Allen-Bradley 1770-SC Data Highway Station Connector

Description

Allen-Bradley 1770-SC Data Highway Station Connector

Product Dimensions：

The Allen-Bradley 1770-SC is a legacy, high-reliability component belonging to the classic PLC-2 and Universal I/O hardware family. Specifically, the 1770-SC is an I/O Station Connector (or Sub-base Connector) used to interface remote I/O chassis with communication networks.

Product Detailed Description

The 1770-SC functions as a mechanical and electrical interface unit. It is designed to accept communication modules (such as the 1771-ASB Remote I/O Adapter) and distribute power and signals across the backplane of an Allen-Bradley Bulletin 1771 Universal I/O chassis or legacy PLC-2 systems. It ensures stable, low-impedance physical connections for high-speed serial communication networks like Data Highway (DH) or Blue Hose Remote I/O (RIO).

Technical Parameters

Product Advantages

• Proven Longevity: Built to heavy-duty industrial specifications, these connectors are known to operate continuously for decades without degradation.
• Secure Physical Lock: Equipped with rugged thumbscrews or latch mechanisms to prevent accidental disconnection due to heavy machine vibrations.
• Simplified Troubleshooting: Serves as a clear demarcation point between the local rack backplane and the plant-wide communication trunk line.
• High Noise Immunity: Features excellent shielding characteristics to prevent electromagnetic interference (EMI) from disrupting critical PLC data packets.

Important Considerations & Precautions

• Legacy Status: The 1770-SC is a legacy/discontinued product. Finding direct factory-new replacements from Rockwell Automation may be difficult; most units available are refurbished or surplus stock.
• Pin Alignment: When inserting communication adapters or cables into the 1770-SC, ensure the pins are completely straight. Forcing a misaligned module can permanently bend or break the pins, ruining the connector.
• Power Down Before Service: Never insert or remove modules from the station connector while the chassis power supply is turned on. Hot-swapping on this generation of hardware can cause permanent component damage or CPU faults.
• Network Termination: If this station sits at the physical end of a Blue Hose Remote I/O line, ensure the correct terminating resistor (typically 150\,\Omega or 82\,\Omega) is installed across the communication terminals.

Product Applications

Because of its vintage, the 1770-SC is primarily found in maintenance, repair, and retrofitting operations:

• Legacy Factory Automation: Maintaining operational continuity in plants that still run Allen-Bradley PLC-2 or classic PLC-5/1771 remote I/O architectures.
• Automotive & Automotive Parts: Found in older stamping presses, welding lines, and assembly networks.
• Material Handling: Used in older, large-scale conveyor networks and sorting systems that have not yet migrated to EtherNet/IP.
• Process Industries: Serving backplane routing functions in older water treatment plants or paper mills.

Shipping Port: Xiamen, China

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