Product Short Description
Product Overview
High-density SIL 3 certified analog signal acquisition module designed for HIMax safety systems, collecting standard 4–20 mA analog signals from field transmitters (pressure, temperature, level, flow sensors). Each channel integrates independent short-circuit protection and dedicated transmitter power supply, realizing isolated signal collection of up to 32 field analog devices on a single module slot.
Description
Technical Specifications
- Channel Quantity: 32 isolated analog input channels
- Input Signal Standard: 4–20 mA two-wire transmitter signal
- Channel Power Supply: Each channel provides 24 V DC loop power for field transmitters
- Signal Resolution: 12-bit analog-to-digital conversion
- Channel Isolation: Galvanic isolation between every input channel, isolation voltage 2500 V AC
- Response Time per Channel: ≤ 10 ms
- Safety Certification: IEC 61508 SIL 3, TÜV certified
- Power Consumption: Max 18 W at full 32-channel load
- Dimension: 130 mm × 70 mm × 22 mm, weight 0.65 kg
- Operating Temperature: -20 ℃ ~ +60 ℃
- Diagnostic Functions per Channel: Open circuit detection, short circuit detection, over-range signal alarm
Core Functional Features
- Independent galvanic isolation for all 32 channels, eliminating ground loop interference in field wiring
- Built-in loop power supply for two-wire transmitters, eliminating external power distribution for field sensors
- Real-time channel diagnosis of wire breakage, short circuit and signal out-of-calibration range
- High-density design, occupying only one baseplate slot to reduce cabinet space occupation
- Hot-swappable support, single module replacement without stopping the entire safety system
- Digital filtering algorithm to suppress industrial high-frequency signal noise from frequency converters and motors
- Signal raw value upload to X-CPU 01 via redundant XBus backplane bus
Working Principle
Each 4–20 mA field analog signal enters the independent isolation circuit of the corresponding channel, converting analog current signals into isolated voltage signals. The onboard ADC chip completes 12-bit high-speed sampling and digital conversion, then transmits digital signal values to the backplane XBus. The module’s internal diagnostic circuit continuously monitors loop current; if current is lower than 3.6 mA (wire break) or higher than 22 mA (short circuit), fault flag information is sent to the main CPU for interlock alarm trigger. Each channel’s isolated power circuit provides stable 24 V DC supply to field transmitters without mutual crosstalk between channels.
Structural & Material Characteristics
- Main housing: Extruded aluminum alloy shielding shell
- Channel circuit board: Multi-layer isolated FR4 PCB, independent isolation transformer per channel
- Wiring terminals: Screw-type gold-plated terminals compatible with 0.5–2.5 mm² shielded cables
- Front panel LED: Separate fault indicator light for each channel group
Installation Requirements
- Install on any free I/O slot of HIMax baseplate
- Field analog cables must use shielded twisted-pair wire, separate wiring trough from strong-current power cables
- Cable shielding layer single-point grounding at cabinet terminal row, no two-end grounding
- Leave 15 mm heat dissipation gap between adjacent I/O modules
Application Scenarios
Continuous collection of process parameters in chemical plants, oil refinery flow/pressure monitoring, power plant boiler temperature measurement, water treatment tank liquid level safety monitoring, gas pipeline pressure detection SIS systems.
Operation & Maintenance Precautions
- Do not connect AC voltage to analog input channels; overvoltage will burn channel isolation circuits
- Calibrate channel signal range every 12 months according to transmitter calibration parameters
- When replacing field transmitters, cut off the corresponding channel power through system software instead of live wire disconnection
- Regularly check terminal screws for loosening, loose contacts cause unstable analog signal fluctuation
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