Component Snapshot At-a-Glance
- Model: CC-PAIX02
- Alt. P/N: CC-PAIH02 (pinout incompatible upgrade variant); legacy MC-PAIH03 (TDC3000 HPM platform, non-interchangeable)
- Product Series: Honeywell Experion PKS Series C I/O, paired with C300 Process Controllers
- Hardware Type: Rack-mount analog input module, hot-swap capable, requires dedicated IOTA terminal base
- Key Feature: 16 mixed single/differential isolated channels with native HART 5/7 demodulation and per-channel loop diagnostics
- Primary Field Use: Capture 4–20mA / voltage analog signals from HART smart transmitters for SIL2 rated monitoring and control loops.
Hard-Numbers: Technical Specifications
- Protocol Support: Series C I/O backplane bus, HART 5 / HART 7, chassis diagnostic telemetry
- Port Count: 16 analog field channels (12 single-ended, 4 differential); gold finger backplane connector; mates to IOTA wiring base
- Baud/Data Rate: Fixed 50ms system scan cycle; HART digital modulation superimposed on analog current loop
- Operating Temperature: 0°C to +60°C cabinet operational; -40°C to +85°C storage
- Isolation Rating: 1500Vrms channel-to-backplane isolation, independent galvanic separation per channel
- Power Draw: 24VDC ±10% rack supply, typical module power draw 5W
- ADC Resolution: 16-bit delta-sigma analog-to-digital conversion
- Input Signal Ranges: Software selectable 4–20mA, 0–5V, 1–5V, 0.4–2V
- Safety Rating: IEC 61508 SIL2 certified, ATEX Ex ec IIC T4 Zone 2 cabinet compliant
- Concurrent HART Nodes: Supports up to 16 individual HART instrument devices per card
- Physical Weight: 0.5kg single module assembly
The Real-World Problem It Solves
Older 8-channel analog input cards eat critical rack cabinet space and share signal amplifiers between channels. VFD and motor EMI cross-talk causes noisy PV readings and false process trips without full per-channel isolation.Third-party HART multiplexers add extra hardware, introduce additional wiring fault points, and require separate spare part inventory for maintenance.Where you’ll typically find it:
- Refinery HIPPS high-pressure safety loops with HART pressure and level transmitters
- Fossil power plant boiler furnace pressure, feedwater flow SIL2 monitoring I/O racks
- Chemical separation unit DCS panels with smart temperature transmitters and process analyzersThis high-density isolated AI card eliminates external HART multiplex hardware, meets SIL2 safety requirements, and blocks industrial EMI interference to stabilize analog measurement values.
Hardware Architecture & Under-the-Hood Logic
This card carries a dedicated on-board signal processing ASIC with fully isolated conditioning circuits for every channel; no shared analog hardware between input paths to prevent cross-talk.
- Field 4–20mA or voltage signals enter the paired IOTA base, pass reverse polarity fuses and current-limiting resistors before isolation transformers.
- Precision 250Ω shunt resistors convert loop current to scaled voltage for the 16-bit delta-sigma ADC sampling circuit.
- Independent HART demodulator chips extract digital device diagnostic data without distorting the primary analog process variable.
- Continuous threshold comparison logic flags open wire, short circuit, reverse polarity, and HART communication loss for each channel.
- Isolated Series C backplane transceiver transmits validated PV values, secondary HART variables, and fault codes to the C300 controller without backplane noise bleed-through.
- Front panel multi-color LED array shows module run status, individual channel faults, HART bus activity, and redundant pair health for quick cabinet troubleshooting.
Field Service Pitfalls: What Rookies Get Wrong
Mixing Unshielded Control Cable For HART Field Runs
New techs pull standard unshielded twisted pair for transmitter wiring to cut material costs. VFD cabinet EMI corrupts HART digital signals, triggering random “HART comm loss” alarms while analog PV remains stable.Quick Fix: Use foil-shielded instrument cable for all 4–20mA HART loops; terminate shield drain wire only at the IOTA cabinet side, tape and isolate field end shield from ground.
Overloading Single Card With More Than 16 HART Instruments
Apprentices daisy-chain 20+ HART transmitters to one CC- card, exceeding the 16 device limit. HART polling latency spikes, diagnostic data stops updating, and sporadic channel fault codes populate the DCS event log.Field Rule: Cap HART device count at 14 per card to leave headroom for maintenance polling; split dense transmitter clusters across separate AI modules.
Skipping Redundant IOTA Base Wiring For SIL2 Critical Loops
Many crews install single IOTA bases instead of matched redundant IOTA hardware for safety loops. If one card fails, the process monitoring point drops offline with no automatic failover path.Field Rule: All rated monitoring loops require dual CC- modules paired with redundant IOTA terminal bases; verify bumpless switchover during annual proof testing.
Commercial Availability & Pricing Note
Please note: The listed price is for reference only and is not binding. Final pricing and terms are subject to negotiation based on current market conditions and availability.
