Honeywell CC-TAOX11 51308353-175 Analog Output Module – Experion PKS C300

Honeywell CC-TAOX11 51308353-175 — Single-Channel Analog Output CHARM Module for Experion PKS C300

In continuous process industries, the integrity of each analog output channel is not a secondary concern — it is the direct determinant of whether a control valve responds to its setpoint within the required scan cycle. The Honeywell CC-TAOX11 (P/N 51308353-175) is a single-channel Characterization Module (CHARM) designed for the Experion PKS C300 distributed control system. Its architecture places the signal conditioning, isolation barrier, and HART modem at the field termination point rather than in a centralized I/O card, fundamentally changing how analog output loops are managed, diagnosed, and maintained in large-scale process plants.

The CC-TAOX11 generates a 4–20 mA current-loop output with 16-bit D/A resolution, providing a theoretical output step of approximately 0.24 µA — sufficient for tight control of modulating valves, variable-speed drives, and electropneumatic positioners in applications where loop gain and deadband tolerances are measured in fractions of a percent. The module mounts directly onto a CHARM I/O Base (CIOM-A or CIOM-B), drawing its configuration from the C300 controller’s I/O database without requiring manual DIP-switch or jumper configuration.

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Technical Parameters

Hardware Logical Analysis

The CC-TAOX11 departs from the conventional multi-channel I/O card model by embedding all signal-path components — D/A converter, output driver, HART modem, and isolation transformer — within a single CHARM housing approximately 12 mm wide. This physical consolidation has direct consequences for system reliability and fault containment.

Galvanic Isolation Architecture: Each CC-TAOX11 implements transformer-based galvanic isolation between the C300 backplane bus and the field loop. The isolation barrier sustains a minimum of 500 V DC working voltage between the control-side logic and the field-side current loop. This prevents ground loops — a persistent source of measurement error and equipment damage in plants where field instruments share common grounding with motor drives or high-voltage switchgear. The isolation is not shared across channels, as each CHARM is a discrete module; a ground fault on one loop cannot propagate to adjacent loops through a shared isolation stage.

HART Modem Integration: The onboard HART modem operates at the standard 1200/2200 Hz FSK frequencies superimposed on the 4–20 mA carrier. The modem interfaces directly with the Experion FDM (Field Device Manager) via the C300 backplane, enabling full HART 7 command set execution — including device description (DD) downloads, dynamic variable mapping, and burst mode configuration — without requiring a separate HART multiplexer or handheld communicator for routine diagnostics. This reduces the hardware count in the marshalling cabinet and eliminates the latency introduced by external HART infrastructure.

EMC Design: The CHARM housing incorporates shielded PCB layers and ferrite-based common-mode filtering on the field terminals. Conducted emissions are suppressed to comply with IEC 61000-6-4 (industrial emission standard), and immunity to radiated fields meets IEC 61000-6-2 at 10 V/m across the 80 MHz–1 GHz band. In practice, this means the module maintains output accuracy within specification in environments with variable-frequency drives, high-current bus bars, and radio transmitters operating in close proximity — conditions that are standard in refinery and power plant control rooms.

Fail-Safe Output Behavior: On loss of communication with the C300 controller — whether due to a controller fault, network interruption, or planned maintenance — the CC-TAOX11 transitions its output to a pre-configured fail-safe state. The fail-safe value is stored in non-volatile memory within the CHARM and is applied within one scan cycle of detecting the communication loss. The fail-safe state can be configured as hold-last-value, drive-to-low (3.6 mA), or drive-to-high (21 mA), giving process engineers the flexibility to define safe states appropriate to each specific control loop.

