Technical Specifications Input Signal Type: Pulse signal, digital level signal Input Voltage Range: 5 VDC to 48 VDC Input Impedance: 5 kΩ typical value Maximum Input Pulse Frequency: 100 kHz Channel Isolation Voltage: 500 V RMS Transient Surge Suppression: 1500 V Operating Power Supply: 24 VDC from system backplane bus Communication Protocol: Proprietary 2 Mbps HDLC fieldbus for I/A Series system Operating Temperature: ‑40 ℃ to +70 ℃ Storage Temperature: ‑50 ℃ to +85 ℃ Relative Humidity: 5%‑95%, non‑condensing Mechanical Dimension: Standard single‑slot plug‑in module for Foxboro I/A Series rack Certifications: CE, UL, ATEX, IEC 61508 functional safety compliance
Functional Features Supports multi‑channel high‑frequency pulse signal acquisition, pulse counting and frequency measurement. Hardware filtering for restraining industrial electromagnetic interference noise.
Application Scenarios Process industry distributed control system(DCS). Turbine flow‑meter pulse flow totalization measurement loops. Petrochemical plant rotating‑equipment shaft‑speed real‑time monitoring. Oil & gas turbo‑machinery pulse speed detection.
Structural Characteristics Standard single‑slot plug‑in structure matching Foxboro I/A Series rack. Front panel equipped with status LED indicators for power supply, channel fault and fieldbus communication. Field pulse signal terminals are arranged on module front side for convenient wiring and maintenance work.
Working Principle Field pulse signals flow into module through front‑side terminal connectors. Hardware filter circuit eliminates high‑frequency interference noise. Isolation optocoupler completes electrical isolation between field circuit and module internal logic circuit. On‑board high‑speed counter captures pulse edge signal, executes counting and frequency calculation. Valid measurement data is transmitted to main control processor via HDLC fieldbus. On‑board diagnostic circuit continuously monitors each channel working condition.
Installation Requirements Insert module into designated slot of Foxboro I/A Series standard rack. Ensure rack ground connection strictly complies with official system grounding specification. Field pulse signal wiring must adopt shielded twisted‑pair cables. Signal cable routing shall separate from power cable to avoid crosstalk.
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