ABB S800 I/O DI821 Digital Input 3BSE008550R1

Overview

The ABB DI821 is an 8-channel digital input module designed for the S800 I/O system, supporting 230 V AC/DC signals. It features individually isolated channels, voltage supervision for field input power, and robust diagnostics for enhanced performance and reliability. Ideal for industrial automation applications requiring accurate and efficient signal processing.

Technical Specifications

Brand: ABB
Model: DI821
Signal Type: Current sinking, 230 V AC / 220 V DC
Input Voltage Range:

• Logic “0”: 0–50 V AC, 0–40 V DC
• Logic “1”: 164–264 V AC, 175–275 V DC

Input Impedance:

• 21 kΩ (AC)
• 134 kΩ (DC)

Isolation: Individually isolated channels
Filter Times: 2, 4, 8, 16 ms (selectable)
Max Field Cable Length:

• 200 m for AC (100 pF/m)
• 600 m for DC

Power Consumption: Typical 2.8 W
Module Dimensions: 45 mm (W) × 119 mm (H) × 102 mm (D)

Environmental Standards:

• Operating Temperature: 0 to +55 °C
• Storage Temperature: -40 to +70 °C
• Relative Humidity: 5–95%, non-condensing

Certifications: CE, RoHS, WEEE, ABS, DNV, and IEC compliance.

FAQ

Q1: What is the input voltage range for AC signals?
The input voltage range for logic “1” is 164–264 V AC.

Q2: Does the DI821 support redundancy?
No, this module does not support redundancy.

Q3: Can it be used in corrosive environments?
Yes, the DI821 offers G3-level corrosion protection as per ISA-S71.04 standards.

Q4: What is the function of channels 1 and 8?
Channels 1 and 8 can supervise the power supply for other channels, providing early fault detection.

Q5: Which MTUs are compatible with the DI821?
The module is compatible with TU811, TU813, TU831, TU839, and TU851 MTUs.

For more detailed information: S800 IO