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Hitachi LYA010A
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ABB LWN2660-6EG 3BHL000986P7002
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Hitachi LYD000A
Hitachi LYD000A

Hitachi LYA010A

Product Introduction:​
The Hitachi LYA010A is a 16-channel analog input (AI) module belonging to Hitachi’s H-System (H5000/H7000 series) distributed control system. It acquires standard 4–20 mA process signals from field transmitters (pressure, flow, temperature via transmitter) and converts them to digital values for the control processor, with per-channel isolation and diagnostic capability.
Category:
Description
Key Technical Specifications:
  • Manufacturer:​ Hitachi, Ltd. (Japan)
  • Model:​ LYA010A
  • Platform:​ Hitachi H-System DCS (H5000 / H7000 I/O rack)
  • Input Channels:​ 16 channels (single-ended / differential selectable in some firmware)
  • Input Signal Types:​ 4–20 mA DC (default), 0–20 mA (software-configurable)
  • Input Impedance:​ ≈250 Ω (typical for 4–20 mA)
  • A/D Resolution:​ 16-bit
  • Accuracy:​ ±0.1% of Full Scale @ 25 °C
  • Conversion Time:​ ≈50 ms per channel scan cycle
  • Isolation:​ Channel-to-ground photocoupler isolation >500 VAC
  • HART Support:​ Optional HART multiplexing (depends on system firmware revision)
  • Diagnostics:​ Open-wire / short-circuit detection per channel; module fault reporting
  • Power Supply:​ +24 VDC via backplane
  • Operating Temp:​ –10 °C to +60 °C
  • Installation:​ Plugs into standard H-System I/O rack/baseplate
  • Certifications:​ CE, UL, IEC 61000-4EMC Level 3
Functional Features:
  • Software-selectable burnout detection (upscale/downscale)
  • Linearization and square-root extraction available in controller software
  • Supports mixed signal types across channels (if firmware permits)
  • Status LEDs for module RUN / ERR / COM
Application Scenarios:
  • Continuous process measurement in chemical plants (flow, pressure, level)
  • Power plant auxiliary system analog data acquisition
  • Pulp & paper process variable monitoring
Material & Structure:
  • Molded flame-retardant plastic front bezel
  • Gold-plated backplane edge connector
  • Field wiring via dedicated terminal block or TB unit
Installation & Notes:
  • Verify DIP-switch / software jumper settings for current/voltage mode before commissioning
  • Shielded twisted-pair cabling recommended for analog loops
  • Do not exceed max loop resistance (check system documentation — typically <600 Ω including transmitter burden)
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