Rockwell-automation 1766-Lxxxx MicroLogix 1400 Programmable Controller User Manual download pdf (Page 163)

Rockwell Automation Publication 1766-UM001H-EN-P - May 2014 121

Using Real-Time Clock and Memory Modules Chapter 6

User Program , User Data, Datalog and Recipe Back-up

The memory module provides a simple and flexible program, data, DataLog, and

Recipe transport mechanism, allowing the user to transfer the program, data,

DataLog and Recipe to the controller without the use of a personal computer and

programming software.

The memory module can store one user program at a time.

During program transfers to or from the memory module, the controller’s RUN

LED flashes.

Program Compare

The memory module can also provide application security, allowing you to

specify that if the program stored in the memory module does not match the

program in the controller, the controller will not enter an executing (run or test)

mode. To enable this feature, set the S:2/9 bit in the system status file. See “Status

System File” in the MicroLogix 1400 Programmable Controllers Instruction Set

Reference Manual, Publication 1766-RM001

for more information.

Data File Download Protection

The memory module supports data file download protection. This allows user

data to be saved (not overwritten) during a download.

Memory Module Write Protection

The memory module supports write-once, read-many behavior. Write protection

is enabled using your programming software.

TIP

Data file download protection is only functional if the processor does

not have a fault, size of all protected data files in the memory module

exactly match the size of protected data files within the controller,

and all protected data files are of the same type. See “Protecting Data

Files During Download” in the MicroLogix 1400 Programmable

Controllers Instruction Set Reference Manual, Publication

1766-RM001

.

IMPORTANT

Once set, write protection cannot be removed. A change cannot be

made to the control program stored in a write protected memory

module. If a change is required, use a different memory module.

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