Product Core Brief

• Model: CC-TAIX11 (OEM PN: 51308365-175)
• Brand: Honeywell
• Series: Experion PKS C300 Series-C Analog Input Redundant IOTA
• Core Function: 12-inch dual-path redundant termination assembly to wire 4–20mA / voltage HART transmitters for paired primary/backup analog IOM redundancy
• Product Type: Redundant Analog Input IOTA (Input Output Termination Assembly)
• Key Specs: 16 field channels | Dual isolated signal buses | 250Ω precision shunts | Built-in HART filteringNote: Discontinued end-of-life hardware, stocked only as unopened New Surplus inventory.

Key Technical Specifications

• Compatible IOM Models: CC-PAIN01 universal mixed-signal AI, CC-PAIH51 current-only HART AI
• Physical Form Factor: 12-inch redundant IOTA; simplex equivalent = CC-TAIX01 (6-inch)
• Supported Field Signals: 4–20mA two-wire HART transmitters, 0–5V / 1–5V single-ended voltage sensors
• Channel Count: 16 independent field channels, dual mirrored signal paths for redundancy
• Onboard Circuitry: Per-channel 250Ω precision shunt resistors, EMI RC filters, transient surge suppression, HART signal couplers
• Terminal Style: Spring compression screw terminals; rated for AWG16–22 solid/stranded wire
• Common Mode Rejection: 70dB DC to 60Hz with up to 500Ω source imbalance
• Input Filter Response: Single-pole RC, -3dB cutoff at 6.5Hz to suppress VFD switching noise
• Backplane Operating Voltage: 18VDC to 36VDC nominal 24VDC rack supply
• Ambient Operating Temperature: -40°C minimum to +70°C maximum cabinet ambient
• Hazardous Location Approval: FM Class I Div 2 Groups A/B/C/D cabinet mounting certified
• Environmental Coating: Full conformal coated PCB for corrosive refinery/offshore cabinet environments
• Physical Dimensions: 305mm H × 52mm W × 170mm D; net weight 0.41kg

Product Introduction

This dual-path termination base delivers fully mirrored field signal routing to support 1:1 redundant analog IOM pairs for critical continuous-process control loops. Separate isolated signal buses for primary and backup electronics eliminate cross-talk between redundant measurement paths.Integrated HART couplers and precision shunts remove external signal conditioning hardware from marshalling cabinets, while dual surge suppression networks prevent single field faults from disrupting both redundant measurement legs.

QA & Testing SOP (Transparency Building)

1. Incoming Inspection: Match serial barcodes against OEM factory batch manifests; inspect PCB for cracked traces, bent edge connectors, and damaged terminal lugs; verify factory anti-static bag seal integrity.
2. Live Testing: Mate with paired CC-PAIN01 redundant IOMs on a bench C300 rack powered by a Fluke 115 regulated 24VDC supply; run 24-hour cyclic 4–20mA ramp testing with simulated open/short faults injected to both redundant signal paths.
3. Electrical Testing: Megger insulation test >10MΩ between each field channel and both IOM connector buses; confirm matched resistance across dual redundant signal legs with a precision multimeter.
4. Firmware/Config Backup: No onboard local firmware storage; capture high-resolution photos of channel mode jumpers for field service reference before bench testing.
5. Final QC & Packaging: Attach serialized printed test pass tag; seal unit in foam-lined static-shielded bag to protect dual edge connector pins during warehouse storage and transit.

Installation Pitfalls & Guide (Engineer to Engineer)

❗ Firmware Rev Compatibility Risk: Experion PKS R401 and newer releases enforce stricter redundant path mismatch alarms; lock rack controller firmware to R400 or older before swapping this base to avoid constant minor fault alerts.❗ Jumper Configuration Loss: Capture high-res photos of signal type jumpers on the removed old unit; mismatched current/voltage jumpers break redundant PV matching and trigger frequent spurious failover events.❗ Wiring Incompatibility: This redundant base pinout does not interchange with simplex CC-TAIX01; swapping without full harness retermination disables one leg of the redundant measurement pair entirely.❗ Loop Resistance Miscalculation: Combined wire + transmitter resistance exceeding 650Ω collapses full-scale 20mA signals; install inline signal booster supplies for field runs longer than 800 meters.❗ ESD Component Damage Risk: Ungrounded technicians have destroyed dual-path HART filter circuits during IOM swap-outs; latent damage creates unbalanced redundant signal readings that surface after 2–3 weeks of 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 signal settings via photo; unlatch both primary and backup IOMs from the base, disconnect Type5 inter-module ribbon cables sequentially, remove all field wiring channel by channel.
3. Install: Mount new hardware to rack rail, replicate all jumper configurations from reference photos, reterminate field wiring to matching channel terminals, fully seat and lock both redundant IOM units onto the dual connector bus.
4. Power-on Test: Restore field power; open Control Builder diagnostic screens to confirm identical PV readings across primary/backup IOMs with zero path mismatch or open-loop fault flags active.

FAQ (Frequently Asked Questions)

Q: Can this redundant IOTA be used with a single simplex analog IOM for non-critical monitoring loops?A: It is physically compatible but wastes the dual isolated signal bus design. Simplex deployments should use the smaller CC-TAIX01 to reduce cabinet space and spare part inventory overhead.Q: Does the assembly support hot-swapping of paired IOMs while the C300 rack remains energized?A: The IOM electronics support rack hot-swap, but field 24VDC power must be isolated before disconnecting either ribbon cable from the base. Live field power disconnection induces voltage transients that damage the dual HART filter networks on the PCB.Q: What warranty coverage applies to bench-tested surplus stocked units?A: All inventory units carry a 12-month functional warranty covering factory PCB, dual signal bus, and terminal circuit defects. Damage from field surge overload, misconfigured signal jumpers, or ungrounded ESD handling is excluded from coverage terms.Q: Is there a direct drop-in modern replacement for this discontinued termination hardware?A: Current Series-C universal redundant IOTAs integrate matching dual-path signal routing, but full field harness retermination and Control Builder redundant loop logic revalidation is mandatory; dual bus impedance and HART coupling timing do not match for unmodified direct swap.Q: What fault isolation do the dual surge suppression networks provide during field wiring shorts?A: Independent surge filtering on each redundant signal leg ensures a shorted field channel only impacts one measurement path; the paired backup IOM maintains valid PV values without process loop interruption, a core requirement for IEC 61511 critical control loop fault tolerance.Q: Can mixed CC-PAIN01 and CC-PAIH51 IOMs be installed as a redundant pair on this base?A: Not supported. Mixed-signal IOM pairs create unbalanced A/D conversion timing between primary and backup hardware, triggering continuous redundant path mismatch alarms and unstable closed-loop PID regulation. Identical model IOMs are required for valid redundant deployments.Q: Can this termination base connect to low-level TC/RTD multiplex IOM hardware like CC-PAIM01?A: No. The dual signal bus and onboard 250Ω shunt resistors are engineered exclusively for high-level 4–20mA / voltage transmitters. Low-level millivolt sensor hardware requires separate TAIM-series IOTAs with dedicated cold-junction compensation circuitry.