Honeywell 05701-A-0511 System 57 Rack Assembly

The Honeywell 05701-A-0511, also cataloged as the 05701-A-0511 Rack Assembly unit, operates as a dedicated hardware component for housing multiple control modules within System 57 platforms.

Hardware Specifications

DCS Integration & Isolation Dynamics

• Channel-to-Channel Isolation Support: The passive backplane on the 05701-A-0511 isolates adjacent slot signals to ensure that channel-to-channel isolation parameters remain unbroken when multiple gas monitoring cards are housed together.
• 4-20 mA HART Loop Protocol Coexistence: Internal shielding on the motherboard bus prevents high-frequency digital communications from bleeding into analog 4-20 mA loops or HART signals routed from the rear field terminals.
• FTE Communication Routing: Integrates dedicated 8+1 FTE switch ports on the backplane assembly, providing deterministic data path execution and physical layer redundancy directly to Honeywell C300 controllers.

Frequently Asked Questions

Q: Can modules be inserted or removed from the 05701-A-0511 rack under power?

A: Yes. The backplane design supports hot-swapping of individual cards. However, field power supply lines must be kept stable to prevent voltage dips across the remaining channels.

Q: How is the backplane powered in a C-Series architecture?

A: The rack assembly features power inputs compatible with standard Honeywell C-series 24 VDC power systems, distributing current evenly across the internal bus to all slots.

Field Installation Guidelines

• Chassis Earth Bonding: Ensure direct metal-to-metal contact between the rack assembly brackets and the grounded 19-inch cabinet frame. Remove paint from mounting points to secure a low-impedance ground.
• Rear Field Wiring Clearance: Maintain a minimum of 100 mm clearance behind the rear termination blocks to allow for proper signal cable bend radiuses and prevent thermal blockages.
• Cable Route Segregation: Route high-voltage AC lines separate from low-voltage DC signals and sensor wiring using different duct pathways to limit inductive coupling.
• Card Guide Alignment: Align modules carefully with the top and bottom rails of the slot before pushing them in to prevent pin damage on the backplane connectors.