1769-L32E — Modular Controller, 750 KB Memory, EtherNet/IP, 16 I/O Module Capacity

The 1769-L32E is a modular controller with 750 KB of user memory, a single embedded EtherNet/IP port, and an RS-232 serial port supporting DF1, DH-485, or ASCII protocols. It supports up to 16 I/O modules across as many as three I/O banks, using up to two expansion cables to extend the local bus, and accepts an optional CompactFlash card for non-volatile program storage.

Specifications

Parameter	Value
Part Number	1769-L32E
User Memory	750 KB
Communication	1 × EtherNet/IP, 1 × RS-232 (DF1, DH-485, ASCII)
Max I/O Modules	16
Max I/O Banks	3
Power Supply Distance Rating	4 modules
Backplane Current	660 mA @ 5V, 90 mA @ 24V
Power Dissipation	~4.7 W
Isolation Voltage	30V continuous, basic insulation
Optional Flash Memory	1784-CF128 CompactFlash
Battery	1769-BA

An Early Step Into Ethernet-Based Control

This controller occupies a specific historical and functional niche: it was among the earlier modular controllers in its broader product family to add a built-in EtherNet/IP port, providing a migration path for facilities moving from older serial-based controller architectures toward Ethernet-native networking without jumping straight to a larger, more expensive platform. The single Ethernet port handles programming, I/O messaging, and general network communication — sufficient for installations with one controller and a handful of network-connected devices, though without the dual-port ring topology support found on later controller generations.

The 16-module, 3-bank expansion capacity using up to two expansion cables gives this controller meaningful I/O reach for a mid-sized machine or process cell, distributing modules across physically separate locations within the rated cable distance rather than requiring everything to sit immediately adjacent to the controller.

FAQ

Q: Does this controller support dual-port Ethernet for ring topology?

No. It has a single Ethernet port, supporting star or linear topology only — ring participation with automatic fault rerouting requires a controller generation with dual Ethernet ports.

Q: Can the RS-232 port and EtherNet/IP port be used simultaneously for different purposes?

Yes. The serial port can connect to a legacy device or HMI using DF1, DH-485, or ASCII while the Ethernet port handles programming and network I/O at the same time, since the two interfaces operate independently.

Q: How many I/O modules can be installed on each side of the power supply?

Up to eight modules can be placed on each side of the power supply within the first I/O bank, with the controller itself required to be the leftmost module in that first bank.

Q: What battery does this controller use, and can a different type be substituted?

The 1769-BA battery is the specified replacement — substituting a battery intended for a different controller family is not recommended, since battery chemistry and connector compatibility can differ between platforms.

1769-L32E New Origina 1769L32E Ser Controller Module