Honeywell DPCB21010002 Rack Slot Printed Circuit Board (Rev A)

The Honeywell DPCB21010002 is a backplane PCB designed for use in Honeywell distributed control system (DCS) racks, specifically revision A. This board provides the physical and electrical interconnection between the rack's power supply, controller, and I/O modules. It is a critical component for system integrity and signal routing.

Board Specifications

• Part number: DPCB21010002

• Revision: A (Rev A)

• Number of slots: Typically 8 or 10 (depending on rack type)

• Bus type: Parallel I/O bus with address/data lines

• Supply voltage: 5V DC, 24V DC (from external supply)

• Maximum current per slot: 2A (5V) / 1A (24V)

• Number of layers: 4-layer FR4 with power/ground planes

Connector Details

The board features DIN 41612 style connectors (Type C and Type F) for module insertion. Power input is via a terminal block (Phoenix Contact type) or a dedicated backplane connector. The board includes keying features to prevent incorrect module insertion.

Signal Integrity and Termination

The DPCB21010002 is designed for high-speed signal integrity with controlled impedance traces and termination resistors at the bus ends. It includes bypass capacitors near each slot to reduce noise. The board also provides a dedicated ground plane for reduced EMI.

Environmental and Reliability

Operating temperature: 0-60°C; storage: -40-85°C. The PCB is conformal coated (acrylic) to resist moisture and dust. It has a MTBF of >200,000 hours. The board meets IPC-A-600 Class 2 standards.

Compatibility

This board is compatible with Honeywell TDC 3000, TPS, and possibly Experion PKS racks (consult Honeywell documentation). It accepts standard Honeywell I/O modules such as analog input (AI), analog output (AO), digital input (DI), and digital output (DO) cards of the respective series.

Dimensions and Mounting

Dimensions: 300mm x 200mm x 1.6mm (standard Eurocard format). Mounting: four M3 screws at corners. The board mounts inside a Honeywell chassis with standoffs. Weight: approximately 250g.

Installation Notes

When replacing a backplane, ensure the rack is de-energized and all modules removed. Observe ESD precautions. Torque mounting screws to 0.6 Nm. After installation, verify continuity of power and ground connections.

Status LEDs and Indicators

No onboard LEDs; status is provided by the rack’s power supply module. The backplane includes test points for debugging: TP1 (5V), TP2 (24V), and TP3 (GND).

Ordering and Spares

Order number: DPCB21010002. This is a spare part for legacy Honeywell systems. Honeywell recommends replacing the entire backplane if any slot connector is damaged.

Conclusion

The Honeywell DPCB21010002 Rev A is a reliable, well-engineered backplane PCB for Honeywell DCS racks, ensuring proper module communication and power distribution in critical process control environments.