Allen-Bradley 1786-RPCD ControlNet Dual Copper Repeater Module

Allen-Bradley 1786-RPCD ControlNet Dual Copper Repeater Module

Configured for signal repeating and topology expansion in ControlNet networks, the Allen-Bradley 1786-RPCD (1786-RPCD ControlNet Dual Copper Repeater Module) provides direct physical/electrical execution. It operates as a modular hardware component that extends the physical distance and node count of ControlNet segment topologies when mounted alongside a 1786-RPA repeater adapter host.

Hardware Specifications

Deterministic Industrial Network Architecture

The module interacts directly with the high-speed backplane provided by the 1786-RPA adapter to maintain deterministic ControlNet network performance across split copper physical segments. By regenerating incoming attenuation-degraded waveforms, the module eliminates packet jitter and signal loss caused by long cable runs or multi-node reflection tap points. High backplane bus communication velocity allows up to four 1786-RPCD modules to operate under a single 1786-RPA base without introducing protocol translation latencies or altering scheduled Network Update Times (NUT).

Frequently Asked Questions

Q: What is the maximum backplane power footprint when installing multiple modules on a single 1786-RPA base?

A: Each 1786-RPCD module draws 400 mA at 5 VDC from the backplane supplied by the 1786-RPA base. A maximum configuration of four repeater modules will draw up to 1.6 A at 5 VDC, requiring the primary power supply feeding the 1786-RPA base to meet total current limits.

Q: Does the 1786-RPCD module support hot-swapping during active network transmission?

A: Removal or insertion under backplane power (RIUP) must be executed strictly following industrial field safety protocols. Removing a repeater module during operation immediately disconnects all coaxial segments attached to Channel 1 and Channel 2, resulting in downstream node communication loss on affected topologies.

Field Installation Guidelines

1. Mount the host 1786-RPA repeater adapter securely onto an grounded EN 50022 35 mm x 7.5 mm DIN rail prior to installing secondary modules.
2. Align the side bus connector pins of the 1786-RPCD with the expansion port of the 1786-RPA or an adjacent 1786-RPCD module. Firmly push until the locking tabs snap into place.
3. Ensure all RG6 coaxial cables use standard BNC connectors with proper 75 Ohm terminating resistors installed at the physical ends of each trunk line segment.
4. Maintain a minimum 75 mm clearance around the module chassis to prevent heat accumulation beyond the maximum rated operating temperature of 60 deg C.
5. Bond the DIN rail directly to central protective earth (PE) using heavy-gauge copper grounding braid to mitigate high-frequency noise interference on the coaxial channels.