1756-L55M12 AB PLC CPU 750 KB Memory RS232

Parameters

• Product type: Modular PLC processor with memory board
• Data and logic memory: 750 KB
• I/O memory: 208 KB
• Memory configuration: 1756-L55 processor with 1756-M12 memory board
• Built-in communication: RS-232
• Ethernet connection: Via a compatible chassis communication module
• Mounting: 1756 chassis
• Power arrangement: Powered through the chassis backplane
• Nonvolatile user memory: Not provided by the M12 memory configuration
• Battery: 1756-BA1; condition and inclusion to be confirmed
• Programming: Compatible RSLogix 5000 version

The AB 1756-L55M12 combines a modular processor with the M12 memory configuration, providing 750 KB for data and logic plus a separate I/O memory area. The complete catalog number matters because other memory-board variants have different capacities or retention features. Its built-in RS-232 connection supports compatible serial access, while industrial network links use separate chassis modules. When sourcing a replacement, verify the processor and memory-board identities together. Request the hardware series, firmware information and battery condition, and retain the original application backup.

Supply and Quotation

Request a quotation for AB 1756-L55M12 with quantity, destination and preferred condition. Send the installed unit label and required firmware information. We will confirm availability, included parts, inspection scope, delivery terms and warranty for the specific offer. Programming software, machine projects and optional system components require separate confirmation.

Compatibility

Confirm both the 1756-L55 processor and 1756-M12 memory board. Check firmware, original project, battery and chassis communication modules before ordering.

FAQ

Q1. Does a bare 1756-L55 equal 1756-L55M12?

No. The complete reference specifies the M12 memory configuration. Verify the installed memory board as well as the processor label.

Q2. What memory capacity is supplied by the M12 configuration?

It provides 750 KB for data and logic and 208 KB for I/O. It should not be listed as the capacity of a different memory-board variant.

Q3. Does M12 provide nonvolatile user memory?

No. This configuration relies on the appropriate retention arrangement and application backup. Confirm the 1756-BA1 battery and preserve a verified project copy.

Q4. How can I request a quotation for 1756-L55M12?

Send the complete model, quantity, preferred condition and destination. Include the hardware series and firmware if matching an installed unit. Price and availability are confirmed in the offer.

Q5. Does the supply include the machine program or software license?

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

Q6. What inspection information can be requested?

Request clear label and connector photos, firmware identification and an agreed power-up or communication check where applicable. Confirm accessories, packaging, dispatch timing and warranty before shipment.