• Core Function: Provides 16 isolated digital input channels to acquire signals from field devices (e.g., limit switches, valve status sensors, emergency stops) and transmit them to ControlEdge C300 controllers for process monitoring and safety interlocks.
Manufacturer: Honeywell Part number: Honeywell 51307206-175
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51307206-175: Product OverviewThe 51307206-175 is a 16-channel digital input module engineered for Honeywell’s ControlEdge™ C300 distributed control system (DCS) and safety instrumented systems (SIS). It serves as a front-end interface for acquiring discrete signals from field-mounted devices, converting physical contact closures (dry) or voltage levels (wet) into digital data for controller processing. Its primary role is to enable reliable monitoring of process-critical and safety-critical states—such as valve positions, equipment status, or emergency stop activations—in industries where signal integrity and uptime are essential.Functionally, the module processes inputs from 16 independent channels, each configurable for dry contact (relay) or wet contact (24V DC) signals. It employs galvanic isolation (2500VAC) to prevent ground loops and electromagnetic interference (EMI) from corrupting data, a critical feature in electrically noisy industrial environments. As part of the ControlEdge C300 family, the 51307206-175 integrates with the platform’s high-speed I/O link, hot-swappable architecture, and unified engineering tools (ControlEdge Builder), simplifying configuration and maintenance. This design aligns with compliance to IEC 61508 (SIL 2) and standards like API 556 (refinery instrumentation), making it suitable for continuous process industries requiring uptime and safety.
• Response Time: <10 ms (typical, from input change to controller update)
• Power Supply: 24V DC (nominal, 18-30V DC range) from C300 chassis
• Power Consumption: 2W (typical, all channels active)
• Operating Temperature: -40°C to +70°C
• Humidity Range: 5% to 95% non-condensing
• Certifications: SIL 2 (IEC 61508), CE, UL, ATEX Zone 2 (optional)
• Dimensions: 25mm x 128mm x 115mm (width x height x depth, fits C300 I/O slot)
• Weight: 0.2kg
• Diagnostics: Channel status (open/short circuit), power monitoring, communication heartbeat
• Hot Swap Support: Yes (plug-and-play replacement without system shutdown)
Honeywell 51307206-175
Core Features & Customer ValueHigh-Channel Density Reduces Cabinet Footprint: With 16 input channels per module, the 51307206-175 minimizes the number of I/O modules required in a control cabinet. For engineers designing systems with numerous digital inputs (e.g., a refinery’s ESD panel with 12 emergency stops and 4 valve position switches), this cuts cabinet space by 50% compared to 8-channel alternatives, simplifying wiring and reducing material costs.Galvanic Isolation Ensures Signal Integrity: The 2500VAC isolation between channels and the C300 bus prevents ground loops and EMI from industrial equipment (e.g., motors, drives) from distorting input signals. In a chemical plant’s reactor monitoring system, this ensures reliable detection of limit switch activations—critical for preventing over-pressurization—even near high-power agitators.Comprehensive Diagnostics Simplify Maintenance: Built-in diagnostics monitor each channel for open circuits (broken wires), short circuits (to ground/power), and power supply health. Faults are reported to the C300 controller via I/O link, with LED indicators on the faceplate for quick visual identification. For maintenance teams, this reduces troubleshooting time from hours to minutes—e.g., identifying a faulty emergency stop button in a power plant’s turbine control system without invasive testing.Hot-Swappable Design Minimizes Downtime: The module can be replaced while the system remains powered, essential for continuous processes like oil refining or water treatment. Technicians simply remove the faulty module and insert a new one; the C300 controller automatically reloads configuration data via I/O link. This eliminates scheduled shutdowns for module replacement, saving thousands in lost production per incident.SIL 2 Certification for Safety-Critical Applications: When integrated into a Honeywell Safety Manager SIS, the 51307206-175 meets SIL 2 requirements (IEC 61508), enabling its use in safety functions like emergency shutdown (ESD) or equipment interlocks. Its fault-tolerant design (hardware fault tolerance ≥1) reduces the probability of dangerous failures, aligning with audit requirements for regulated industries.Typical ApplicationsThe 51307206-175 is deployed in systems requiring reliable digital input acquisition. In a petroleum refinery’s hydrotreater unit, it connects 16 safety devices: 8 emergency stop buttons (dry contact), 4 valve position switches (dry contact), and 4 flame detector status inputs (wet contact). The module’s SIL 2 certification ensures compliance with API 556, while hot-swap capability allows maintenance during planned turnarounds without halting production.At a chemical plant’s batch reactor, the 51307206-175 monitors 16 process interlocks: 8 agitator status switches (dry contact), 4 temperature limit switches (dry contact), and 4 pressure relief valve sensors (wet contact). Its 2500VAC isolation prevents EMI from nearby mixers from causing false trips, ensuring consistent batch quality.In a municipal water treatment plant, the module interfaces with 16 pump status switches (dry contact) and 4 valve position sensors (wet contact) across distributed lift stations. The C300 controller uses these inputs to trigger alarms or activate backups, with diagnostics alerting staff to a failed switch before service disruption.
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