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The 1769-L20 (Part Number: 1769-L20) is an entry-level legacy programmable automation controller from the Allen-Bradley CompactLogix family. Designed for small-scale standalone applications, this processor provides a reliable and cost-effective solution for machine-level control. It features a compact, modular...
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The 1769-L20 (Part Number: 1769-L20) is an entry-level legacy programmable automation controller from the Allen-Bradley CompactLogix family. Designed for small-scale standalone applications, this processor provides a reliable and cost-effective solution for machine-level control. It features a compact, modular design that allows for easy expansion while maintaining a small physical footprint on the DIN rail.
Equipped with 64 KB of user memory and a dedicated RS-232 serial port (Channel 0), the 1769-L20 supports DH-485 or DF1 communications. It is versatile in its mounting options, supporting both DIN rail and panel mounting, and uses the 1747-BA lithium battery to maintain the user program and data during power loss. The controller can support up to 8 local expansion modules across two I/O banks, offering scalability for basic industrial automation needs.
| Specification | Details |
|---|---|
| User Memory | 64 KB (Combined for program and overhead) |
| Local I/O Capacity | Supports up to 8 1769 Compact I/O modules |
| Expansion Banks | Maximum of 2 I/O banks (requires 1 expansion cable) |
| Communication Port | 1 x RS-232 (9-pin D-shell) |
| Serial Protocols | DH-485, DF1, ASCII |
| Programming Cables | 1747-CP3 or 1756-CP3 |
| Backplane Current Draw | 600 mA at 5V DC; 0 mA at 24V DC |
| Battery Type | 1747-BA (User-replaceable Lithium) |
| Isolation Voltage | 30V (continuous) |
| Operating Temperature | 0 to 60 °C |
| Dimensions | 50 mm x 87 mm x 118 mm |
| Weight | 0.34 kg |
The 1769-L20 is ideal for basic machine control tasks such as simple conveyor systems, pump control stations, and small packaging machines. Because it relies on serial communication, it is frequently found in legacy installations where integration with older HMIs or DF1-compatible devices is required.
Does the 1769-L20 support Ethernet communication?
No, the 1769-L20 does not have an integrated Ethernet port. For Ethernet connectivity, you would need to add a 1761-NET-ENI module or upgrade to a newer CompactLogix 5370 series controller (e.g., 1769-L16ER).
How do I clear the "BATT" LED fault?
If the red "BATT" LED is illuminated, it indicates that the 1747-BA battery is low or disconnected. You should replace the battery while the controller is powered on to prevent the loss of the user program stored in RAM.
