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Description
ABB DI821 3BSE008550R1 S800 Digital Input Module
The ABB DI821 3BSE008550R1, also cataloged as the DI821 Digital Input Module, operates as a dedicated hardware component for 230 V AC/DC discrete signal acquisition within the ABB S800 I/O system. It provides 8 individually isolated input channels with voltage supervision functions, optical isolation barriers, EMC protection, and configurable input filtering.
Hardware Specifications
Parameter
Specification
Model
DI821 3BSE008550R1
Brand
ABB
Product Type
Digital Input Module
Series
S800 I/O
Origin
Sweden
Weight
0.18 kg
Dimensions
45 mm W x 102 mm D x 119 mm H
Operating Temp
0 to +55 deg C
Power Consumption
Typical 2.8 W
Signal Type
Current sinking
Number of Channels
8
Signal Specification
230 V AC, 220 V DC
AC Input Voltage Range
164 to 264 V AC
DC Input Voltage Range
175 to 275 V DC
Input Current
11 mA at 230 V AC; 1.6 mA at 220 V DC
Input Impedance
21 kOhm AC / 134 kOhm DC
Isolation
Individually isolated channels
Digital Filter Time
2, 4, 8, 16 ms selectable
Analog Filter Delay
5 / 28 ms On/Off delay
Input Frequency Range
47 to 63 Hz
Rated Insulation Voltage
250 V
Dielectric Test Voltage
2000 V AC
ModuleBus Current Consumption
+5 V ModuleBus: 50 mA
+24 V ModuleBus Consumption
0 mA
+24 V External Consumption
0 mA
HART Support
No
SOE Function
No
Redundancy Support
No
High Integrity
No
Intrinsic Safety
No
Compatible MTU
TU811, TU813, TU831, TU839, TU851
Keying Code
AC
Protection Class
IP20 according to IEC 60529
Relative Humidity
5 to 95 %, non-condensing
Storage Temperature
-40 to +70 deg C
EMC Compliance
EN 61000-6-4 and EN 61000-6-2
Safety Standards
EN 61010-1, UL 61010-1, EN 61010-2-201, UL 61010-2-201
Marine Certification
ABS, BV, DNV, LR
RoHS Compliance
EU RoHS, UAE RoHS, CN RoHS
ABB S800 I/O Industrial Signal Processing
The ABB DI821 integrates with the S800 I/O architecture through ModuleBus communication and supports high-voltage discrete signal monitoring. Each input channel includes current limiting components, EMC protection components, LED status indication, optical isolation, and a 6 ms analog filter.
Furthermore, the module provides process voltage supervision through dedicated channel monitoring. Channel 1 supervises channels 2 to 4, while channel 8 supervises channels 5 to 7. When the monitored supply voltage disappears, the module activates the corresponding error input and Warning LED indication. The diagnostic information is transferred through the ModuleBus interface.
The DI821 supports ABB industrial control installations requiring dense digital I/O scaling, S800 backplane communication, and firmware-compatible module integration. Its isolated channel design separates field voltage signals from internal electronics to maintain electrical separation between process circuits and control hardware.
Frequently Asked Questions
Q: How does the DI821 provide electrical isolation between input channels? A: The DI821 uses individually isolated input channels. Each channel contains an optical isolation barrier together with EMC protection and current limiting components.
Q: Can the DI821 monitor loss of field supply voltage? A: Yes. Channel 1 and Channel 8 can operate as voltage supervision inputs for separate channel groups. The module reports supervision errors through the ModuleBus interface.
Q: What MTU units are compatible with the DI821 module? A: The DI821 supports TU811, TU813, TU831, TU839, and TU851 MTU configurations with AC keying code.
Field Installation Guidelines
Install the DI821 module only in compatible ABB S800 I/O assemblies with the correct AC keying configuration. Verify that the selected MTU matches the module specification before wiring field circuits.
Connect field wiring according to ABB installation documentation. Maintain separation between high-voltage AC/DC signal wiring and low-level communication or instrumentation wiring to reduce electromagnetic interference.
Use proper grounding methods for cabinet assemblies and ensure cable shields follow the site grounding practice. Confirm input polarity, voltage level, and channel assignment before energizing the module.
Check front LED indicators after installation. Verify Run, Fault, Warning, and channel status indications through the controller diagnostic interface before placing the I/O point into service.
