Allen-Bradley 1756-CP3 RS232 Cable Logix SLC Programming

Product Architecture & OverviewThe Allen-Bradley 1756-CP3 is a dedicated serial communication interface for the Logix and SLC controller families. This 3-meter (10-foot) programmer cable facilitates a point-to-point RS232 connection between a controller’s front-panel serial port and Data Terminal Equipment (DTE). Featuring a 90-degree female 9-pin D-shell connector for the controller side and a straight female 9-pin D-shell for the PC side, the 1756-CP3 ensures stable serial data transfer for logic configuration and online monitoring.Oiltech Controls’s InsightThe 1756-CP3 remains the industry standard for physical serial access to ControlLogix chassis.Engineered with superior shielding to prevent EMI interference during critical logic synchronization.Right-angle connector design is essential for closing cabinet doors during active monitoring.Directly supports high-speed serial baud rates required for RSLinx Classic configuration.Inquiries: [email protected] | WhatsApp: 86 158 8020 0923Core Technical MatrixManufacturer: Rockwell Automation / Allen-BradleyPart Number: 1756-CP3Cable Interface: RS232 Serial (DB9 Female to DB9 Female)Cable Length: 3 Meters (10 Feet)Series Support: ControlLogix (Logix 5550 ), SLC 5/03, 5/04, 5/05Connector Profile: 90-degree (Controller) / Straight (PC)Thermal Dissipation: 17.4 BTU per hourNet Weight: 0.293 kg (0.64 lbs)Device Suitability & InterfacingFully compatible with ControlLogix 1756-L55, L6x, and L7x series processors.Supports serial communication for SLC 500 modular controllers (SLC 5/03 and above).Interfaces with standard DB9 COM ports on industrial PCs or high-quality USB-to-RS232 converters.Optimized for use with Studio 5000 and RSLogix 500/5000 programming environments.Logistics & Warranty TermsWarranty: 12-Month standard industrial warranty coverage.Dispatch Speed: Rapid shipping within 24-48 hours from order confirmation.Carrier Partners: Global express delivery through FedEx, UPS, and DHL.Quality Status: New & Original in factory-sealed packaging.Purchasing & Selection GuideVerify the controller side requires a 9-pin D-shell; some CompactLogix units may require different mini-DIN cables.Select the 1756-CP3 for fixed 3-meter distances; ensure RS232 signal integrity for longer runs.If your laptop lacks a COM port, use a high-quality industrial USB-to-Serial adapter.Contact [email protected] or 86 158 8020 0923 for bulk project pricing.Professional FAQ (Field Experience)Why does the 1756-CP3 use a right-angle connector?It reduces physical strain on the controller’s serial port and allows for enclosure door clearance.Can this cable be used for DH-485 communication?No, the 1756-CP3 is strictly an RS232 null-modem style cable and does not support DH-485.What is the maximum baud rate supported by the 1756-CP3?It supports the full baud rate capability of the Logix serial port, typically up to 115.2 Kbps.Is it safe to leave the 1756-CP3 connected permanently?While possible, it is recommended for programming and diagnostic use only to prevent mechanical wear.How do I troubleshoot a “Failed to Browse” error in RSLinx?Ensure the “RS-232 DF1 Devices” driver is configured and use the “Auto-Configure” feature.Copyright © 2026 Oiltech Controls Limited. All rights reserved.All rights reserved.