Description
Product Brief Introduction
DIN rail mount compact analog input safety module for HIMatrix standalone small-scale safety PLC systems, certified IEC 61508 SIL 3 safety integrity level. Collects 4–20 mA analog measurement signals from hazardous area pressure, temperature, flow and level transmitters, executes safety-range signal limit checking, and transmits validated analog process values to HIMatrix safety controllers via internal CAN safety bus. Optimized for compact cabinet ESD and fire & gas safety monitoring systems with limited installation space.
Core Technical Specifications
- Module Operating Power Supply: 24 V DC ±10% control cabinet power
- Analog Input Channel Count: 4 fully isolated 4–20 mA analog input channels
- Supported Transmitter Signal Standard: 2-wire 4–20 mA loop-powered field transmitters
- Channel Galvanic Isolation: Each analog channel electrically isolated from internal CAN safety bus
- Communication Bus Interface: HIMatrix proprietary CAN redundant safety bus
- Mounting Standard: 35 mm EN standard DIN rail snap installation
- Module Dimensions: 105 mm × 76 mm × 22.5 mm
- Net Weight: 0.11 kg
- Protection Class: IP20 indoor cabinet installation only
- Safety Certification: SIL 3 IEC 61508, TÜV certified, ATEX Zone 2 cabinet mounting approved
- Operating Temperature Range: -20°C ~ +60°C
- Measurement Signal Resolution: 16-bit high precision analog-to-digital conversion per channel
Function Features
- Independent 16-bit AD conversion for each of four analog channels, continuous real-time conversion of 4–20 mA transmitter loop signals
- Configurable high/low process value safety limit threshold detection; independent alarm and safety trip logic for every channel
- Automatic transmitter wire break fault detection; identifies loop open-circuit conditions indicated by signal below 3.6 mA
- Hardware anti-aliasing low-pass signal filter with adjustable filtering time constant to eliminate industrial electromagnetic noise interference
- Dual redundant internal signal processing logic to detect and flag internal hardware measurement circuit faults
- Front panel dedicated LED indicators: global POWER status, global FAULT diagnostic, and four individual channel signal status LEDs
- Non-volatile memory storage of channel calibration parameters and fault event history, retained without external power supply
- Loop short-circuit overcurrent protection for each analog input channel to prevent module circuit damage during field wiring faults
Performance Parameters
- Analog Measurement Accuracy Class: 0.1 full-scale reading
- Channel Conversion Sampling Rate: Maximum 100 Hz continuous conversion per channel
- Galvanic Isolation Withstand Voltage: 2000 V AC between field loop and CAN bus circuit
- SIL 3 PFDavg Rating: ≤ 1.0×10⁻⁷ per safety demand
- Wire Break Fault Response Time: ≤ 50 ms upon loop signal drop below 3.6 mA
- Valid Measurement Signal Range: 3.6 mA to 22 mA; signals outside range trigger hardware fault flag
Material Composition
- Module Housing: Self-extinguishing PA66 flame retardant anti-static plastic enclosure
- Internal PCB: Double-sided FR4 conformal coated printed circuit board for humidity resistance
- Isolation Components: Low-drift epoxy encapsulated analog isolation optocouplers
- Wiring Terminals: Spring-clamp vibration-resistant copper alloy nickel-plated terminal blocks
- Status Indicators: SMD industrial long-life LED light elements
Structural Characteristics
- Single narrow-width DIN rail snap-on design, no mounting screws required for cabinet installation
- Front panel layout separated into diagnostic LED zone and channel identification labeling zone for rapid maintenance
- Physical internal plastic barrier divides field analog channel terminal area and CAN bus communication terminal area
- Compact stacked PCB layout optimized for minimal cabinet space occupation in small safety control enclosures
- All external wiring connections utilize pluggable spring terminal blocks for fast module replacement without re-cabling field transmitters
Working Principle
24 V DC cabinet power energizes the module’s internal dual safety microprocessors and four independent analog loop power supplies for field 2-wire transmitters. Each 4–20 mA analog loop current signal passes through hardware anti-aliasing filtering and galvanic isolation before conversion via 16-bit AD converter. Dual internal processors independently convert and validate each channel’s digitalized process value, cross-checking calculation results to detect internal circuit malfunctions. Pre-programmed high/low safety limit thresholds are continuously compared against live measurement values; signals exceeding limits trigger safety alarm data transmission to the HIMatrix safety controller. The module continuously monitors loop current magnitude to identify wire break open-circuit faults below 3.6 mA loop current. Valid process measurement data and detected fault codes transmit to the safety controller via redundant CAN safety bus in standardized safety protocol format. Front panel LEDs reflect live channel signal presence, module power status and global hardware fault conditions for visual on-site diagnostics.
Advantage Highlights
- SIL 3 TÜV safety certification enables deployment within critical process safety interlock and emergency shutdown systems
- Four fully isolated high-precision 16-bit analog input channels integrated into ultra-narrow DIN rail housing to save cabinet installation space
- Built-in loop power supply for 2-wire transmitters eliminates requirement for external field power distribution hardware
- Automatic wire break detection function eliminates separate loop monitoring hardware for analog measurement circuits
- Dual redundant signal processing eliminates single internal circuit fault risks for safety-critical measurement data
Applicable Industries
Small chemical plant safety monitoring skids, gas turbine auxiliary safety control cabinets, waste incineration boiler process safety interlocks, small-scale LPG storage tank level & pressure safety systems, water treatment hazardous chemical dosing safety monitoring, marine vessel compact fire & gas safety control panels
Installation Requirements
- Install exclusively within non-hazardous Zone 2 safety control cabinets; forbidden direct mounting inside Zone 0/1 hazardous classified areas
- Analog transmitter field wiring uses shielded twisted pair instrument cable, shielding grounded single point at cabinet DIN rail earth bar
- Maintain minimum 50 mm separation distance between analog signal wiring and high-power AC drive cabling inside control cabinet
- DIN rail must be bonded to facility protective earth via dedicated copper grounding conductor
- Multiple F3330 modules installed adjacent to one another require minimum 5 mm side clearance for passive heat dissipation
Usage Precautions
- Do not connect 4–20 mA analog output equipment without loop isolation directly to module input channels to avoid ground loop measurement drift
- All channel safety limit threshold parameter modifications must be logged and validated per site process safety management procedures
- Cut off 24 V DC module power supply before removing pluggable field wiring terminal blocks
- If global FAULT LED activates after verifying field transmitter wiring integrity, replace module immediately to maintain SIL 3 safety compliance
- Avoid installation within 15 cm of frequency converters or large contactors to prevent induced noise distorting analog measurement accuracy
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