1769-L31 AB PLC CPU 512 KB Dual RS232 16 IO Expansion

Parameters

• Product type: Modular PLC controller
• User memory: 512 KB
• Serial ports: 2 RS-232 ports
• Channel 0: Isolated; supports DF1, DH-485 and ASCII
• Channel 1: Nonisolated; supports DF1 and DH-485
• Built-in Ethernet: None
• Local I/O capacity: Up to 16 compatible 1769 modules
• I/O banks: Up to 3
• Power supply distance: Maximum 4 modules
• Power arrangement: Compatible separate 1769 system supply
• Backup storage: Optional 1784-CF128 CompactFlash card
• Battery: 1769-BA; inclusion and condition to be confirmed
• Programming: Compatible RSLogix 5000 version

The AB 1769-L31 is a modular PLC controller with 512 KB of user memory and two RS-232 ports. Channel 0 is isolated and supports ASCII as well as supported system protocols, while Channel 1 has a different isolation and protocol arrangement. The controller has no built-in Ethernet port. It can serve a compatible installation with up to sixteen local 1769 I/O modules, subject to bank layout, module compatibility and power-budget checks. For replacement enquiries, identify which serial channel each device uses and provide the original project version. Confirm the battery, optional CompactFlash card, power supply and end-cap requirements separately.

Supply and Quotation

Request a quotation for AB 1769-L31 with quantity, destination and preferred condition. Send label photos and required series or firmware details. We will confirm availability, included items, inspection scope, delivery terms and warranty for the specific offer. Software licenses, machine programs and optional hardware require separate confirmation.

Compatibility

Match the L31 reference, firmware, project target and serial-channel assignments. Verify the 1769 I/O arrangement and four-module power-supply distance. Ethernet versions change the port configuration and require a communication review.

FAQ

Q1. Is 1769-L31 memory 512 KB or 750 KB?

The controller specification manual lists 512 KB for L31. The 750 KB value belongs to other references, including L32E.

Q2. Are the two RS-232 channels identical?

No. Channel 0 is isolated and supports ASCII. Channel 1 is nonisolated and has a different supported protocol set. Match the existing device connection.

Q3. Does 1769-L31 support a direct Ethernet connection?

It has no embedded Ethernet port. Its built-in communication is through two RS-232 channels; any network adaptation requires a separate review.

Q4. How can I obtain a quote for 1769-L31?

Send the complete model, quantity, destination and preferred condition. Include label photos, hardware series and firmware requirements. Price and availability are confirmed for the offered unit.

Q5. Does the controller arrive with my machine program?

Hardware supply does not automatically include machine files, passwords or engineering software. Confirm access to the original project and the compatible software before replacement.

Q6. What inspection details and accessories can be confirmed?

Request label and connector photos, revision identification and an agreed power-up or communication check where applicable. Confirm every included accessory, packing, dispatch timing and warranty in the offer.