ABB CMA135
ABB CMA135 - Image 2

ABB CMA135

Product Brief Introduction

ABB CMA135 is a dedicated multi-channel analog signal conditioning and isolation terminal board developed exclusively for ABB Advant 800xA power plant distributed control system, matched with CMA126 main control CPU module. It undertakes full signal isolation, noise filtering, analog-to-digital conversion and signal distribution tasks for all low-level field sensor signals inside thermal power, hydropower and cogeneration plants. The board features independent galvanic isolation for every signal channel, strong anti-electromagnetic interference performance adapted to heavy harmonic and high electromagnetic field environment of power plant control rooms.

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Category: SKU: ABB CMA135

Description

ABB CMA135

 

Technical Specifications & Core Performance Parameters

3.1 Physical Dimension & Weight

  • Overall size: 170 mm (Width) × 105 mm (Height) × 32 mm (Depth)
  • Net weight: 0.4 kg
  • Rack installation width: Single-width standard DCS plug-in module slot

3.2 Power Supply Parameters

  • Operating auxiliary power input: 24 VDC ± 20% industrial DC power
  • Rated power consumption: Max 5 W under full channel load
  • Built-in reverse power connection protection circuit, no hardware damage caused by positive-negative reversal wiring

3.3 Signal Channel Configuration

  • Total universal analog input channels: 16 isolated independent channels
  • Supported field sensor signal types:
    • Thermocouple: J, K, T, E, R, S, B, N types
    • RTD thermal resistor: Pt100, Pt1000, Cu50
    • Standard industrial current signal: 4–20 mA, 0–20 mA
    • Standard voltage signal: 0–5 VDC, 0–10 VDC, ±50 mV low-level thermocouple mV signal
    • Resistance potentiometer signal: 0–10 kΩ
  • Each channel carries independent 16-bit high-precision AD conversion chip
  • Measurement full-scale precision: ±0.15% FS; temperature drift ≤ 0.01%/°C

3.4 Isolation & Anti-Interference Index

  • Channel-to-system isolation voltage: 1500 VAC withstand voltage for 1 minute
  • Channel-to-channel independent galvanic isolation, no cross-talk between signal loops
  • Built-in multi-stage LC low-pass filter for each channel, suppress 50/60 Hz power frequency interference
  • Comply with IEC 61000-6-2 heavy industrial electromagnetic compatibility standard

3.5 Environmental Working Parameters

  • Continuous operating ambient temperature: -20 °C ~ +60 °C
  • Storage & transportation temperature: -40 °C ~ +85 °C
  • Relative working humidity: 5% – 95% RH, non-condensing environment only
  • Maximum allowable installation altitude: 2000 m above sea level
  • Anti-vibration standard: IEC 60068-2-6, 10–150 Hz continuous vibration resistance

3.6 Protection Grade & Certification

  • Shell protection rating: IP20, only for installation inside closed electrical control cabinet
  • Official certifications: CE, UL, RoHS, IEC 61010-1 low voltage safety standard, power industry anti-interference certification

3.7 Communication Interface

  • Internal backplane bus: ABB Advant dedicated MasterBus 300 high-speed DCS bus, 10 Mbps transmission rate
  • Optional external auxiliary communication: Onboard RS485 Modbus RTU interface for independent data uploading to third-party monitoring equipment

 

Function Characteristics

  1. Full-channel independent isolation designEvery analog input channel is equipped with separate optocoupler isolation unit, completely eliminate ground potential difference interference widely existing in power station multi-point grounding system, avoid signal distortion and measurement drift.
  2. Universal signal compatibility without external signal convertersOne single module supports all mainstream thermal, pressure and flow sensor signals used in power generation industry, reduce cabinet wiring accessories and save engineering procurement cost.
  3. Multi-level hardware & software dual filtering functionHardware LC filter suppresses high-frequency electromagnetic noise; software digital average filtering can be configured via DCS program to eliminate instantaneous signal fluctuation caused by generator vibration.
  4. Complete channel self-diagnosis systemAutomatically detect sensor open circuit, short circuit, signal over-range and power supply abnormality; corresponding front panel LED fault indicator lights up and upload fault codes to CMA126 main control module for DCS alarm display.
  5. Hot-swap support without system shutdownThe module adopts gold-plated elastic backplane contact structure, allowing technicians to replace faulty CMA135 boards during normal operation of power generation units without cutting off DCS control power.
  6. On-site visual status indicationFront panel integrates independent LED indicators for power supply running, bus communication normal, channel fault and over-range alarm, enabling maintenance staff to judge abnormal channels without upper computer login.
  7. Configurable signal engineering conversionInternal chip supports user-defined temperature unit conversion, pressure unit scaling and flow linear compensation, no extra calculation logic needed in main control program.
  8. Overvoltage & overcurrent hardware protection per channelEach signal input terminal installs TVS transient voltage suppression diode and PTC current-limiting fuse, prevent module circuit burnout caused by field wiring misconnection or lightning surge.

 

Material Composition

  1. Outer housing frameOrange flame-retardant PA66 engineering plastic shell, high impact resistance, anti-aging, anti-static surface coating; integrated elastic buckle structure for DCS rack fixing.
  2. Main circuit substrateMulti-layer high-temperature FR4 copper-clad PCB board, full-board lead-free tin anti-corrosion coating; gold-plated signal trace to reduce long-term contact resistance drift.
  3. Isolation componentsHigh-withstand voltage linear optocoupler isolation chips for each channel, built-in noise shielding metal casing.
  4. Wiring terminal assemblyNickel-plated copper alloy spring clamp screw terminals, anti-loose spring gasket, vibration-resistant tightening structure suitable for generator room long-term vibration environment.
  5. Conversion & storage componentsIndustrial-grade 16-bit AD sampling chips, 16 MB Flash memory for channel parameter storage, 8 MB RAM for real-time signal cache.
  6. Indicator light componentsHigh-brightness anti-interference LED light beads with anti-glare light cover, stable lighting under strong electromagnetic field.
  7. Backplane contact pinsSpring-type gold-plated copper pins, low contact resistance, stable electrical connection under long-term vibration.

 

Structural Features

  1. Standard single-width DCS rack plug-in structureOccupies one single slot of Advant series standard cabinet backplane, modular layout saves cabinet internal installation space, convenient for capacity expansion of signal acquisition channels.
  2. Front-rear partition layout designFront panel concentrates LED status indicators and auxiliary communication RS485 port; rear panel separates DCS backplane bus contact area and field sensor wiring terminal area, physical isolation between weak signal and internal high-speed bus to avoid signal crosstalk.
  3. Built-in passive natural heat dissipation channelVertical hollow air convection slots on upper and lower sides of plastic shell, no built-in cooling fan, eliminate fan failure risk in unattended power station control room.
  4. Integrated anti-vibration buffer structureRubber shock absorption gaskets between internal circuit board and plastic shell, reduce vibration transmission from generator unit to circuit components.
  5. Modular split wiring areaField signal terminals are divided into independent groups by channel number, clear printed channel number marks on terminal base, avoid wiring confusion during on-site maintenance.
  6. Lockable rack buckle mechanismTwo-side elastic plastic buckles on the module side, after inserting into DCS rack, the buckle automatically locks to prevent module loose displacement caused by equipment long-term vibration.

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