ABB DI821 230V AC/DC Digital Input Module | 8-Channel

ABB DI821 8-Channel 230V AC/DC Digital Input Module

The ABB DI821 module offers eight digital inputs for S800 I/O systems. It handles both 230V AC and 220V DC signals with individual channel isolation. This advanced module provides reliable performance for high-voltage industrial applications.

Key Features

• Eight 230V AC/DC input channels with current sinking
• Individually isolated channels for maximum safety
• Dual voltage supervision via channels 1 and 8
• Individual channel status indicators
• Built-in 6 ms analog filtering
• Compatible with TU811V1 and other MTUs

Technical Specifications

• Brand: ABB
• Model: DI821
• Article Number: 3BSE008550R1
• Input Voltage AC: 164-264V AC for "1" state
• Input Voltage DC: 175-275V DC for "1" state
• Input Current AC: 11 mA at 230V AC
• Input Current DC: 1.6 mA at 220V DC
• Input Impedance: 21 kΩ (AC), 134 kΩ (DC)
• Isolation: Individual channel isolation
• Filter Times: 2, 4, 8, 16 ms selectable
• Frequency Range: 47-63 Hz
• Max Cable Length: 200 meters AC, 600 meters DC
• Power Dissipation: 2.8 Watts typical

Installation & Wiring

• Compatible with S800 I/O systems
• 0.5-0.6 Nm recommended torque
• 6-7.5 mm wire stripping length
• Supports standard wire sizes
• Easy integration with ABB MTUs

Environmental Specifications

• Operating Temperature: 0 to +55°C
• Storage Temperature: -40 to +70°C
• Protection Class: IP20
• Relative Humidity: 5 to 95% non-condensing
• Marine certifications: ABS, BV, DNV, LR

Physical Dimensions

• Width: 45 mm (1.77”)
• Depth: 102 mm (4.01”)
• Height: 119 mm (4.7”)
• Weight: 0.18 kg (0.4 lbs.)

Compatibility

• Designed for S800 I/O platform
• Works with TU811, TU813, TU831 series
• Compatible with TU839, TU851 models
• Keying code: AC

Shipping Information

• Secure industrial packaging
• Worldwide shipping via FedEx, UPS, DHL
• Complete documentation included

Frequently Asked Questions

How does voltage supervision work on the DI821?

Channel 1 monitors channels 2-4, while channel 8 monitors channels 5-7 for voltage loss.

What is the analog filter specification?

The module includes a 6 ms analog filter with 5/28 ms on/off delay characteristics.

Can I use both AC and DC signals simultaneously?

Yes, the module supports mixed AC and DC signal operation on different channels.

What are the different cable length limits?

AC signals support 200 meters, while DC signals allow 600 meters maximum length.

How many channels have individual isolation?

All eight channels feature individual isolation for enhanced safety.

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