51308301‑175, officially named CC‑TCF901, is a 9-port control firewall IOTA developed for Honeywell Experion PKS and C300 controller systems. It serves as an industrial network security and expansion unit integrated with fault-tolerant Ethernet functions. This module isolates core control networks from untrusted networks and expands Ethernet ports for field controllers and I/O devices. The conformal coating applied to this version delivers extra protection against dust, moisture and mild corrosive substances, ensuring stable operation in general industrial sites.

51308301‑175 is the Honeywell part number, adopted for purchasing, inventory management and equipment maintenance tracking. CC‑TCF901 is the formal product model. CC stands for control component series, TCF refers to termination control firewall, and 901 represents the 9-port hardware configuration. The suffix 175 indicates the model with conformal coating, which is tailored for standard industrial operating environments.

The module is equipped with nine RJ45 Ethernet ports, including one uplink port and eight downlink ports compliant with fault-tolerant Ethernet standards. It operates on 24 VDC power supply with a tolerance range of plus or minus ten percent. The operating temperature ranges from minus 20 degrees Celsius to plus 60 degrees Celsius, and the relative humidity is between 5 percent and 95 percent without condensation. It has passed CE, UL, CSA and relevant industrial certifications. The overall dimension is 145 millimeters by 121 millimeters by 53 millimeters, and the net weight is approximately 0.18 kilograms. It is installed on standard 35-millimeter DIN rails. The single module works in non-redundant mode, and redundant system can be built by deploying multiple modules.

The front panel is arranged with nine RJ45 interfaces. The uplink port connects to supervisory network or enterprise network to realize upper-level data transmission and remote diagnosis. The eight downlink ports are used to connect C300 controllers, field interface modules and other devices that support fault-tolerant Ethernet. The module supports fault-tolerant Ethernet communication to achieve automatic failover and high network availability. It operates as a network bridge with built-in firewall logic to filter illegal data packets between different network areas. It can be accessed by the Experion PKS system, so users can complete remote configuration, parameter setting and device diagnosis via the engineer station.

It realizes network isolation to protect critical control networks from unauthorized access and various network threats. It expands Ethernet access ports to reduce the use of external switches and simplify internal wiring of control cabinets. The built-in firewall filters abnormal network traffic and guarantees the real-time performance and integrity of control data. The device supports hot swapping, allowing on-site replacement without interrupting the normal operation of the whole system. The conformal coating enhances environmental adaptability and prolongs service life under ordinary industrial conditions.

This product is widely applied in process industries such as oil and gas, chemical engineering, power generation, water treatment and pharmaceutical manufacturing. It is mainly matched with Honeywell Experion PKS DCS and C300 controller platforms. It is commonly used for network division in control rooms, networking of redundant controllers and access of various fault-tolerant Ethernet I/O modules. It is suitable for standard industrial control rooms with regular temperature and humidity. When used in highly corrosive or explosive areas, the module must be placed inside certified protective enclosures.

Mount the module on the standard DIN rail inside the control cabinet and keep sufficient ventilation space around it. Connect the 24 VDC power cable and confirm the power indicator works normally. Connect Ethernet cables to corresponding ports according to design requirements, run the uplink cable to the upper network and connect downlink cables to controllers or related field devices, and make sure all cables are properly grounded. Complete network parameters and firewall rule configuration on the Experion PKS engineer station. Hot swap is supported, and it is recommended to perform replacement during scheduled maintenance to avoid network fluctuation.

Keep the interior of control cabinets clean and dry, and maintain the operating temperature and humidity within the specified range. Conduct regular inspections to check whether Ethernet connectors are fastened and intact, and observe the running status of indicator lights. Remove surface dust with a dry soft cloth, and never use liquid detergent to clean the module. Store spare units in cool and dry places with temperature ranging from minus 40 degrees Celsius to plus 85 degrees Celsius, and avoid heavy pressure and severe vibration. Do not use the module in harsh environments with strong corrosion without protective measures. Do not disassemble the module arbitrarily, as it may cause equipment failure and invalidate relevant certifications.