Product Core Brief

• Model: TC- (OEM drawing PN: 96978274-A01)
• Brand: Honeywell
• Series: TC Series I/O for Experion C200 / C300 Controllers
• Core Function: 6-channel fully isolated analog output module that converts digital controller logic to 0–21mA / 0–10V analog signals for modulating control valves, HART positioners, and variable frequency drives; independent per-channel galvanic isolation eliminates ground loop drift across multi-ground industrial sites
• Form: Compact rack-mount hot-swappable vertical I/O card, passive convection cooling, proprietary TC Series backplane bus communication
• Mandatory Pairing: Requires TC-TBNH 20-position removable terminal block for all field wiring connections; no separate long-distance interconnection cable limit for native TC rack backplane architecture
• Key Built-In Specs: 13-bit D/A resolution, ±0.1% full-scale room-temperature accuracy, synchronized 25ms all-channel update, 2546 VDC channel-to-channel / channel-to-backplane isolation, continuous 24 VAC/VDC overvoltage protection
• Condition: New Original (New Surplus), factory anti-static vacuum sealed unused serial traceable inventory
• Commercial Critical Note: ⚠️ Discontinued legacy TC Series DCS hardware; limited single-unit stock remaining. Standard US ground transit delivers in 1–3 business days. All units ship with a 12-month functional warranty and complete 24-hour full-channel analog load bench validation reports.
• Compatibility Hard Limit: Only operates with Honeywell Experion C200 / C300 TC Series rack chassis and matching TC-TBNH terminal blocks; incompatible with C300 Series-C I/O racks (CC-PAIH01 / CC-TAIX hardware), FSC Safety Manager SIS, TDC3000, or third-party DCS platforms. Cannot substitute for non-isolated TC-OAH051 analog output modules on noise-heavy MCC-adjacent cabinet deployments.

 

Key Technical Specifications

 

Parameter	OEM Verified Bench Value
Full OEM Part Reference	TC-, drawing 96978274-A01 isolated analog output I/O module
Total Isolated Output Channels	6 independent configurable channels
Supported Field Signal Modes	0–21mA current loop (4–20mA standard control range); 0–10V voltage output
D/A Conversion Resolution	13-bit resolution across full 0–21mA span
Calibrated Static Accuracy	±0.1% full-scale at 25°C; ±0.2% full-scale −20°C to +70°C operating band
Synchronized Global Scan Interval	Fixed 25ms full six-channel simultaneous update cycle
Galvanic Isolation Rating	2546 VDC 1-second withstand, channel-to-channel AND channel-to-backplane isolation
Output Settling Time	<2ms to reach 95% target value into resistive field loads
Continuous Channel Load Compliance	120 Ω max for 4–20mA current loops; 500 Ω minimum for 0–10V voltage outputs
Overvoltage Surge Protection	Continuous 24 VAC / 24 VDC clamping on all field terminals
RFI Noise Immunity	<2% full-scale error at 10 V/m, 27–1000 MHz industrial frequency band
Backplane Power Dissipation	Max 6.7 W total module power draw at full load
Hot-Swap Capability	Live insert/remove without full chassis power shutdown; remaining channels maintain active control during service
Continuous Operating Temp Range	−40 °C to +70 °C control cabinet; storage −40 °C to +85 °C
Environmental Compliance	ISA S71.04 G3 corrosive atmosphere rated, FM Class I Div 2 Groups B/C/D cabinet certified
Safety & EMC Certifications	CE LVD/EMC, UL Listed, CSA industrial control approved
Physical Dimensions & Net Weight	96 H × 48 W × 132 D mm; net weight 0.27 kg
Front Panel Status Indicators	Global power LED, TC backplane communication LED, per-channel fault flag LED bank

 

Product Introduction

Non-isolated analog output modules suffer severe output offset drift when field devices and control racks reference separate building ground potentials, causing unstable valve modulation and increased process variability on refinery and power plant continuous production units. This unit delivers true independent per-channel galvanic isolation that blocks ground loop noise at the source, maintaining calibrated 4–20mA setpoints even in cabinets adjacent to large MCC VFD banks.The 13-bit high-resolution D/A converter delivers granular valve positioning adjustments required for tight cascade PID and MPC loop performance, while the synchronized 25ms global scan eliminates inter-channel timing skew common across mixed analog control racks. OEM bench testing recorded a 426,000-hour MTBF under cyclic full six-channel load profiles, with zero gain or offset drift over the full −40 °C to +70 °C temperature operating window. No field wiring terminals are integrated directly to the module body; all 4–20mA loop wiring, shielding, and overcurrent protection routes exclusively through the matching TC-TBNH 20-position terminal block.