System Integration Benefits

• Per-Channel Hot-Swap Without Process Interruption: The CHARM architecture allows a technician to extract and replace a CC-TAOX11 while the C300 controller and all adjacent output channels remain in automatic mode. The affected channel transitions to its fail-safe state during the swap — typically less than 30 seconds — and resumes normal operation immediately upon reinsertion and re-initialization. This eliminates the planned shutdown windows that multi-channel card replacements require.
• Deterministic Scan Cycle Performance: The CC-TAOX11 updates its output register synchronously with the C300 controller scan cycle, which is configurable from 50 ms to 1000 ms. Because the D/A conversion and output driver settle within 5 ms of receiving a new setpoint, the module does not introduce additional latency into the control loop — the output tracks the controller’s calculated manipulated variable within a single scan period.
• Integrated Loop Diagnostics Without External Hardware: The module continuously monitors output current against the commanded value. A deviation exceeding ±0.5 mA from the setpoint — indicating an open-circuit field wire, a failed positioner, or a saturated loop — generates a diagnostic alarm at the Experion operator station within one scan cycle. This eliminates the need for periodic manual loop checks and reduces the mean time to detect (MTTD) for field wiring faults from hours to seconds.
• Universal Field Wiring Compatibility: The CC-TAOX11 accepts standard 0.5 mm² to 2.5 mm² field cables on its screw-terminal CHARM base. Existing field wiring from legacy marshalled I/O systems can be reconnected directly to the CIOM base without re-pulling cables — a significant cost reduction in brownfield DCS migration projects where cable replacement can represent 30–50% of total project cost.
• HART Asset Management Integration: With HART 7 pass-through active, the Experion FDM can execute scheduled device health checks, retrieve process variables from multi-variable transmitters, and push firmware updates to smart positioners — all through the existing 4–20 mA loop wiring. This consolidates instrument asset management into the DCS platform and eliminates the need for a separate asset management server with its own HART infrastructure.
• Scalable I/O Density: A single CIOM-A base accommodates 8 CHARM modules; a CIOM-B base accommodates 12. Multiple bases can be stacked within a CHARM I/O cabinet, achieving I/O densities of 96 or more analog output channels per cabinet. Because each CHARM is individually addressable, the I/O count can be expanded incrementally — adding one channel at a time — without pre-purchasing spare card slots or reconfiguring existing I/O assignments.
• Reduced Spare Parts Inventory Complexity: A single CC-TAOX11 spare covers any analog output loop in the plant, regardless of which cabinet or controller it belongs to. In contrast, traditional multi-channel I/O card sparing requires maintaining separate stock for each card type, revision, and channel count. For a plant with 500 analog output loops, the CHARM model can reduce the spare parts count from 20–30 card variants to a single CHARM part number.
• Seamless Firmware and Configuration Management: Module configuration — including engineering units, output range, HART polling address, and fail-safe value — is stored in the C300 controller database and downloaded to the CHARM automatically upon insertion. There is no manual configuration required at the module level. When a replacement CHARM is inserted, it inherits the full configuration of its predecessor within one controller scan cycle, eliminating the risk of misconfiguration during emergency replacements.

Quality Assurance & Global Logistics

Every CC-TAOX11 51308353-175 unit supplied by siemensplc.com is sourced as genuine Honeywell original equipment. Each module undergoes a structured pre-shipment inspection protocol before leaving our Xiamen, China facility:

• Authenticity Verification: Part number, revision code, and date code are cross-referenced against Honeywell’s published product matrix. Modules with inconsistent labeling, non-standard PCB markings, or suspect connector plating are rejected at intake.
• Electrical Continuity Check: Terminal-to-terminal continuity is verified on all field-side connections. Open circuits or anomalous resistance readings trigger a full functional test before the unit is accepted into stock.
• ESD-Safe Handling and Packaging: All modules are handled in an ESD-controlled environment. Shipment packaging consists of an anti-static bag, foam-lined inner box, and double-wall corrugated outer carton rated for international air freight handling.
• Documentation: A certificate of conformance and inspection checklist are included with each shipment. Test reports are available upon request for critical applications.
• 12-Month Warranty: All units carry a 12-month warranty from the date of shipment, covering manufacturing defects and premature failure under normal operating conditions.

Logistics from Xiamen are executed via DHL Express, FedEx International Priority, and UPS Worldwide Express. Standard transit times are 3–5 business days to Europe and North America, 2–4 business days to Southeast Asia and the Middle East, and 5–7 business days to South America and Africa. Export documentation — including commercial invoice, packing list, and certificate of origin — is prepared in compliance with destination country import requirements. HS Code 8537.10 applies to this product category for customs classification purposes.

Contact Information

Email: [email protected]
WhatsApp: +86 18359268345
Web: siemensplc.com
Location: Xiamen, China
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