Description
The 51196041-100 is an LCN A-B Tee Connector Set manufactured by Honeywell (Honeywell Process Solutions) for the legendary Local Control Network (LCN) that forms the communications backbone of TDC 3000 and Experion PKS distributed control systems. Despite its unassuming size, it is one of the most consequential passive components in a Honeywell DCS: a set of non-resistor BNC coaxial tee connectors that let each LCN node tap into the dual redundant Cable A and Cable B without interrupting communication between the remaining nodes.
Physically, the 51196041-100 plugs onto the BNC tee connectors of the LCN I/O board (for example the 51305072-400 / 51305072-100 CLCNA/B card), providing one male plug and two female jacks per channel so the coaxial bus passes straight through while a branch drops off to the node. It is a genuine OEM part, purpose-designed for LCN coaxial topology — and critically, it is not the connector used for the older Data Hiway, a common source of costly misorders.
Application Scenarios
Picture a refinery control room where a TDC 3000 LCN has been running reliably for eighteen years. The central coaxial segment runs the length of the cabinet row, linking Universal Stations, Application Modules, and History Modules. Now the plant needs to add a new High-Performance Process Manager (HPM) node to support a reactor upgrade — without taking the entire LCN down for even a minute.
The instrument technician identifies the nearest tap point on Cable A (marked with yellow shrink-fit bands) and Cable B (marked with green bands). He plugs one 51196041-100 tee onto the A-side BNC header and one onto the B-side header of the new 51305072-400 LCN I/O board. The through-path of each tee maintains the continuous 75 Ω bus; only the short drop to the node is interrupted — and that node is not yet active. Once both tees are seated and the coaxial segments re-terminated, the new HPM is commissioned. The rest of the LCN never loses a packet.
That is the quiet superpower of the 51196041-100: it turns a hard network cut into a local, controlled operation — the difference between a weekend shutdown and a five-minute job during a coffee break.
Parameter
| Main Parameters | Value / Description |
|---|---|
| Product Model | 51196041-100 |
| Manufacturer | Honeywell (Honeywell Process Solutions) |
| Product Category | LCN A-B Tee Connector Set (passive coaxial branch) |
| Primary Function | Taps redundant LCN Cable A and Cable B to connect a node to the coaxial bus |
| Connector Type | BNC, 1 male plug + 2 female jacks per channel (T-configuration) |
| Impedance | 75 Ω (matched to LCN coaxial cable / RG-6 class) |
| Resistor Type | Non-resistor version (the “-100” suffix denotes non-resistor) |
| Contact Resistance | < 0.001 Ω at 25 °C (77 °F) |
| Insulation Resistance | ≥ 10⁹ Ω |
| Body Material | High-grade brass alloy with durable plating (corrosion-resistant) |
| Signal Paths | Dual: A-side and B-side (one tee per side) |
| Mounting | Plugs onto BNC tee connectors of the LCN I/O board (e.g. 51305072-400) |
| Termination | Screw-thread BNC (standard NPT-style threaded coupling) |
| Dimensions | 8 cm × 14 cm × 2 cm (shipping / assembled set) |
| Weight | 0.04 kg (40 g) |
| Operating Temperature | -40 °C to +85 °C (-40 °F to +185 °F) |
| Humidity | Industrial control-room / cabinet environment, non-condensing |
| Protection | IP67 (dust-tight, protected against temporary immersion — distributor-rated) |
| Rated Voltage / Current | 24 VDC / 1 A (distributor electrical rating; signal path is passive) |
| Compatibility | Honeywell TDC 3000 LCN, Experion PKS migration architectures |
| NOT Compatible With | Honeywell Data Hiway tee connectors (different part number) |
