Allen-Bradley 1770-XYC PLC-5 Modules

Name: Allen-Bradley 1770-XYC PLC-5 Modules
Brand: Allen-Bradley

Model: 1770-XYC

Brand Allen-Bradley

Series PLC-5

Model 1770-XYC

RFQ-ready model route Obsolete and surplus sourcing Export follow-up by model list

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Product Details And Specifications

Allen-Bradley 1770 Series Technical Notes

The Evolution of 1770 Architecture

The 1770 product family was introduced alongside the original PLC-5 platform in the early 1980s. Early variants such as the 1770-SA and 1770-SB power supplies were designed for fixed-chassis configurations, providing regulated DC power to processor and I/O modules. As the PLC-5 platform matured through the 1990s, communication adapter modules (1770-KF2, 1770-KFC, 1770-KFC15) were introduced to support Data Highway Plus (DH+) and DH-485 network topologies, enabling distributed I/O and peer-to-peer messaging across plant-wide control networks.

The transition from parallel backplane architectures to ControlNet and EtherNet/IP in the early 2000s marked the beginning of the 1770 series' lifecycle decline. Rockwell Automation formally announced end-of-life for the majority of 1770-series components between 2010 and 2018. However, the installed base in brownfield facilities has sustained a robust secondary market for tested, refurbished, and new-surplus 1770 components. Compatibility between early and late 1770-series hardware is generally maintained within the same chassis family, though firmware revisions on communication modules require verification against PLC-5 processor firmware levels.

1770 Series Full Catalog & Functionalities (SKU List)

Power Supply Modules

1770-SA: 120V AC input power supply for 1771 I/O chassis, single-slot
1770-SB: 220V AC input power supply for 1771 I/O chassis, single-slot
1770-SC: 120/220V AC selectable power supply, extended current rating
1770-SD: DC input power supply module for 1771 chassis, 24V DC

Communication Adapter Modules

1770-KF2: DH+ to RS-232 communication interface module, 57.6 kbps max
1770-KFC: DH+ to RS-232C serial communication adapter, standard baud
1770-KFC15: Enhanced DH+ communication adapter, 115.2 kbps RS-232C
1770-FF: FOUNDATION Fieldbus linking device for PLC-5 integration
1770-FD: DeviceNet scanner adapter for 1771 chassis backplane
1770-FL: ControlNet adapter module for 1771 I/O chassis, coax media

Battery & Backup Modules

1770-XYC: Lithium battery module for PLC-5 processor memory backup, 3V
1770-XYB: Alkaline battery pack for PLC-5 series, extended shelf life
1770-XR: Replacement battery cartridge for 1771 chassis memory retention

Chassis & Termination Accessories

1770-TA: Termination assembly for DH+ trunk cable, 120-ohm resistor
1770-TB: DH+ network terminator plug, panel-mount format
1770-TC: Trunk cable terminator for Data Highway Plus, 150-ohm
1770-TD: Drop cable terminator for DH+ node connections

Quality Control for the 1770 Series Range

The 1770 series presents specific quality verification challenges due to the age of the product line and the complexity of its backplane communication protocols. DriveKNMS applies the following test procedures to all 1770-series units:

Power Supply Modules (1770-SA/SB/SC/SD): Load-bank testing at rated current output; ripple voltage measurement; thermal cycling over 4-hour burn-in period.
Communication Adapters (1770-KF2, KFC, KFC15): Live DH+ network integration test; RS-232 loopback verification; baud rate negotiation across all supported speeds; firmware revision logging.
Battery Modules (1770-XYC, XYB, XR): Open-circuit voltage measurement; internal resistance check; date code verification; packaging integrity inspection.
Chassis Accessories & Terminators (1770-TA/TB/TC/TD): Impedance measurement; continuity check; connector pin inspection.

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