Allen Bradley 1756-L61 1756-L65 ControlLogix Logix5561 Processor 2MB Memory

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FAQs

Q1: Is the 1756‑L61 still in production?

No. The 1756‑L61 has been discontinued by Rockwell Automation . The recommended functional replacement is the 1756‑L71, which offers enhanced features including a USB programming port and SD card slot .

Q2: What is the user memory capacity of the 1756‑L61?

The controller has 2 MB of user memory and 478 KB of I/O memory .

Q3: Does the 1756‑L61 have built‑in Ethernet?

No. The L61 does not have an embedded Ethernet port. It requires a separate communication module such as a 1756‑ENBT or 1756‑EN2T for EtherNet/IP connectivity .

Q4: What is the difference between Series A and Series B of the 1756‑L61?

The main differences are:

• Battery type: Series A uses 1756‑BA1 or 1756‑BATM; Series B uses 1756‑BA2 .

• CompactFlash access: Series B allows front‑accessible CompactFlash card insertion/removal .

• Firmware: Series B requires revision 13.40 or later .

Q5: Can the 1756‑L61 be used as a direct replacement for the older 1756‑L55?

Yes. The L61 is a direct upgrade path from the L55. In RSLogix 5000, you can change the controller type in the project properties from 1756‑L55 to 1756‑L61 and download the converted program . However, once converted, the project cannot be loaded back to an L55 controller.