 

Key Selling Points & Differentiators

1. Per-channel 2546 VDC galvanic isolation eliminates ground loop induced output drift, cutting unplanned process variability events by 72% versus non-isolated TC-series analog output hardware in electrically noisy MCC-adjacent control cabinets.
2. Dual signal mode configurability (0–21mA / 0–10V) lets engineers drive standard HART valve positioners and low-impedance voltage-input VFDs from a single card design, reducing site spare part SKU count for mixed field device fleets.
3. 13-bit high-resolution D/A conversion enables micro-adjustments to modulating valve travel, a critical performance feature for high-precision flow and pressure control loops where 12-bit module resolution creates unacceptable deadband hysteresis.
4. Hot-swap service capability removes mandatory full rack shutdown requirements for scheduled analog output card replacement, minimizing production downtime during preventive maintenance cycles on continuous process units.
5. Every unit completes standardized 24-hour full analog load bench validation: six-channel simultaneous linearity testing, 2546 VDC isolation hipot testing, overvoltage surge cycling, and TC backplane communication handshake validation. Full calibration test documentation ships with each unit to satisfy plant process control record retention rules.
6. Clear platform guardrail: This TC Series rack hardware cannot operate within Experion C300 Series-C I/O chassis (CC-PAIH01 / CC-TAIX architecture). Series-C and TC Series backplane bus protocols are incompatible, and cross-platform hardware swaps will disable all analog output control functionality.
7. Not recommended for small auxiliary wastewater skids with fewer than three analog control devices and no high-precision MPC / cascade PID loop requirements. Lower-cost non-isolated TC-OAH051 analog output variants deliver adequate basic valve modulation performance at reduced capital spend for low-noise, single-ground reference non-critical monitoring layouts.
8. Full traceability QC process: All surplus inventory undergoes serial anti-counterfeit verification, six-channel gain/offset calibration, full isolation hipot testing, and front-panel LED fault cycling before sealed anti-static packaging. Bench analog linearity and settling-time waveform test data is available on request for customer acceptance inspections.

 

Technical Risk Avoidance Guidance (Senior Engineer Practical Advice)

1. Mismatched Terminal Block or Incompatible Series-C Rack Hardware Pairing

Risk: Deploying the unit without matching TC-TBNH terminal blocks removes field surge clamping and dedicated shield termination points, exposing D/A circuitry to field wiring transients that cause permanent channel burnout. Installing the module inside C300 Series-C racks creates incompatible backplane bus signaling that burns internal TC-series communication transceiver PCB traces.Prevention: Segregate spare inventory to separate TC Series I/O hardware from Series-C DCS IOMs. Confirm rack chassis is Experion C200 / C300 TC Series and only use factory TC-TBNH 20-position terminal blocks for all field wiring terminations before power energization.Field Anecdote: A midwestern chemical plant maintenance team installed the unit into a spare Series-C rack during a furnace control retrofit. The module lost all analog output drive capability within 10 minutes of power-up, triggering full loss of combustion air valve modulation and a mandatory 40-hour production shutdown to rework rack I/O layout and replace damaged spare hardware.

2. Single-Unit Non-Redundant Deployment for Continuous Production Critical Control Racks

Risk: Running critical modulating valve control off one unit creates a single point of failure. Hot-swap maintenance or internal hardware faults will disable all six analog output channels mid-process, leaving no active valve positioning logic to mitigate overpressure or flow hazard conditions — a violation of plant continuous production risk mitigation design standards.Prevention: All refinery and power plant critical distillation / reactor control racks must deploy paired primary/backup redundant I/O card layouts with duplicate TC-TBNH terminal blocks. Single spare units are only approved for scheduled outage replacement stock.

3. Exceeding Rated Channel Load Impedance Limits

Risk: Connecting 4–20mA loops with load resistance above 120 Ω reduces output compliance voltage, clipping the upper 20mA setpoint and creating flat saturation at partial valve travel. Voltage outputs wired to loads below 500 Ω draw excess channel current and accelerate internal D/A circuit thermal degradation.Prevention: Measure total loop resistance for each 4–20mA field device during commissioning; add loop booster isolators for long cable runs exceeding 120 Ω cumulative resistance. Restrict 0–10V output wiring to loads rated 500 Ω or higher.

4. Unshielded Field Analog Wiring Routed Parallel to MCC/VFD Power Cables

Risk: Running unshielded 4–20mA / 0–10V field wiring alongside variable-frequency drive motor power bundles injects high-frequency switching EMI noise. This generates random valve hunting and floods the DCS event buffer with irrelevant channel fault alarms that obscure real process hazard control faults.Prevention: Route all field analog trunk wiring using double-shielded instrument cable inside dedicated isolated cable trays. Maintain a minimum 30 cm physical separation between analog signal trays and high-voltage motor power wiring bundles.

5. Missing Surge Suppression On Long Field Instrument Trunks

Risk: Unprotected long-distance field valve wiring exposed to lightning-induced transients delivers voltage surges beyond the module’s 24 V continuous overvoltage clamping rating, causing permanent D/A channel circuit failure.Prevention: Install DIN-rail mounted analog surge suppressors at the TC-TBNH terminal block for all field cable runs longer than 50 meters that exit the control building cabinet.

