Product Overview
The ABB DI820 is a high-performance digital input module engineered for demanding industrial automation environments. With 8 individually isolated channels, the DI820 accepts both AC and DC signals, making it a versatile choice for monitoring field devices such as limit switches, pushbuttons, and proximity sensors. Its robust design includes EMC protection, optical isolation, and current limiting components to ensure reliable operation in electrically noisy plants.
Key to the DI820's functionality is its voltage supervision capability. Channel 1 can supervise channels 2–4, and channel 8 can supervise channels 5–7. If the field power to these groups fails, the module activates error inputs and illuminates a warning LED, allowing operators to quickly detect power loss and minimize downtime.
Technical Specifications
The following table summarizes the critical specifications of the ABB DI820, ensuring you have the exact data needed for system design and integration.
| Parameter |
Value |
| Article Number |
3BSE008512R1 |
| Type |
Digital Input |
| Signal Specification |
120 V AC / 110 V DC |
| Number of Channels |
8 |
| Signal Type |
Current Sinking |
| Input Voltage Range ("0") |
0..30 V AC, 0..20 V DC |
| Input Voltage Range ("1") |
77..130 V AC, 75..145 V DC |
| Input Impedance |
12 kΩ (AC) / 39 kΩ (DC) |
| Isolation |
Individually isolated channels |
| Filter Times (digital, selectable) |
2, 4, 8, 16 ms |
| Input Frequency Range |
47..63 Hz |
| Analog Filter On/Off Delay |
5 / 18 ms |
| Current Limiting |
Sensor power can be current limited by the MTU |
| Maximum Field Cable Length |
200 m (219 yd) for AC, 600 m (656 yd) for DC |
| Rated Insulation Voltage |
250 V |
| Dielectric Test Voltage |
2000 V AC |
| Power Dissipation |
Typ. 2.8 W |
| Current Consumption +5 V Modulebus |
50 mA |
| Current Consumption +24 V Modulebus |
0 |
| Current Consumption +24 V External |
0 |
| Width |
45 mm (1.77") |
| Depth |
102 mm (4.01"), 111 mm (4.37") incl. connector |
| Height |
119 mm (4.7") |
| Weight |
0.18 kg (0.4 lbs.) |
These specifications ensure the DI820 integrates seamlessly into S800 I/O systems, providing accurate and reliable digital input acquisition.
Industry Applications
The ABB DI820 is ideal for applications requiring robust digital input monitoring with high immunity to electrical noise. Typical use cases include:
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Process Control: Monitoring limit switches and valve position feedback in chemical or pharmaceutical plants.
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Material Handling: Detecting presence of parts on conveyors using photoelectric or inductive sensors.
-
Power Distribution: Supervising auxiliary contacts in switchgear to ensure proper breaker status.
Thanks to its voltage supervision feature, the DI820 is especially valuable in safety-critical processes where loss of field power could lead to hazardous conditions. Early warning via the ModuleBus allows control systems to initiate safe shutdown procedures.
Installation & Setup
Installing the ABB DI820 is straightforward when following the S800 series guidelines. Mount the module on a standard DIN rail or a TU811/TU813/TU831/TU839/TU851 MTU. Ensure proper keying (keying code AB) to prevent mismatched mounting. Connect field wiring to the MTU terminals, respecting the maximum cable lengths and using appropriate cable types for AC or DC signals. Set the digital filter time (2, 4, 8, or 16 ms) via the control system to match the signal characteristics and noise environment. After power-up, verify that the front LEDs (Fault, Run, Warning) indicate normal operation.
Maintenance & Reliability
The DI820 is designed for long-term reliability in harsh industrial environments. To maintain optimal performance, periodically inspect the module for dust accumulation and ensure proper ventilation around the enclosure. Check that all field wiring is secure and free from corrosion. The module's EMC protection and optical isolation reduce the risk of damage from transient voltages, but regular testing of the voltage supervision function is recommended to confirm the warning LED and ModuleBus error signals operate correctly. With no moving parts, the DI820 requires minimal maintenance, contributing to lower total cost of ownership.
Compatibility & Integration
The ABB DI820 is part of the S800 I/O system and is compatible with MTUs TU811, TU813, TU831, TU839, and TU851. It communicates over the ModuleBus, allowing seamless integration with ABB AC 800M controllers and other S800-compatible systems. The module supports current sinking inputs and provides individually isolated channels, simplifying field wiring and improving system flexibility. For existing installations, the DI820 can replace older digital input modules, offering enhanced diagnostic capabilities and voltage supervision.
Selection Guide & Purchasing Advice
Before purchasing the ABB DI820, verify your system's voltage requirements and channel count. The DI820 handles 120 V AC/110 V DC signals and provides 8 channels, which is suitable for many applications. Ensure your MTU matches the keying code AB and that your controller supports the S800 series. When ordering, confirm the article number 3BSE008512R1 to guarantee you receive the correct module. PLC Source PRO offers authentic ABB DI820 modules with fast shipping and competitive pricing, making it a reliable partner for your automation spares needs.