LEG FW1-2-1-D

Technical Specifications: Analog-input versions accept 0 to 10 V DC and 0/4 to 20 mA with DIP or terminal range selection; frequency-output versions provide adjustable pulse output from 20 Hz to 10 kHz in standard ranges and up to 100 kHz in extended range settings; single output channel for FW1-2-1-D; D suffix provides input-output galvanic isolation, with three-way isolation versions rated up to 2.5 kV RMS for power, input and output; power supply 24 V DC; push-pull HTL or configured pulse output with short-circuit protection on supported versions; DIN-rail mounting on 35 mm TS35; linearity approximately ±0.1 percent; response time configured according to filtering, commonly 20 ms or less for fast pulse conversion; operating temperature confirmed from nameplate, with standard industrial units 0 to 60 °C and extended units -25 to 70 °C.

Functional Features: DIP-switch or potentiometer range setting, isolated analog and pulse domains, LED output-status indication on supported versions, narrow housing for high-density panels, wire-break and overload protection on configured outputs, and direct connection to PLC, DCS, counter or recorder interfaces.

Application Scenarios: Flow totalization by converting 4 to 20 mA to pulse train, speed signal transmission by converting analog setpoint to frequency, encoder or pulse-to-analog conversion for legacy recorders, distance and position reporting, process isolation between field sensors and control systems, and signal duplication across isolated loops.

Performance Parameters: Full-scale linearity ±0.1 percent on calibrated ranges; configurable zero and span; isolation suppresses ground loops between sensor, converter and controller; HTL pulse output supports long cable runs when properly loaded; analog reconstruction versions provide 0 to 10 V or 0/4 to 20 mA according to output code.

Material Composition: Industrial PCB, precision operational amplifiers or frequency synthesizer circuitry, optocouplers or transformer isolation, molded narrow DIN-rail housing, screw terminals with clear marking, and status LEDs.

Structural Characteristics: Modular DIN-rail device with power, input and output terminal groups; DIP switches or potentiometers for range setup; isolated internal sections physically separated to maintain dielectric ratings; compact width according to FW1 narrow-family design.

Working Principle: In analog-to-frequency mode, the input voltage or current is conditioned, compared with the selected range, and converted by a voltage-controlled oscillator or digital converter to a proportional pulse frequency. In pulse-to-analog mode, incoming pulses are counted or timed, scaled by the configured range, and reconstructed as 0 to 10 V or 4 to 20 mA output. Isolation barriers separate power, field input and controller output.

Installation Requirements: Mount on 35 mm DIN rail in a dry control panel; supply regulated 24 V DC to the power terminals; wire analog inputs with shielded cable and ground the shield at one point; set DIP switches or potentiometers before applying field signals; verify output type, HTL pulse or analog, against the controller input; separate high-voltage wiring from low-level signal terminals.

Usage Precautions: Confirm whether the unit is programmed for analog-to-frequency or frequency-to-analog before wiring; do not exceed 24 V DC supply rating; avoid applying mains voltage to signal terminals; check isolation rating before connecting multiple ground references; do not short HTL output beyond its rated load; recalibrate zero and span after any range change; replace with identical FW1-2-1-D firmware and isolation option unless reconfiguration