ALCATEL FA111

Description

Product Overview

ALCATEL FA111 is a rack-mounted industrial analog signal conditioning module developed for distributed process control systems. It realizes galvanic isolation, signal conversion and impedance matching between field analog transmitters and main DCS control backplane, supporting universal standard 4–20 mA two-wire transmitter input signals. The module filters industrial electromagnetic interference and eliminates ground loop deviation to ensure stable analog data acquisition for flow, pressure, temperature and liquid level closed-loop control loops. It complies with global industrial automation EMC and cabinet installation standards for continuous plant operation.

Technical Specifications

• Dimension: 6 TE Eurocard width, overall size 102 mm × 78 mm × 34 mm
• Net Weight: 0.13 kg
• Operating Power Supply: 24 V DC, nominal current draw 280 mA
• Input Signal Type: Universal 4–20 mA two-wire passive transmitter signal
• Channel Quantity: 4 independent isolated analog input channels per unit
• Galvanic Isolation Voltage per Channel: 2000 V AC reinforced isolation
• Input Sampling Resolution: 16-bit analog-to-digital conversion
• Measurement Basic Accuracy: ±0.05% full scale
• Signal Filter Cutoff Frequency: 15 Hz hardware low-pass filter
• Operating Temperature Range: 0 °C to +60 °C
• Storage Temperature Range: -40 °C to +85 °C
• EMC Compliance Standard: EN 61000-6-2 industrial heavy interference standard
• Ingress Protection Grade: IP20 for cabinet internal installation

Function Features

1. Four fully independent galvanically isolated analog input channels for multi-channel field transmitter signal collection
2. Built-in 15 Hz low-pass hardware filter suppresses high-frequency motor and inverter electromagnetic noise
3. High-precision 16-bit ADC converts analog current signal into digital bus data for DCS backplane transmission
4. Automatic open-circuit fault detection for each input channel; outputs fixed over-range fault code upon wire breakage
5. Front panel independent LED indicators for power supply, channel running status and channel fault alarm
6. Impedance matching circuit eliminates ground loop measurement deviation caused by multi-point field grounding
7. Backplane digital bus communication transmits processed analog data to main DCS controller without signal attenuation

Performance Parameters

• Channel signal sampling period: ≤ 8 ms per four-channel full scan
• Long-term zero drift per year: ≤ ±0.03% full scale
• Fault diagnostic coverage rate for input line faults: 99.1%
• Mean Time To Dangerous Failure (MTTFd): > 1,520,000 hours under rated working condition
• Continuous operation duty cycle: 100% 24/7 non-stop operation
• Signal transmission bit error rate: < 1 × 10⁻¹¹

Material Composition

• Main Circuit Board: UL94-V0 FR4 flame-retardant double-layer printed circuit board
• Front Panel Shell: Black PA66 flame-retardant industrial plastic
• Channel Isolation Components: High-voltage reinforced insulation optocoupler arrays
• Signal Conversion Chip: Industrial wide-temperature grade 16-bit ADC integrated circuit
• Terminal Connectors: Nickel-plated copper alloy screw terminal blocks with PA66 insulation base
• Rack Lock Hardware: Zinc-plated spring steel anti-vibration locking clips

Structural Characteristics

• Standard 6 TE vertical plug-in Eurocard structure, compatible with Alcatel FA series unified rack backplane
• Rear DIN 41612 96-pin backplane connector for power supply and digital data bus interconnection
• Front panel split terminal blocks separately lead out four-channel field signal wiring terminals
• Internal single-layer EMI shielding plate separates analog signal circuit and digital bus circuit
• Mechanical anti-loosening lock tab prevents module displacement under mechanical vibration of production equipment
• Sealed internal component cavity to avoid conductive dust accumulation inside cabinet

Working Principle

Field 4–20 mA two-wire transmitter analog signals enter independent channel isolation circuits through front terminals. Each channel passes through low-pass filter and impedance matching circuit to filter out high-frequency interference and eliminate ground loop offset. The isolated analog signal is sent to 16-bit ADC chip for digital conversion. After digital signal sorting and packaging, data is transmitted to DCS main controller via rack internal digital bus. Real-time fault detection circuit continuously monitors channel current range; if open circuit or short circuit occurs, fault LED lights up and fault information is uploaded to upper controller system synchronously. The reinforced isolation layer completely isolates field side and control cabinet side electrical circuits to prevent field surge voltage from damaging main control equipment.

Advantage Highlights

1. Four-channel independent reinforced isolation avoids cross-channel signal crosstalk interference
2. Built-in hardware low-pass filter reduces DCS measurement fluctuation caused by workshop inverter equipment
3. Ultra-low long-term zero drift reduces frequency of on-site regular calibration maintenance
4. Compact 6 TE narrow slot design saves cabinet installation space for multi-point analog acquisition systems
5. Automatic line break fault detection realizes unattended remote monitoring of field transmitter state
6. Universal 4–20 mA signal compatibility matches all mainstream industrial pressure, flow, temperature transmitters

Applicable Industries

Petrochemical process control DCS cabinets, thermal power plant boiler analog monitoring systems, water treatment plant flow and level measurement control, food pharmaceutical batch production closed-loop control, cement manufacturing kiln parameter monitoring systems

Installation Requirements

1. Install on Alcatel FA series dedicated 19-inch Eurocard rack backplane slots only
2. Maintain minimum 12 mm vertical ventilation gap above and below each FA111 module for heat dissipation
3. Rack 24 V DC power supply must be equipped with 5 A slow-blow T-type safety fuse
4. Field analog wiring adopts shielded twisted pair cable, shield layer grounded only at cabinet terminal side
5. Cabinet internal environment humidity limited to 5%–90% non-condensing, no acid and alkali corrosive gas
6. Avoid arranging analog signal cables parallel to high-power AC frequency conversion cables within 30 cm range

Usage Precautions

1. Hot plugging is forbidden; cut off the entire rack power supply before dismounting or inserting the module
2. Do not input AC voltage signal into analog input terminals; maximum allowable field signal voltage is 24 V DC
3. Calibration operation must use standard 4–20 mA signal generator, executed under static production shutdown state
4. Monthly visual inspection of front panel fault LED to find hidden wiring aging faults in advance
5. Spare modules need to be stored in anti-static shielding bags under constant 18–22 °C temperature
6. Long-term operation over +60 °C ambient temperature will permanently reduce ADC chip service life