Honeywell 51402797-200 DCS Module/Board/Rack

Configured for high-speed network interfacing in TotalPlant Solution (TPS) and TDC 3000 Distributed Control Systems (DCS), the Honeywell 51402797-200 (51402797-200 LCNP Card) provides direct physical/electrical execution. The board serves as the critical hardware link that transforms a standard PC into a Global User Station (GUS) by bridging the PC backplane directly to the coaxial Local Control Network (LCN).

Hardware Specifications

Distributed Control System Interface and Protocol execution

• 4-20 mA HART Loop Protocol Integration: The board coordinates downstream physical data processing by routing commands from the GUS operator environment directly into the LCN coax network, driving field-level analog input/output modules and multi-drop HART loop transmitters.
• Physical Coaxial Tap Isolation: Features transformer-coupled galvanic isolation for standard redundant LCN coaxial cables, protecting the PC hosting the GUS from common-mode electrical surges and transient electrical spikes on the industrial network bus.
• Cold Junction Compensation (CJC) Routing: Manages the localized bus bandwidth required to feed real-time cold-junction corrected thermocouple signals from field-terminated I/O cabinets directly onto the operator workstation screen with sub-millisecond network latency.

Frequently Asked Questions

Q: What is the mechanical and physical difference between the 51402797-200 and the 51402797-100 LCNP modules?

A: The 51402797-200 model features an integrated hardware card guide assembly and bracket designed for specific PC chassis structures (such as compatible Dell platforms), whereas the 51402797-100 is supplied without the card guide. Both boards share identical electrical and logic processing functions.

Q: Does this card require local external power connections?

A: No. The board derives all operating power directly from the host PC motherboard bus interface. It does not require an external power supply to execute network processing tasks.

Field Installation Guidelines

• Static Discharge Mitigation: Always wear an ESD grounding wrist strap connected to a verified ground point before removing the card from its static-shielding packaging or handling the internal components of the host PC.
• Card Guide Alignment: Ensure the integrated card guide aligns precisely with the guide tracks of the host PC slot. Firmly seat the gold-plated edge connector into the motherboard slot before securing the mounting bracket screws.
• Coaxial Cable Connection: Hand-tighten the BNC connectors for LCN cable links A and B. Do not use tools, as over-tightening can crush the physical dielectric insulation of the coaxial cable, causing signal reflection and communication failure.