Allen-Bradley MicroLogix 1100 Instruction Set Reference Manual

Publication 1763-RM001C-EN-P - October 2009
42 Controller Memory and File Types
Protecting Data Files
During Download
Data File Download Protection
Once a user program is in the controller, there may be a need to update
the ladder logic and download it to the controller without destroying
user-configured variables in one or more data files in the controller. This
situation can occur when an application needs to be updated, but the data
that is relevant to the installation needs to remain intact.
This capability is referred to as Data File Download Protection. The
protection feature operates when:
• A User Program is downloaded via programming software
• A User Program is downloaded from a Memory Module
Setting Download File Protection
Download File Protection can be applied to the following data file types:
• Output (O)
• Input (I)
• Binary (B)
• Timer (T)
• Counter (C)
• Control (R)
• Integer (N)
• Floating Point (F)
• String (ST)
• Long Word (L)
• Proportional Integral Derivative (PD)
• Message (MG)
• Programmable Limit Switch (PLS)
• Routing Information (RI)
• Extended Routing Information (RIX)
TIP
The data in the Status File cannot be protected.
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Allen-Bradley MicroLogix 1100 Specifications

General

Brand	Allen-Bradley
Model	MicroLogix 1100
Category	Controller
Language	English