Brand:Allen Bradley PLC Item No.:Allen Bradley 1769-L31 Product Origin:USA Product Dimensions:118 × 87 × 87 mm Product Weight:0.3 kg Payment:T/T, Western Union, Credit Card Goods_stock:15 Shipping Port:Xiamen, China Lead Time:1-3 Days Condition:Brand New And Original Warranty:1 Year Certificate:COO
The Allen Bradley 1769-L31 is a CompactLogix 5370 L3 series programmable automation controller (PAC) designed for small to mid-size industrial automation applications requiring dependable processing power, modular expansion capability, and classic RSLogix/Studio 5000 compatibility. It is widely used in legacy migration projects and stable production systems where simplicity, deterministic control, and proven architecture are more important than advanced integrated features.
Although part of an earlier CompactLogix generation, the 1769-L31 remains respected for its reliability, straightforward configuration, and strong compatibility with 1769 Compact I/O modules.
Technical Specifications
Specification Item
Details
Manufacturer
Allen Bradley (Rockwell Automation)
Model Number
1769-L31
Product Family
CompactLogix 5370 L3
Controller Type
Programmable Automation Controller (PAC)
User Memory
512 KB
Communication Ports
2 × RS-232 serial ports
Supported Protocols
DF1, DH-485, ASCII
I/O Capacity
Up to 16 local 1769 I/O modules
Expansion Banks
Up to 3 banks supported
Programming Software
RSLogix 5000 / Studio 5000 (version dependent)
Nonvolatile Memory
CompactFlash support (1784-CF64 / CF128)
Backplane Current
Approx. 330 mA @ 5V DC
Power Dissipation
Approx. 2.6 W
Battery
1769-BA (memory backup)
Power Supply Distance Rating
4 modules from power supply
Operating Temperature
0°C to 60°C
Storage Temperature
-40°C to 85°C
Mounting Type
DIN rail / panel mount
Dimensions
Approx. 118 × 87 × 87 mm
Weight
Approx. 0.3 kg
Recommended Related Models
Related Model
Function
1769-L32E
Ethernet-based successor model
1769-L30ER
Enhanced Ethernet CompactLogix controller
1769-L24ER-QB1B
Integrated I/O CompactLogix controller
1769-IQ16
Digital input module
1769-OB16
Digital output module
1769-IF8
Analog input module
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Industrial Applications
The 1769-L31 is commonly used in industrial environments where stable control and legacy compatibility are important.
Typical applications include:
Machine control systems with moderate complexity
Conveyor and material handling systems
Packaging machinery and production equipment
Pump and motor control systems
HVAC and building automation systems
OEM retrofit and upgrade projects
Small-scale process control systems
Legacy RSLogix 5000-based installations
Its RS-232 communication structure makes it especially valuable in older industrial networks and migration projects.
Key Advantages
Proven and Stable Architecture
A mature CompactLogix platform known for long-term reliability in continuous industrial operation.
Flexible I/O Expansion
Supports up to 16 Compact I/O modules, enabling adaptable system scaling for small to mid-size applications.
Legacy Communication Support
RS-232 ports with DF1, DH-485, and ASCII support make it ideal for older industrial integration environments.
Compact and Efficient Design
Low power consumption and compact form factor make it suitable for dense control cabinets.
Cost-Effective Migration Option
Often used in upgrade paths from older PLC systems due to its stability and established ecosystem.
Technical FAQs
1. What is the 1769-L31 used for?
It is used as a CompactLogix PLC for controlling industrial machines and small to mid-size automation systems.
2. How much memory does it have?
It has approximately 512 KB of user memory.
3. What communication ports does it include?
It includes two RS-232 serial ports supporting DF1, DH-485, and ASCII protocols.
4. Does it support Ethernet?
No. The 1769-L31 is a serial-based controller; Ethernet functionality requires different CompactLogix models.
5. How many I/O modules can it support?
It supports up to 16 local 1769 Compact I/O modules and up to 3 expansion banks.
6. What software is used for programming?
It is programmed using RSLogix 5000 or Studio 5000 depending on firmware version.
7. Is it still commonly used today?
It is primarily found in legacy systems and industrial upgrades rather than new installations.
8. Does it support CompactFlash memory?
Yes. It supports CompactFlash cards for nonvolatile program storage.
9. What industries use it most?
Manufacturing, packaging, utilities, and retrofit automation projects.
10. Why is the 1769-L31 still relevant?
Because it offers stable control performance, reliable serial communication, and strong compatibility with existing 1769 I/O systems in legacy industrial environments.
