General Information
The DI821 is a 8 channel, 230 V a.c./d.c, digital input module for the S800 I/O. This module has 8 digital inputs. The ac input voltage range is 164 to 264 V and the input current is 11 mA at 230 V a.c. The d.c. input voltage range is 175 to 275 volt and the input current is 1.6 mA at 220 V d.c. The inputs are individually isolated.
Every input channel consists of current limiting components, EMC protection components, input state indication LED, optical isolation barrier and an analog filter (6 ms).
Technical Specifications
| Input voltage range, "0" | 0..50 V a.c., 0..40 V d.c. |
| Input voltage range, "1" | 164..264 V a.c., 175..275 V d.c. |
| Input impedance | 21 kΩ (a.c.) / 134 kΩ (d.c.) |
| Isolation | Individually isolated channels |
| Filter times (digital, selectable) | 2, 4, 8, 16 ms |
| Input frequencey range | 47..63 Hz |
| Analog filter On/Off delay | 5 / 28 ms |
| Current limiting | Sensor power can be current limited by the MTU |
| Maximum field cable length | 200 meters (219 yards) 100 pF/m for a.c., 600 meters (656 yards) for d.c. |
| Rated insulation voltage | 250 V |
| Dielectric test voltage | 2000 V a.c. |
| 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 |
Functional Characteristics
- High-Voltage Compatibility
The DI821 is specially designed to handle 230V AC inputs, which are commonly found in legacy or long-distance wiring setups.
- Opto-Isolated Inputs
Each input channel is opto-isolated, offering excellent protection against voltage spikes and reducing the risk of system-wide faults.
- Diagnostics and LED Indicators
Integrated channel LEDs provide immediate status feedback, simplifying commissioning and fault diagnosis.
- Modular S800 I/O Format
The DI821 is compatible with ABB's modular S800 I/O system, enabling seamless expansion and flexible system design.
- Hot-Swappable Design
Modules can be removed or replaced without shutting down the entire system, significantly reducing maintenance-related downtime.
- Group-Wise Wiring
Channels are organized into two groups of eight, each with shared reference terminals, making wiring and troubleshooting easier.
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