Description
Key Technical Specifications
| Parameter | Detail |
|---|---|
| Product Family | Honeywell TDC 3000 / TPS DCS system |
| Order Code | 51305072-300 CLCN-B |
| Module Type | LCN coaxial network interface module |
| Network | Local Control Network (LCN) |
| Physical Interface | Coaxial LCN connection (BNC-type typical for LCN nodes) |
| System Role | LCN communication node for TDC 3000/TPS/TPN |
| Revision | CLCN-B |
| Compatible Systems | TDC 3000, TPS, TPN architectures |
| Mounting | Honeywell DCS rack/chassis |
| Status | Verify as new, surplus, or refurbished before installation |
Product Introduction
The Honeywell 51305072-300 CLCN-B is a Local Control Network (LCN) interface module used in Honeywell’s TDC 3000 and TPS distributed control systems. The LCN is the middle-tier network in these architectures, connecting operator stations, history modules, application modules, and gateway nodes such as the Network Interface Module (NIM).
The “51305072” family covers several LCN-related cards, with suffixes such as -100, -200, -300, and -500 indicating different variants. The “CLCN” designation confirms this is an LCN coax interface card, and the “-B” suffix denotes the hardware revision. Exact channel count, LED indicators, and firmware dependencies should be verified from the physical nameplate.
This is a legacy DCS component. Honeywell’s current flagship platform is Experion PKS, and TDC 3000/TPS systems are maintained as installed base with upgrade paths available.
QA/QC Transparency SOP
- Intake & Origin Verification: Record full part number 51305072-300 CLCN-B, revision, serial number, and rack history. Confirm it is a genuine Honeywell LCN module and not a mislabeled generic I/O card.
- Visual Inspection: Check the front-panel label, coax connector(s), edge connector pins, and any signs of corrosion or overheating. Verify the CLCN-B revision marking.
- Electrical Tests: Measure insulation resistance and verify no shorts on the backplane connector. Check coax connector continuity and shielding integrity.
- Live System Test: Install into a compatible TDC 3000/TPS LCN rack. Verify LCN node recognition, communication status LEDs, and absence of LCN fault alarms. Confirm the node address does not conflict with existing LCN devices.
- Final QC & Packaging: Label part number, revision, test results, and system compatibility. Pack in anti-static materials with a test summary.
Field Engineer Gotchas
- Mislabeled as PLC I/O: Many surplus listings call this a generic input/output or processor module. It is an LCN network interface card for Honeywell TDC 3000/TPS, not a standalone PLC.
- LCN address conflicts: Each LCN node requires a unique address. Installing a surplus card with an inherited node address can cause communication conflicts on the LCN.
- Coax termination: LCN segments require proper coax termination. Missing or incorrect terminators cause reflections and intermittent communication faults.
- Revision compatibility: The “-B” revision may have different firmware or hardware requirements compared to “-A” or other variants. Verify compatibility with your existing LCN nodes.
- Legacy system risk: TDC 3000/TPS is a legacy platform. Replacement parts are increasingly sourced from surplus channels, and OEM support may be limited.
Honeywell 51305072-300 CLCN-B
Application Scenarios
- TDC 3000/TPS LCN expansion: Adding or replacing an LCN communication node in an existing Honeywell DCS installation.
- Legacy system maintenance: Replacing a failed LCN card in a refinery, petrochemical, or power plant still running TDC 3000/TPS.
- LCN troubleshooting: Swapping a suspect LCN card to isolate whether a communication fault is hardware-related or network-related.
- Decommissioning support: Useful for maintaining legacy systems during phased migration to Experion PKS.
FAQ
- What system does 51305072-300 CLCN-B belong to?
It belongs to the Honeywell TDC 3000/TPS DCS family and serves as an LCN coaxial network interface module. - Is this a PLC or I/O module?
No. Despite some surplus listings describing it as a generic I/O or processor module, it is an LCN communication card for Honeywell’s legacy DCS. - What does “CLCN” mean?
CLCN indicates an LCN coax interface card within the 51305072 family. - What does the “-B” suffix mean?
It denotes the hardware revision. Verify compatibility with your existing LCN nodes before installation. - Can it be used in Experion PKS?
No. This is a TDC 3000/TPS legacy component. Experion PKS uses different hardware platforms. - Is this unit new or surplus?
Treat it as surplus/refurbished unless OEM documentation proves otherwise. Verify revision, node address, and physical condition before commissioning. - What should I check before installing?
Verify the LCN node address, coax termination, revision compatibility, backplane connector condition, and that the card is correctly seated in a compatible TDC 3000/TPS rack.
