Selecting Ladder Memory Protection - Ti525 Models; Switch Settings - Ti525 L-Memory Protection - Siemens SIMATIC TI525 Hardware And Installation Manual

3.3.3 Selecting Ladder Memory Protection — TI525 Models
Switch 4 on DIP 2 prevents modifications to the RLL program in ladder memory.
Your programming unit refers to this switch as a keylock.
Refer to Figure 3-6. Turn switch 4 ON to prohibit changes to the program. Turn
switch 4 OFF to permit program editing.
Figure 3-6 Switch Settings — TI525 L-Memory Protection
Turning the L-memory protect switch on does not prevent
forcing I/O, changing variable memory, or switching the PLC
from PROGRAM to RUN mode. These actions may be initiated
with a programming device connected to the PLC, or a special
function I/O module designed for this type of interface to the
PLC, e.g., a Network Interface Module.
The RLL can also be changed through a special function
module, even when the memory protection is enabled with the
keylock. Do not depend upon this switch to prevent personnel
from interrupting your process.
Hardware and Installation User Manual
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INSTALLATION
OFF ON
L-Memory
protect off
DIP 2
NOTE
3-8
L-Memory
protect on
Position Position not
Selected Selected
Push Down