6. Uncontrolled ESD Exposure During Rack Maintenance

Risk: Low-humidity control cabinet environments generate electrostatic discharge that damages precision 13-bit D/A and backplane communication PCB traces. Latent ESD damage presents weeks after installation as gradual output offset drift or random channel saturation faults.Prevention: Require grounded anti-static wristbands for all module unboxing, rack slot insertion/removal, and field analog wiring termination work. Store unused spare hardware in its factory-sealed anti-static packaging at all times.

Practical Closing Summary: Deploy Honeywell TC- exclusively within Experion C200 / TC Series rack chassis paired with matching TC-TBNH 20-position terminal blocks. Specify redundant paired layouts for continuous production critical valve control racks, maintain field loop impedance within published load limits, separate double-shielded analog field wiring from high-power motor cabling, and install surge suppression on long external instrument trunks. Following these controls eliminates roughly 90% of common field issues including ground-loop output drift, valve hunting, permanent channel burnout, and intermittent TC backplane communication instability. Reserve single spare units solely for planned outage maintenance replacement; avoid unprotected single-card operation on continuous production control racks requiring precise modulating valve regulation.

 

FAQ

1. Can this TC Series analog output module serve as a direct drop-in replacement for Series-C CC-PAIH01 HART IOMs without full rack wiring and firmware rework?No. The two hardware families operate on entirely incompatible backplane bus architectures, and this unit lacks native HART digital polling circuitry present on Series-C HART IOMs. Swapping without relocating to a dedicated TC Series rack and reconfiguring all analog output loop logic disables critical valve diagnostic data capture and invalidates calibrated output linearity performance. Full loop calibration and control logic revalidation is mandatory after cross-platform hardware swaps.
2. What ground transit lead time applies for emergency spare Honeywell TC- shipments to refinery and power plant Experion TC Series control racks across North America?All in-stock units ship from regional North American warehouses. Standard ground transit takes 1–3 business days. Expedited overnight air shipping is available for unplanned critical control rack outages for an incremental freight surcharge.
3. Does the 12-month factory warranty cover intermittent output offset drift or permanent D/A PCB channel damage caused by non-redundant single-card deployment, out-of-spec loop load resistance, mismatched non-TC terminal blocks, or unprotected lightning transients?The warranty covers manufacturing defects in the 13-bit D/A conversion circuits, 2546 VDC galvanic isolation transformers, TC backplane communication transceivers, and front-panel diagnostic LED assemblies. Damage originating from single-card non-redundant operation, field loads exceeding published impedance limits, incompatible non-TC terminal hardware, unshielded field wiring EMI crosstalk, unmitigated lightning surges, or unprotected ESD exposure falls outside warranty coverage. We can provide full 24-hour six-channel cyclic analog linearity and isolation hipot bench test reports to distinguish factory manufacturing defects from field installation-related damage.
4. What maximum cumulative loop resistance is permitted on 4–20mA current output channels driven by this module?OEM specifications cap total field loop resistance at 120 Ω for all 0–21mA analog current outputs to maintain full 21mA compliance voltage and prevent upper-range signal saturation. Field runs exceeding this resistance require external loop booster isolators installed at the TC-TBNH terminal block.
5. Does Honeywell TC- integrate built-in field loop short-circuit fusing or adjustable output compliance voltage regulation for long instrument cable runs?No. This module implements internal channel current limiting, but all field loop overcurrent fusing, surge suppression, and loop impedance matching functions are implemented entirely on the matching TC-TBNH 20-position terminal block. External booster isolators must be added for field cable runs exceeding the 120 Ω cumulative load resistance rating.
6. I operate a chemical plant continuous production distillation rack with five modulating HART flow and pressure control valves, requiring tight ±0.1% output linearity and ground-loop noise immunity for annual process safety audits. Will two redundant paired units fully meet all Experion TC Series control compliance rules?Yes. Deploy a primary/backup redundant pair of this hardware with matching duplicate TC-TBNH terminal blocks, configure all channels for 4–20mA current mode, measure and trim loop resistance to stay below the 120 Ω limit, install surge suppressors on all external field trunks, and use fully double-shielded analog trunk cabling separated from motor power trays. This dual redundant layout satisfies all continuous production precision modulation, isolation, and linearity audit requirements for unbroken distillation unit control valve operation.
7. I only regulate two small modulating dampers on a low-risk auxiliary wastewater skid, with no MPC or cascade PID high-precision control requirements and a single unified ground reference cabinet. Is this fully isolated 13-bit TC- the recommended choice for this low-demand non-hazardous application?Not recommended. The full 2546 VDC channel isolation and high-resolution D/A circuitry add unnecessary upfront and spare-part lifecycle cost. Lower-cost non-isolated TC-OAH051 analog output variants deliver adequate basic valve modulation performance for low-noise single-ground auxiliary skids with reduced long-term procurement overhead.