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ABB DI802 8-channel 120 V AC/DC digital input module

1. Product Description

The ABB DI802 is a versatile 8-channel digital input module designed for industrial automation systems, supporting both 120 V AC and 120 V DC input signals. It is specialized in receiving digital signals from on-site devices such as industrial switches, photoelectric sensors, and alarm contacts, then converting these signals into digital data that can be identified and processed by upper controllers (e.g., ABB AC 800M DCS). With excellent voltage compatibility and anti-interference performance, this module ensures accurate and stable transmission of on-site status signals, laying a reliable foundation for industrial process monitoring and control.

2. Detailed Parameters

Parameter Category	Specifications
Input Channels	8 channels (isolated per channel)
Input Signal Type	120 V AC / 120 V DC digital input (dual-voltage compatible)
Input Voltage Range (AC)	96 - 144 V AC (50/60 Hz)
Input Voltage Range (DC)	96 - 144 V DC
Input Current	AC: Typical 3 mA (at 120 V AC); DC: Typical 2.5 mA (at 120 V DC)
Isolation	Channel-to-channel: 1500 V AC (1 minute); Channel-to-backplane: 1500 V AC (1 minute)
Response Time	≤ 5 ms (for AC signal transition); ≤ 2 ms (for DC signal transition)
Operating Temperature	-40°C to +70°C
Dimensions (W×H×D)	48.3 × 100 × 150 mm
Mounting Method	DIN rail mounting (compatible with standard 35 mm DIN rails)

3. Advantages & Features

Dual-Voltage Compatibility: Supports both 120 V AC and 120 V DC input signals, eliminating the need for separate modules for different voltage systems and reducing inventory costs.

Independent Channel Isolation: Each channel is independently isolated with 1500 V AC insulation, effectively preventing cross-interference between signals and enhancing system stability.

Wide Voltage Tolerance: AC/DC input voltage ranges have ±20% tolerance, adapting to fluctuations in on-site power supply and ensuring normal operation in unstable power environments.

Suitable for Multiple Scenarios: Balanced response time (2-5 ms) meets the monitoring needs of most industrial processes, from general mechanical control to medium-speed production lines.

Durable Structure: Withstands harsh industrial conditions such as wide temperature ranges (-40°C to +70°C) and electromagnetic interference, ensuring long-term reliable operation.

4. Application Fields

Building Automation: Monitoring the status of HVAC system valves, lighting switches, and fire alarm contacts in commercial buildings or industrial facilities.

Heavy Industry (Steel/Non-Ferrous Metals): Detecting the on/off status of high-voltage equipment auxiliary switches, conveyor line limit sensors, and blast furnace auxiliary device contacts.

Marine & Offshore: Controlling and monitoring the status of shipboard equipment switches, cabin door sensors, and navigation auxiliary device signals (compatible with marine 120 V AC/DC power systems).

Municipal Infrastructure: Monitoring the operation status of water pump stations, sewage treatment plant valve switches, and street lamp control contacts.

5. Precautions

Confirm the input voltage type (AC/DC) and range before wiring; do not connect voltages exceeding 144 V AC/DC to avoid module damage.

When installing in marine or humid environments, ensure the module is placed in a waterproof and moisture-proof cabinet to prevent short circuits caused by water ingress.

For AC input signals, verify the power frequency (50/60 Hz) matches the module’s design to avoid signal distortion or response delay.

During wiring, use wires with sufficient insulation strength (≥1500 V AC) to match the module’s isolation level and prevent electric leakage.

Regularly inspect the module’s terminal screws for tightness; looseness may cause poor contact and affect signal transmission, especially in vibration-prone environments

The structure and details of the product：

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