CC-PCNT01 Replacement | Honeywell Series C Control Processor

Description

Product Introduction (Anti-Template)

The CC-PCNT01 is the brain of a Honeywell C300 controller. It sits in the Series C rack, running the control strategies that keep a process unit stable. This module is the workhorse of the Experion PKS for medium-to-large-scale applications. It handles regulatory control, logic, and sequencing, and communicates with I/O across the control network.

Its value is in its deterministic execution and redundancy. The 1 MB application memory is dedicated to control logic, separate from the OS and communication overhead. When paired with a second CC-PCNT01 in a redundant pair, it provides bumpless transfer on failure—the process doesn’t see a glitch. For a refinery or chemical plant, that means no spurious trips and no flaring events.

4. Key Technical Specifications

5. Compatible Replacement Models

The C300 controller family has specific modules for different performance needs and system generations.

• ✅ Drop-in Replacement: CC-PCNT01 (same part number)
  Any CC-PCNT01 is a direct hardware replacement. It fits in the same slot, uses the same power supply, and connects to the same I/O. However, the module must be loaded with the correct CEE firmware revision for your Experion PKS version. The hardware is identical; the firmware defines compatibility.
• ⚠️ Software Compatible: CC-PCNT02
  This is the higher-performance version with 2 MB application memory and 128 MB SDRAM. It is physically identical and fits in the same rack. It can run the same control strategies but requires a different firmware load and may be recognized differently by the engineering tools. A CC-PCNT02 can replace a CC-PCNT01, but you must verify the project configuration can accommodate the extra memory.
• ❌ Hardware Incompatible: CC-PAIH01
  This is an analog input HART module, not a controller. It fits in the same Series C rack but performs a completely different function. You cannot use it as a controller. The slot in the rack must be configured for a controller (typically slots 0 and 1) and will not accept an I/O module.

6. Frequently Asked Questions (FAQ)

What is the difference between CC-PCNT01 and CC-PCNT02?
The primary difference is memory. The CC-PCNT01 has 1 MB application memory and 64 MB SDRAM. The CC-PCNT02 doubles both to 2 MB and 128 MB. The physical form factor, connectors, and power requirements are identical. The CC-PCNT02 is for larger, more complex control strategies that exceed the 1 MB limit. If your application fits in 1 MB, the CC-PCNT01 is sufficient.

Can I use a CC-PCNT01 as a standalone controller?
Yes, absolutely. The CC-PCNT01 is designed to operate as a standalone controller or as part of a redundant pair. In standalone mode, it executes control strategies and communicates with I/O and the Experion network without a partner. If you need higher availability, you add a second CC-PCNT01 in the adjacent slot for 1:1 redundancy.

How do I know if my CC-PCNT01 is in run mode?
Look at the front panel LEDs. A steady green “RUN” LED indicates the controller is executing control strategies. A steady green “ACTIVE” LED means it is the primary controller in a redundant pair (or the only controller). If the “FAIL” LED is red, the controller has detected a hardware or software fault and is not running logic.

What causes a CC-PCNT01 to fail?
We see three common failure modes. First, power supply issues—if the rack power supply fails or outputs noisy DC, the controller can lock up. Second, Ethernet communication chip failure—often from surge events on network cabling. Third, corruption of the CEE operating system or application load, which can sometimes be fixed by reloading, but often indicates a failing flash memory chip.

Can I hot-swap a CC-PCNT01 in a redundant pair?
Yes, that’s the point of redundancy. In a 1:1 redundant pair, you can remove the secondary (standby) controller while the primary continues to run the process. The system will automatically synchronize when you insert the replacement. However, never remove the primary controller while the secondary is healthy—it will cause a brief bump as the secondary takes over. Always verify which module is active before pulling.

Do I need to load firmware on a replacement CC-PCNT01?
Yes, typically. New surplus modules come with a base CEE firmware, but it may not match your system’s version. You will need to load the correct firmware revision for your Experion PKS release. This is done via the engineering tools (Control Builder) over the network. You will also need to load your application control strategies after the firmware is matched.

My CC-PCNT01 shows “FAIL” LED but powers up. What should I check?
First, check the engineering station for diagnostic messages. The “FAIL” LED can indicate a hardware fault or a software crash. Try a power cycle—remove the module, wait 30 seconds, and reinsert. If the fault clears and the controller runs, it may have been a transient. If the fault returns immediately, the module likely has a hardware issue. If the fault appears during application load, the issue may be corrupted logic or incompatible firmware.

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