Product Core Brief

• Model: CC-PAIM01 (OEM PN: 51304589-100)
• Brand: Honeywell
• Series: Experion PKS C300 Series-C Low-Level Multiplex AI
• Core Function: Multiplex low-level thermocouple, RTD, and millivolt signals for furnace, reactor, and heat-treat temperature monitoring
• Product Type: Multiplexed Low-Level Analog Input IOM
• Key Specs: 32 multiplexed channels | 24-bit sigma-delta ADC | 1500V channel-backplane isolationNote: Discontinued end-of-life hardware, stocked only as unopened New Surplus inventory.

Key Technical Specifications

• Supported Field Signals: J/K/T/E/R/S/B/N thermocouples, Pt100/Pt1000 RTDs, ±10mV to ±100mV low-level strain gauge signals
• Channel Count: 32 total, grouped into four 8-channel multiplex banks
• A/D Resolution: 24-bit sigma-delta per channel
• Measurement Accuracy: ±0.05% span for mV; ±0.1°C for RTD; ±1.0°C typical for thermocouples
• Galvanic Isolation: 1500VAC channel-to-backplane, channel-to-channel separation
• Supported IOTA Bases: Simplex CC-TAIM01 (6in), Redundant CC-TAIM11 (12in)
• HART Capability: Sequential HART polling enabled for compatible smart temperature transmitters
• Per-Channel Diagnostics: Open wire, shorted sensor, cold-junction offset drift, overload detection
• Backplane Operating Voltage: 18VDC to 36VDC nominal 24VDC
• Total Module Power Draw: 5.3W at full 32-channel scan load
• Ambient Operating Temperature: -40°C minimum to +70°C maximum cabinet temperature
• Hazardous Location Approval: FM Class I Div 2 Groups A/B/C/D cabinet mounting
• Physical Dimensions: 260mm H × 52mm W × 175mm D; net weight 0.38kg

Product Introduction

This multiplexed unit consolidates 32 low-level temperature sensor inputs into a single rack slot, eliminating multiple single-point low-density cards for high-count furnace and distillation temperature arrays. Its high-impedance input front-end eliminates signal attenuation on long thermocouple extension wiring.Sequential channel scanning reduces backplane bus bandwidth load by 65% compared to parallel 16-channel low-level IOM hardware, while built-in cold-junction compensation circuitry removes external reference junction hardware requirements.

QA & Testing SOP (Transparency Building)

1. Incoming Inspection: Cross-reference serial barcodes against Honeywell OEM batch logs; inspect PCB for solder cracking, bent edge connectors, and broken multiplexer traces; verify factory anti-static bag seal integrity.
2. Live Testing: Mate with matching TAIM-series IOTA on a bench C300 rack powered by a Fluke 115 regulated 24VDC supply; run 24-hour cyclic temperature ramp testing with simulated open/short sensor fault injection across all 32 channels.
3. Electrical Testing: Megger insulation test >10MΩ between every sensor channel and rack backplane; confirm cold-junction compensation offset stays within ±0.2°C across operating temperature range.
4. Firmware/Config Backup: No local onboard firmware; capture high-resolution photos of bank selection jumpers and thermocouple type default settings for field service reference.
5. Final QC & Packaging: Attach serialized printed test pass tag; seal the unit in foam-lined static-shielded bag to protect edge multiplex connectors during warehouse storage.

Installation Pitfalls & Guide (Engineer to Engineer)

❗ Firmware Rev Compatibility Risk: Experion PKS R400 and older releases lack full cold-junction drift diagnostic logic; upgrade rack controller firmware to R410+ before swapping hardware to avoid unreported temperature measurement drift faults.❗ Jumper Configuration Loss: Capture high-res photos of bank multiplex jumpers on the removed old unit; misconfigured group select jumpers lock out entire 8-channel sensor banks from control strategy scans.❗ Wiring Incompatibility: This hardware cannot substitute CC-PAIL51 single-channel low-level IOM without full sensor harness retermination; parallel non-multiplexed IOTAs have incompatible pinout layouts.❗ Loop Resistance Miscalculation: Thermocouple extension wire total resistance exceeding 120Ω introduces permanent cold-junction offset error; install signal trim amplifiers for field runs longer than 600 meters.❗ ESD Component Damage: Ungrounded technicians have destroyed multiplexer ADC chips during hot-swap attempts; latent damage creates slow temperature drift that only surfaces after 3–5 weeks of continuous runtime.

4-step replacement guide:

1. Pre-install: Activate cabinet LOTO on 24VDC field power; secure grounded anti-static wrist strap to DIN rail ground lug.
2. Removal: Document jumper bank positions via photo; unlatch the unit from its TAIM-series IOTA base, disconnect inter-module Type5 ribbon cable segment by segment.
3. Install: Seat new hardware fully onto matching TAIM-series termination base, replicate all jumper bank settings from reference photos, lock ribbon cable connectors until audible engagement click.
4. Power-on Test: Restore field power; open Control Builder diagnostic screens to confirm zero active open/short sensor faults and stable cold-junction temperature readings across all 32 multiplex channels.

FAQ (Frequently Asked Questions)

Q: Can this module run mixed thermocouple and RTD sensor types on separate multiplex banks?A: Yes. Each 8-channel multiplex bank uses independent IOTA jumpers to select TC or RTD input mode. Mixing sensor types across different banks requires matching jumper settings for each group; same-bank mixed sensor types will produce invalid temperature readings.Q: Does the hardware support hot-swapping while the C300 rack remains energized?A: The IOM itself supports rack hot-swap, but field 24VDC power must be fully isolated before disconnecting the IOTA ribbon cable. Live field power disconnection induces voltage transients that damage the multiplexer’s analog front-end circuits.Q: What warranty coverage applies to bench-tested surplus stocked units?A: All inventory units carry a 12-month functional warranty covering factory PCB, multiplexer, and ADC circuit defects. Damage from field overvoltage surges, misconfigured bank jumpers, or ungrounded ESD handling is excluded from all coverage terms.Q: Is there a direct drop-in modern replacement for this discontinued hardware?A: Current Series-C universal I/O modules integrate low-level multiplex functionality, but full sensor harness retermination and Control Builder temperature logic revalidation is mandatory; multiplex scan timing and cold-junction compensation logic do not match for unmodified direct swap.Q: What maximum total extension wire resistance can each thermocouple channel tolerate without measurement offset?A: The high-impedance input stage tolerates up to 120Ω total wire resistance per thermocouple channel. Runs exceeding this threshold generate permanent cold-junction temperature offset errors that cannot be corrected via software trim.Q: Can this hardware be paired with high-level 4–20mA transmitters in the same multiplex bank?A: No. The multiplex front-end is hardwired for millivolt low-level signals only; connecting 4–20mA current transmitters overloads the ADC and permanently burns out the bank multiplexer chips within minutes of power application.Q: Can a simplex CC-TAIM01 IOTA be repurposed for redundant rack pair deployments?A: No. Simplex termination bases lack dual isolated field wiring buses and cross-check signal routing required for 1:1 redundant IOM pairs. Redundant temperature monitoring racks must use CC-TAIM11 to maintain full fault coverage for IEC 61511 compliance.