Description
The ABB DI93A HESG440355R3 is a high-density, 120 VAC/125 VDC digital input module designed for the ABB Harmony and Melody series I/O, integral to the ABB Symphony™ Plus and earlier MOD 300 Distributed Control Systems (DCS). This module is engineered to reliably interface with high-voltage field contacts such as relay outputs, limit switches, selector switches, and pushbuttons commonly found in industrial environments. The ABB DI93A HESG440355R3 provides 32 isolated input channels, organized into groups, offering robust noise immunity and protection against voltage transients. Its design prioritizes safety and reliability, featuring built-in diagnostic capabilities and compatibility with hot-swap procedures in redundant configurations. This module is a critical component for high-channel-count applications requiring reliable status monitoring of high-voltage discrete signals in process industries like power generation, water treatment, and chemical manufacturing.
Parameter Values
- Product Model: DI93A HESG440355R3
- Brand: ABB
- Warranty: One Year
- Supply Voltage (Logic Side): 24 VDC (via backplane)
- Input Voltage Range: 90 – 140 VAC / 110 – 150 VDC
- Operating Temperature: 0°C to +60°C
- Storage Temperature: -40°C to +85°C
- Response Time: < 15 ms (AC), < 5 ms (DC)
- Input Type: 32 channels, Isolated in 4 groups (8 per group)
- On-State Current: 5 mA typical (AC), 3 mA typical (DC)
- Isolation: 1500 VAC channel-to-channel (within group) and group-to-system
- Communication Interface: Harmony/Melody series rack bus
- Diagnostics: Module status, group fault indication
- Protection: Optical isolation, transient suppression
- Dimensions: 223 mm (H) x 128 mm (W) x 119 mm (D)
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Application Scenarios
Power Plant Auxiliary System Monitoring: DI93A HESG440355R3 Monitoring the status of high-voltage circuit breakers, isolator switches, and pump/motor run feedback signals in switchgear and MCC (Motor Control Center) rooms of thermal or hydroelectric power plants.
Water and Wastewater Treatment: Reading the position status of high-voltage motor-operated valves (MOVs), pump discharge pressure switches, and high-level alarm contacts from control panels and field junction boxes.
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