Description
Honeywell 8C-PAON01 | Experion C300 16-Channel AO Card
Architect’s Product Breakdown
The Honeywell 8C-PAON01 is a high-density, 16-channel analog output module designed for continuous process control within Honeywell’s Series 8 I/O family. Operating on the Experion PKS platform alongside the C300 controller, it converts loop commands calculated by the controller into precise 4–20 mA current outputs. These signals drive final control elements such as variable speed drives (VFDs), current-to-pressure (I/P) positioners, and modulating control valves.
The “8C” designation indicates factory conformal coating, shielding the internal circuit board against harsh industrial atmospheric pollutants, moisture, and corrosive gases (compliant with ISA S71.04 Class G3 standards). The module mounts directly onto a designated Series 8 Input Output Termination Assembly (IOTA) block, drawing logic power directly from the 24 VDC system bus.
Each output channel supports independent FAILOPT (Fail-Safe Options) parameters. In the event of a lost communication link with the C300 controller, channels can be configured to hold their last valid command value or shed immediately to a predefined safe state. Built-in diagnostic capabilities also allow the module to perform continuous open-wire detection, reporting field loop breaks back to the DCS host before process deviations occur.
8C-PAON01
4. Key Technical Specifications
| Parameter | Specification |
| Number of Channels | 16 Analog Output Channels |
| Output Range | 4–20 mA DC (Current Sourcing) |
| D/A Conversion Resolution | 16-Bit |
| Accuracy | ±0.1% of full scale at 25°C |
| Load Resistance Range | 50 Ω to 800 Ω |
| Fail-Safe Behavior | Per-channel configurable (Hold Last Value or Safe Value) |
| Diagnostics | Open-wire detection, channel soft failure, internal self-test |
| Operating Voltage | 24 VDC nominal (Supplied via IOTA bus) |
| Conformal Coating | Yes (ISA S71.04 Class G3 Compliant) |
| Operating Temperature | -40°C to +70°C |
Field Engineer’s Pitfall Guide
WARNING: Open-Wire False Alarms on Unused Channels
Because the 8C-PAON01 includes continuous open-wire detection, any unconfigured or unassigned analog output channels left open-circuit will trigger system diagnostic alerts in Experion. In Control Builder, soft-disable unused channels or bridge open terminals with a dummy load resistor (~250 Ω) during commissioning.
WARNING: Exceeding Max Loop Resistance (800 Ω)
The module’s internal voltage drive limits output capability to a maximum load impedance of 800 Ω at 20 mA. Wiring long distance field runs to high-impedance I/P positioners or adding multiple external isolators/recorders in series can push total loop resistance past 800 Ω, causing output current saturation and incorrect valve positioning.
WARNING: Mechanical Pin Bending During Blind IOTA Mating
Inserting the 8C-PAON01 onto the Series 8 IOTA backplane without aligning the plastic guide pins can bend or recess the multi-pin connector contacts on the rear interface PCB. Align the top and bottom guide latches firmly before applying thumb pressure to seat the card.
QA & Testing SOP
- Visual & Structural Inspection:
- Verify genuine Honeywell labeling, part number 51454357-175, and unbroken conformal coating across components.
- Check rear multi-pin connector headers for bent, corroded, or displaced pin contacts.
- Confirm mechanical latching mechanisms engage smoothly onto test IOTA baselines.
- Power & Bus Communication Verification:
- Mount the card onto an active Series 8 test harness powered by 24 VDC regulated supply.
- Verify status LED indicators transition from initial boot-up state to healthy online status.
- Confirm no excessive power supply draw or short-circuit thermal conditions on the logic board.
- Multi-Channel Loop Drive & Accuracy Calibration Test:
- Connect a precision digital multimeter/calibrator across each of the 16 output channels individually.
- Command outputs from Experion Control Builder at 4.00 mA (0%), 12.00 mA (50%), and 20.00 mA (100%).
- Verify output current accuracy remains within ±0.1% full-scale tolerance across various loop load impedances (250 Ω, 500 Ω, 750 Ω).
- Fail-Safe & Open-Wire Diagnostic Testing:
- Disconnect field wiring on an active channel and verify Experion immediately flags an “Open Wire” diagnostic alarm.
- Interrupt communication to the module and verify channels hold or shed to their pre-configured FAILOPT safe values.
- ESD Protection & Storage Preparation:
- Reset hardware configuration defaults and clear force flags in test software.
- Store and ship in anti-static ESD shielding bags containing fresh desiccant inside custom-molded protective foam boxes.
Technical FAQ
What is the difference between the 8C-PAON01 and the 8U-PAON01?
The core functional electronics are identical. The features factory conformal coating on internal circuit board assemblies to resist moisture and airborne corrosive agents (ISA S71.04 Class G3). The is the uncoated version intended for standard, climate-controlled environments.
Does the 8C- support HART protocol pass-through?
No. The 8C- is a standard analog output card intended solely for conventional 4–20 mA current loops. For intelligent field devices requiring HART communication pass-through, the HART-enabled analog output module (8C-PAOH51) must be used.
Can I hot-swap the 8C- while the system is running?
Yes. The Series 8 hardware architecture supports Online Insertion and Removal (OIR). Replacing an 8C- while the rest of the chassis is powered will generate an I/O module fault event in Experion, but will not interrupt adjacent cards or fault the main C300 controller.
What happens to field valves connected to this card if the C300 controller stops communicating?
Each channel executes its assigned FAILOPT setting. You can configure individual channels to HOLD LAST VALUE (maintaining current position) or SHED TO SAFE VALUE (such as driving current to 4 mA to fail-close a control valve).
