DI821-eA Digital Input Module  

1. Key Parameters

• Number of Input Channels: 16 independent, galvanically isolated channels
• Input Type: Configurable for sinking (NPN) or sourcing (PNP) via software
• Input Voltage Range: 24V DC (15V~30V tolerance)
• Input Current: 3mA~10mA (at 24V DC)
• Response Time: ≤1ms (ON to OFF and OFF to ON)
• Isolation Level: 2.5kVrms (channel-to-channel, channel-to-power supply, channel-to-backplane)
• Protection Features: 2kV ESD protection (IEC 61000-4-2), 4kV EFT protection (IEC 61000-4-4), overvoltage protection
• Power Supply: 24V DC (±10% tolerance); Typical power consumption: ≤6W (full load)
• Operating Temperature Range: -20℃~+60℃
• Storage Temperature Range: -40℃~+85℃
• Communication Interface: Profinet (for 800xA system integration), Modbus RTU (for third-party PLC compatibility)
• Installation Method: 35mm standard DIN rail mounting
• Protection Class: IP20 (module body); Complies with IEC 61010-1 (safety) and IEC 61000-6-2 (EMC immunity)

2. Product Features

• High Channel Density: 16 independent channels in a compact housing maximize control cabinet space utilization, ideal for applications requiring extensive digital signal monitoring (e.g., production lines with multiple sensors).
• Flexible Input Configuration: Each channel can be independently set to sinking (NPN) or sourcing (PNP) via software, eliminating hardware modifications and supporting diverse industrial devices without module replacement.
• Fast Response: ≤1ms response time ensures accurate capture of fast-changing digital signals, critical for high-speed automation processes (e.g., packaging machinery, robotic assembly lines).
• Enhanced Isolation & Protection: 2.5kVrms galvanic isolation prevents ground loops and cross-interference; integrated surge protection resists industrial electrical noise and transient voltage spikes, ensuring reliable operation in harsh environments.
• Intuitive Diagnostics: Front-panel LED indicators for each channel (input status) and module-level status (power, communication) provide real-time visual feedback, enabling quick identification of faults (e.g., sensor wiring issues, power failures).
• Hot-Swappable Design: Supports online replacement (with compatible S800 I/O racks) without system shutdown, minimizing downtime in critical applications.
• Industrial Durability: Flame-retardant ABS housing (UL94 V-0) and anti-vibration design (IEC 60068-2-6: 50Hz, 5g acceleration) ensure stable performance in dusty, humid, or vibration-prone industrial settings.

3. Application Fields

• Manufacturing Automation: Acquisition of signals from proximity sensors (part detection), limit switches (conveyor positioning), and emergency stop buttons in automotive, electronics, and consumer goods production lines.
• Process Industry: Monitoring of valve position switches (open/closed status), pump run/stop signals, and pressure switch alarms in chemical, oil & gas, and pharmaceutical plants.
• Industrial Machinery: Detection of safety interlocks (guards, doors), motor overload relays, and bearing temperature switches in CNC machines, presses, and material handling equipment.
• Energy Sector: Monitoring of circuit breaker status, transformer alarms, and switchgear interlocks in power distribution systems and renewable energy (solar/wind) facilities.
• Building Automation: Collection of signals from door contacts, fire alarms, and equipment status sensors in smart buildings, data centers, and industrial facilities.

4. Precautions

• Input Voltage Compatibility: Ensure the input voltage is within the 15V~30V DC range to prevent damage to input circuits; confirm compatibility with connected sensors (NPN/PNP) before configuration.
• Wiring Best Practices: Use shielded cables for input lines and route them separately from high-voltage power cables (≥30cm spacing) to minimize electromagnetic interference (EMI) and false signals.
• Overcurrent Prevention: Do not exceed the maximum input current (10mA) to avoid overheating of input circuits; use appropriate fuses for external wiring if necessary.
• Hot-Swap Procedure: Follow system-specific guidelines when performing hot-swap replacement to avoid transient current spikes that may affect other modules in the I/O rack.
• Environmental Considerations: Avoid installation near strong magnetic fields (e.g., large motors, transformers) or heat sources exceeding 60℃; ensure proper ventilation to maintain operating temperature within range.
• Regular Maintenance: Periodically inspect terminal connections for tightness and clean the module surface to remove dust accumulation, which can cause overheating or signal interference

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