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Key Technical Specifications
| Parameter | Details |
|---|---|
| Manufacturer | Honeywell |
| Model | 8C-PCNT02 |
| Part Number | 51454363-275 |
| Product Family | Honeywell Series 8 C300 I/O |
| Module Type | Pulse Counter / Frequency Input Card |
| Compatible System | Honeywell Experion PKS C300 controller station |
| Mounting | C300 I/O rack with matching IOTA/terminal assembly |
| Coating | Conformal coated (8C prefix indicates coated hardware) |
| Typical Application | Flowmeter pulse totalizing, turbine/encoder counting, batch counting, event tallying |
| Notes | Exact channel count, input voltage range, frequency range, and isolation ratings must be confirmed against the Honeywell datasheet |
Product Introduction
The 8C-PCNT02 is not a C300 CPU. It is a Series 8 pulse counter I/O card that sits in the C300 rack and feeds pulse/frequency data into the controller. I have seen this card used on flow totalizers, turbine meters, encoder tracks, and batch counters where the plant needs clean pulse capture without adding a standalone counter.Engineers keep this module because it is the correct Series 8 replacement for older uncoated pulse cards. The “8C” prefix means conformal coating, which matters in humid, dusty, or corrosive cabinets. The card itself is straightforward: configure the pulse mode, set filtering, map the count into the C300 logic, and let the controller handle scaling. Do not mix it up with CC-PCNT02, which is a different C300 processor/controller module. That mistake wastes a shutdown.
Quality SOP & Tech Pitfalls
The Lab Report (SOP):
- Visual inspection: check housing, backplane connector pins, coating condition, and label legibility.
- Part-number verification: confirm 8C-PCNT02 and 51454363-275 match the order and the rack requirement.
- Rack test: seat the module in a compatible C300 I/O rack with the correct IOTA.
- Recognition check: confirm the C300 controller detects the module and reports the correct hardware type.
- Functional check: apply a known pulse source and verify counted values, filtering, and scaling behavior.
- Log firmware/hardware revision, record serial number, and seal in anti-static packaging.
The Engineer’s Warning (Pitfalls):
- Do not confuse 8C-PCNT02 with CC-PCNT02. One is a Series 8 pulse I/O card; the other is a C300 controller processor.
- The IOTA/terminal assembly matters. A wrong IOTA can give you the wrong wiring map even if the card seats physically.
- Pulse filtering is not cosmetic. Too little filtering and you count noise. Too much and you miss real pulses. I have seen a custody-transfer totalizer drift because someone copied the wrong filter setting from an old print.
- Always photograph the existing slot, IOTA wiring, channel configuration, and scaling factors before removal.
Installation & Configuration Guide
1. Pre-Installation ️
- Place the C300 station and affected I/O in a safe state per plant procedure.
- Photograph the slot position, IOTA wiring, module label, and current channel configuration.
- Confirm the replacement is 8C-PCNT02, not CC-PCNT02 or another Series 8 I/O type.
2. Removal
- Label the slot and IOTA connections.
- Do not hot-swap unless your site procedure, redundancy status, and Honeywell documentation explicitly allow it.
- Release the module without forcing the backplane connector.
3. Installation
- Verify the correct IOTA/terminal assembly before seating the card.
- Seat the 8C-PCNT02 firmly into the correct Series 8 slot.
- Restore terminal wiring exactly as photographed.
4. Power-On & Testing
- Restore rack power and check module status indicators.
- Confirm the C300 controller recognizes the module.
- Apply a low-frequency test pulse first.
- Verify count accumulation, scaling, and alarm behavior before returning the loop to service.
Compatible Replacement Models
| Compatibility Tier | Model | Notes |
|---|---|---|
| Drop-in Replacement | 8C-PCNT02 51454363-275 | Same Series 8 coated pulse counter card; verify IOTA and channel config. |
| ️ Verify Before Use | 8U-PCNT02 | Uncoated Series 8 variant; may be acceptable in clean cabinets but not a like-for-like replacement in coated systems. |
| Not Interchangeable | CC-PCNT02 | C300 controller processor module, not a pulse I/O card. |
| Not Interchangeable | Other Series 8 AI/AO/DI/DO cards | Different function; cannot replace a pulse counter channel set. |
Frequently Asked Questions (FAQ)
Q: Is 8C-PCNT02 a C300 CPU?
No. It is a Series 8 pulse counter I/O module for the C300 station. CC-PCNT02 is the C300 controller processor.Q: Can I use it in any C300 rack?
It must be installed in a compatible Series 8 C300 I/O rack with the correct IOTA. Do not force it into an incompatible backplane.Q: Can I hot-swap this card?
Only if your site method statement, redundancy configuration, and Honeywell documentation permit it. I would not risk it on a live custody-transfer or safety-related count without approval.Q: Why does the “8C” prefix matter?
“8C” indicates conformal-coated hardware, which is preferred for humid, dusty, or chemically aggressive environments. Replacing a coated card with an uncoated one can reduce environmental protection.Q: What should I check before buying?
Confirm the full model, part number, channel configuration, firmware compatibility, IOTA type, and whether the unit is new surplus or verified used.Q: Will it count encoder signals?
It depends on the configured pulse mode and the encoder output type. Verify the input requirements and filtering settings against the Honeywell datasheet.
