The Allen-Bradley 1769-L33ER is a CompactLogix 5370 PAC controller with 2MB of user memory, dual-port EtherNet/IP connectivity with DLR support, and capacity for up to 16 local 1769 I/O modules and 40 EtherNet/IP nodes. Its dual RJ45 ports support linear, star, and DLR ring topologies for network redundancy without external switches. Programming is via Studio 5000 Logix Designer, with online editing capability that allows partial downloads without stopping the process. The compact form factor (approx. 138×22×105 mm) makes it ideal for small to mid-size machine control, packaging systems, pump stations, and standalone skid automation where a full ControlLogix rack would be overkill.
Frequently Asked Questions
Q: What is the difference between 1769-L33ER and 1769-L33ERM?
A: The 1769-L33ERM adds integrated motion control on EtherNet/IP. The L33ER does not support integrated motion.
Q: How many local I/O modules can the L33ER support?
A: Up to 16 local 1769 Compact I/O modules on the backplane, plus up to 40 remote EtherNet/IP nodes.
Q: Does it support Device-Level Ring (DLR)?
A: Yes, the dual-port Ethernet interface supports linear, star, and DLR ring topologies.
Q: What programming software is required?
A: Studio 5000 Logix Designer (version 21 or later).
Q: Can I make program changes while the controller is running?
A: Yes, online editing is fully supported, including partial downloads without process shutdown.
Q: Does it support controller redundancy?
A: No, the 1769-L33ER does not support controller redundancy. For redundant applications, consider ControlLogix 5570 or 5580 systems.
Q: What power supply is required?
A: A separate 1769 series power supply module (e.g., 1769-PA2, 1769-PB2) must be installed to the left of the controller.
Q: What is the user memory size?
A: 2 MB, suitable for small to medium-scale machine control applications.
