1769-L32C Allen-Bradley CompactLogix ControlNet PLC Controller

Product Description
The Allen-Bradley 1769-L32C is a compact, high-performance programmable logic controller (PLC) from the CompactLogix 5370 series, featuring an integrated ControlNet communication port for deterministic, high-speed industrial networking. Designed for mid-range automation applications, it combines embedded I/O processing, real-time control, and seamless integration into Rockwell Automation architectures.

This controller supports up to 30 local 1769 I/O modules across three banks (with appropriate power supplies and expansion cables) and can manage distributed I/O via ControlNet or EtherNet/IP when used with compatible adapters. Its onboard non-volatile memory retains programs and data without battery backup, enhancing reliability in power-loss scenarios.

Key technical specifications:

• Processor: CompactLogix 5370 series, 32-bit architecture

• User Memory: 1 MB (for logic, tags, and data)

• Digital I/O Capacity: Up to 256 local points; expandable to thousands via remote I/O

• Analog I/O Support: Yes, via 1769 analog modules

• Integrated Communication Ports:

• 1 × RS-232/485 serial port (DF1, Modbus RTU)

• 1 × ControlNet port (coaxial BNC connector, compliant with CIP Sync and CIP Motion)

• ControlNet Features:

• Supports I/O, messaging, and time-critical motion control

• Network update interval as low as 2 ms

• Redundant media support (via external repeaters)

• Programmable with: Studio 5000 Logix Designer (v20+)

• Power Requirements: Powered via 1769 backplane (requires 1769-PA or -PB power supply)

• Slot Width: Occupies 3 module slots in a 1769 chassis

• Operating Temperature: 0°C to +60°C

• Isolation: 500 V AC between field wiring and system circuits

• Real-Time Clock: Built-in, battery-free (retained via supercapacitor)

Note: The 1769-L32C does not include an embedded EtherNet/IP port—unlike the L33ER or L35E models. For Ethernet connectivity, a 1769-ENBT or similar communication module must be added.

Typical Applications

• Machine control with synchronized motion over ControlNet

• Legacy system upgrades requiring deterministic network performance

• Packaging, material handling, and assembly lines with distributed I/O

• Integration with Allen-Bradley drives (e.g., PowerFlex) and remote I/O racks

FAQ
Q: Can the 1769-L32C communicate over EtherNet/IP?
A: Not natively. It requires an additional 1769-series communication module such as the 1769-ENBT (EtherNet/IP) or 1769-SM2 (serial/EtherNet combo).

Q: Is this controller suitable for motion control?
A: Yes. With ControlNet and Studio 5000, it supports coordinated motion using CIP Motion—ideal for applications with Kinetix 300/350 drives.

Q: How many I/O banks can it support?
A: Up to three banks (Bank 0 + Bank 1 + Bank 2), connected via 1769-CRL expansion cables, with each bank requiring its own 1769 power supply.