Selecting Ladder Memory Protection - Ti535 Models; Switch Settings - Ti535 L-Memory Protection - Siemens SIMATIC TI525 Hardware And Installation Manual

3.4.6 Selecting Ladder Memory Protection — TI535 Models
Switch 8 on DIP 2 prevents changes to the RLL program in ladder memory. Your
programming unit refers to this switch as a keylock.
Refer to Figure 3-13. Push switch 8 LEFT to prohibit changes to the program.
Push switch 8 RIGHT to permit program editing.
Figure 3-13 Switch Settings — TI535 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 made by 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
PUSH
LEFT
DIP 2
L-Memory
protect on
NOTE
3-16
PUSH
RIGHT
Position Position not
selected selected
Push Left or Right
L-Memory
protect off