The Allen-Bradley 1785-L40L functions as a primary processing unit within the legacy PLC-5 architecture. This controller manages complex automation tasks by coordinating diverse field devices across industrial networks. It features 48,000 words of protected user memory to store logic and data tables. Furthermore, the unit supports an extensive capacity of up to 2048 total I/O points. This makes the 1785-L40L ideal for medium to large-scale manufacturing applications.
Extended Local I/O Capabilities
A standout feature involves the Extended Local I/O link capability inherent to the “L” series modules. This interface allows the CPU to connect with up to 16 chassis in a high-speed local configuration. Consequently, users can expand their system without the latency typically found in standard remote networks. The module also utilizes proven Data Highway Plus (DH+) and Universal Remote I/O (RIO) protocols. These ports facilitate seamless communication with human-machine interfaces and other plant-floor controllers.
Technical Specifications and Environmental Ratings
- Memory Capacity: 48K words (SRAM with battery backup)
- Total I/O Maximum: 2048 (any mix of inputs and outputs)
- Max Number of I/O Chassis: 16 Extended Local or 20 Remote
- Communication Channels: DH+, Universal Remote I/O, and RS-232-C
- Backplane Current Load: 3.3 Amperes at 5V DC
- Module Weight: 1.38 kg
- Product Dimensions: 4.8 x 16.7 x 27.4 cm
- Safety Certifications: UL, CSA, CE, and C-TICK
Reliable Performance in Rigorous Environments
The 1785-L40L ensures maximum uptime through its robust hardware design and electrical isolation. It provides heavy-duty protection against electromagnetic interference and voltage surges common in factory settings. Moreover, the front panel includes clear diagnostic LEDs for rapid status verification. This allows maintenance teams to identify processor faults or communication errors instantly. While Rockwell discontinued this series in 2012, it remains a critical component for maintaining existing infrastructure.
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