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, counting and frequency measurement. Provides hardware filtering to suppress industrial electromagnetic interference. Channel‑to‑channel and field‑to‑backplane galvanic isolation. 
Application Scenarios Process industry distributed control system (DCS). Turbine flow meter pulse flow totalization measurement. Petrochemical plant rotating equipment shaft speed monitoring. Oil & gas turbine machinery pulse speed detection loops.
Structural Characteristics Standard single‑slot plug‑in structure matching Foxboro I/A Series rack. Front panel with status indicator LED lamps for power, channel fault and fieldbus communication. Field pulse signal terminals located at module front side for wiring maintenance.
Working Principle Field pulse signals enter through terminal connectors. Hardware filter circuits eliminate high‑frequency interference signals. Isolation optocouplers complete electrical isolation between field circuit and internal logic circuit. On‑board high‑speed counter captures pulse edge signals and executes counting and frequency calculation. Valid measurement data is transmitted to main control processor via HDLC fieldbus.
Installation Requirements Install the module into designated slot of Foxboro I/A Series standard rack. Ensure rack ground connection strictly follows system grounding specification. Field pulse signal wiring must use shielded twisted‑pair cables. Separate power cable and signal cable routing to avoid crosstalk. Confirm input pulse voltage amplitude matches module rated range before power‑on.
There are no reviews yet.