Introduction
When an industrial process demands reliable detection of 120V AC or DC signals across multiple isolated points, the ABB DI828 digital input module delivers a robust solution. Part of the S800 I/O family, this module provides 16 individually isolated channels, ensuring signal integrity even in electrically noisy environments. Each channel includes current limiting, EMC protection, an LED indicator, optical isolation, and an analog filter. Additionally, channel 1 can supervise voltage for channels 2–8, and channel 16 for channels 9–15, with a Warning LED and error signal available via the ModuleBus.
Technical Specifications Breakdown
The DI828 operates with an AC input voltage range of 77–130 V and a DC range of 75–130 V. At 120V AC, input current is 8.5 mA; at 120V DC, it is 2.4 mA. Input impedance measures 14.2 kΩ for AC and 50 kΩ for DC. The module features individually isolated channels, selectable digital filter times (2.5±0.5, 5±1, 10±2, 20±4 ms), and an analog filter with 5/10 ms on/off delay. Power dissipation is typically 3.5 W, with a +5 V ModuleBus current consumption of typ. 45 mA (max 60 mA). The rated insulation voltage is 250 V, and dielectric test voltage is 2000 V AC. Operating temperature ranges from 0 to +55 °C (approvals issued for +5 to +55 °C), with storage from -40 to +70 °C.
Industry Applications
In a chemical processing plant, the DI828 monitors valve position feedback from 120V AC limit switches across multiple zones. The individually isolated channels prevent ground loops and cross-talk, while the selectable digital filter rejects contact bounce. For a water treatment facility, the module detects pump run signals at 120V DC, with channel 1 supervising the supply voltage for a group of eight inputs. If the voltage drops, the Warning LED alerts operators, reducing unplanned downtime.
Installation & Setup Guidance
Mount the DI828 on a standard S800 I/O base (e.g., TU851 MTU). Ensure the field cable length does not exceed 200 meters for AC (100 pF/m) or 600 meters for DC. Use the keying code TU851 to prevent incorrect insertion. Connect the 120V AC/DC field signals to the appropriate terminals, observing polarity for DC inputs. Configure the digital filter time via the S800 configuration tool based on the input signal characteristics. For voltage supervision, wire the group supply to channel 1 or 16.
Maintenance & Reliability
Periodically inspect the DI828 for dust accumulation and ensure the ambient temperature remains within 0 to +55 °C (or +40 °C for vertical mounting in compact MTU). Verify the front LEDs (Fault, Run, Warning, and channel status) indicate normal operation. The module is protected to IP20 and designed for pollution degree 2 per IEC 60664-1. Corrosion protection meets ISA-S71.04 G3. Regular inspection helps extend service life and maintain reliability.
Compatibility & Integration
The DI828 integrates seamlessly with the S800 I/O system via the ModuleBus. It is compatible with MTU EB and uses keying code TU851. The module supports CE marking, electrical safety per EN 61010-1 and UL 61010-1, and marine certifications from ABS, BV, DNV, and LR. EMC compliance meets EN 61000-6-4 and EN 61000-6-2. For system integration, confirm compatibility with your specific S800 base and controller.
Selection Guide & Purchasing Advice
Before purchasing the DI828, verify your system requires a 16-channel 120V AC/DC digital input module with individually isolated channels. Confirm the field voltage range (77–130 V AC, 75–130 V DC) and cable length limits. The article number is 3BSE069054R1. SpareTechPLC offers this module with detailed specifications and support. Please verify current lifecycle status and availability with SpareTechPLC before ordering.
Frequently Asked Questions
Q1: What is the input voltage range for the DI828 on AC?
A1: The AC input voltage range is 77–130 V, with a typical input current of 8.5 mA at 120V AC.
Q2: Can the DI828 supervise voltage for groups of inputs?
A2: Yes, channel 1 can supervise voltage for channels 2–8, and channel 16 for channels 9–15. If the supervision voltage disappears, a channel error is set and the Warning LED turns on.
Q3: What is the maximum field cable length for the DI828?
A3: For AC inputs, the maximum length is 200 meters (656 yards) with 100 pF/m capacitance. For DC inputs, the maximum is 600 meters (656 yards).
Q4: Does the DI828 support HART or SOE?
A4: No, the DI828 does not support HART or SOE. It is a standard digital input module.
Q5: What are the selectable digital filter times?
A5: The digital filter times are selectable at 2.5±0.5, 5±1, 10±2, and 20±4 ms.
