable digital filtering, event recording, and process voltage supervision functions.
Hardware Specifications
Parameter
Specification
Model
DI825 3BSE036373R1
Brand
ABB
Product Type
Digital Input Module
System Platform
ABB S800 I/O
Signal Specification
125 VDC
Number of Channels
8
Signal Type
Current sinking
HART Support
No
SOE Function
Yes
Redundancy
No
High Integrity
No
Intrinsic Safety
No
Origin
Sweden
Weight
0.14 kg
Dimensions
45 mm W x 119 mm H x 102 mm D; 111 mm D including connector
Operating Temp
0 to +55 deg C
Power Consumption
Maximum 4.9 W
Input Voltage Range State 0
0 to 20 V
Input Voltage Range State 1
71 to 156 V
Input Impedance
41.5 kOhm
Channel Isolation
Individually isolated channels
Digital Filter Time
0 to 100 ms selectable
Maximum Field Cable Length
600 m
Event Recording Accuracy
-0.25 ms to 1.0 ms
Event Recording Resolution
0.4 ms
Rated Insulation Voltage
250 V
Dielectric Test Voltage
2300 VAC Channel to Ground, 1350 VAC Channel to Channel
ModuleBus Current Consumption
Maximum 90 mA at +5 V
External +24 VDC Consumption
0
ABB S800 I/O ModuleBus Signal Processing
The DI825 uses S800 I/O backplane communication for digital process signal transfer and diagnostic reporting. The module provides eight isolated input channels, where each channel includes current limiting components, EMC protection circuits, input status LED indication, and optical isolation barriers.
Furthermore, the module supports Sequence of Event (SOE) recording with millisecond-level event capture performance. Channel 1 can supervise the process voltage for channels 2 to 4, while channel 8 can supervise the process voltage for channels 5 to 7. When supervised voltage disappears, the module generates channel error information and activates the warning indication.
Frequently Asked Questions
Q: Does the DI825 support redundant operation in an S800 I/O configuration? A: No. The DI825 is specified as a non-redundant digital input module. It communicates through the S800 I/O ModuleBus interface without redundant channel operation.
Q: How does the module detect loss of field supply voltage? A: Channel 1 and channel 8 can operate as voltage supervision inputs for grouped channels. If the monitored process voltage disappears, the module reports a channel error and warning status through ModuleBus diagnostics.
Q: What MTU types are compatible with the DI825? A: The DI825 supports TU811, TU813, TU831, TU839, and TU851 Module Termination Units with keying code AB.
Field Installation Guidelines
Install the DI825 in an ABB S800 I/O station using the specified compatible MTU type. Verify the keying code before mounting the module to prevent incorrect hardware installation.
Connect field wiring according to the channel assignment and voltage polarity requirements. Maintain separation between digital input wiring and high-energy power cables to reduce electromagnetic interference.
Use proper grounding methods for cable shields according to site electrical standards. Confirm that the field supply voltage remains within the specified input range before commissioning.
Check front LED indications after installation. Verify Run, Fault, Warning, and channel status indicators during functional testing.
