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.
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