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Allen-Bradley 1769-L31 CompactLogix Controller

Configured for serial control execution in CompactLogix PAC systems, the Allen-Bradley 1769-L31 (1769-L31 Controller) provides direct physical and electrical execution through dual RS232 communication channels, 512 KB user memory, and modular I/O expansion capability.

Hardware Specifications

Parameter	Specification
Model	1769-L31
Brand	Allen-Bradley
Origin	USA
Product Type	Controller
Product Line	CompactLogix
Module Type	Control Module
Weight	0.69 lbs (0.31 kg)
Operating Temp	0 to 60 deg C
Power Consumption	Not specified in provided data
Memory	512 KB
Communication Ports	Two RS232 ports
Channel Isolation	Channel 0: Fully isolated; Channel 1: Non-isolated
Communication Protocols	DH485, DF1, ASCII
Maximum I/O Modules Supported	16 modules
Maximum I/O Banks Supported	3 banks
Power Supply Distance Rating	8 modules
Battery	1769-BA
Series	A and B
Enclosure Type Rating	Open Style
Wire Type	Copper, 90 deg C
Wire Size (Solid)	22-14 AWG
Programming Cable	1747-CP3 / 1756-CP3
Vibration Rating	Operating: 10 to 500 Hz, 5G, 0.030 in. peak-to-peak
UPC	10612598313652

Industrial Control Network Integration

The 1769-L31 controller operates within the Allen-Bradley CompactLogix platform and manages local I/O execution through the 1769 backplane architecture. Therefore, the controller supports modular I/O density scaling with up to 16 connected I/O modules distributed across three I/O banks.

The controller provides two RS232 serial communication ports. Channel 0 supports full electrical isolation, while Channel 1 provides a non-isolated serial interface. In addition, the module supports DH485, DF1, and ASCII communication protocols for serial device integration.

The CompactLogix architecture uses firmware-controlled processor functions to coordinate application execution, I/O scanning, and serial communication tasks. Furthermore, the controller supports integration with compatible programming environments through specified programming cables.

Frequently Asked Questions

Q: How many I/O modules can the 1769-L31 controller support?
A: The 1769-L31 supports up to 16 CompactLogix I/O modules and allows expansion across up to 3 I/O banks.

Q: Are both RS232 communication channels electrically isolated?
A: No. Channel 0 provides full isolation, while Channel 1 uses a non-isolated RS232 interface.

Q: Which battery module does the 1769-L31 require?
A: The controller uses the Allen-Bradley 1769-BA battery module for memory retention functions.

Field Installation Guidelines

Install the 1769-L31 controller within an open-style industrial enclosure that provides mechanical protection and environmental control.

Use copper conductors rated for 90 deg C operation and follow the specified 22-14 AWG solid wire range for field connections. Maintain proper separation between serial communication wiring and high-voltage power conductors to reduce electrical interference.

Connect the programming cable through the designated serial interface and verify the selected communication protocol before commissioning. When installing RS232 devices, confirm the isolation requirements of each connected channel to prevent unwanted ground loops.

Verify the installed battery condition before system startup and follow the CompactLogix platform procedures for controller configuration, firmware compatibility, and application loading.

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