ALLEN BRADLEY PLC (Programmable Logic Controller) -1785-L26B

Allen-Bradley PLC-5 Processors with Protected Memory (1785-L26B, -L46B, L86B, -L46C15)

All enhanced Allen-Bradley PLC-5 processors have memory protection. However, those processors designated as having the memory protection feature have the added capability of limiting access to individual words.

Choose a Allen-Bradley PLC-5 processor with protected memory when access must be limited to critical or proprietary areas of programs, selectively guard processor memory and I/O words, or restrict use of processor operations.

The Allen-Bradley PLC-5 protected memory feature expands system validity and security beyond what is provided by the password-and-privilege capability of the other Allen-Bradley PLC-5 enhanced processors. Custom software protection schemes can be designed for each application.

Rockwell Software programming software can be used to assign class privileges to specific user accounts or a user job function, such as system administrator, plant engineer, maintenance engineer, or operator. Using four privilege classes and associated passwords, access can be limited to critical program areas and restrict access to:

• Communication channels
• Remote nodes attached to a DH+ or ControlNet network
• Program files
• Data files
• Individual data words

The Allen-Bradley PLC-5/26, PLC-5/46, and Allen-Bradley PLC-5/86 protected processors are equivalent to the Allen-Bradley PLC-5/20, Allen-Bradley PLC-5/40, and Allen-Bradley PLC-5/80 standard processors, respectively, plus the added memory protection feature. These processors are listed under the heading “Standard Allen-Bradley PLC-5 Processors with Protected Memories” in the Allen-Bradley PLC-5 Processor selection tables.

The Allen-Bradley PLC-5/46C15 protected processor is equivalent to the Allen-Bradley PLC-5/40C15 ControlNet processor plus the added memory protection feature. This processor is listed under the heading “ControlNet Allen-Bradley PLC-5 Processors with Protected Memories” in the Allen-Bradley PLC-5 Processor selection tables.
For decades the Allen-Bradley PLC-5 system was the most popular of the Allen-Bradley PLC lines. Because it was so reliable and versatile, the PLC-5 has survived the test of time. Qualitrol International provides remanufactured and hard-to-find replacement parts for the Allen-Bradley PLC-5 family. Remanufactured Allen-Bradley PLC-5 parts are a cost-effective alternative to new Allen-Bradley PLC-5 Parts.