Siemens SIMATIC TI525 - Selecting Ladder Memory Protection - TI535 Models; Switch Settings - TI535 L-Memory Protection

INSTALLATION
3-16
Hardware and Installation User Manual
3.4.6 Selecting Ladder Memory Pr otection — TI535 Models
Switch 8 on DIP 2 prevents changes to the RLL program in ladder memory . Y our
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.
DIP 2
PUSH PUSH
L-Memory
L-Memory
protect on
protect of
f
Position not
selected
Position
selected
Push Left or Right
LEFT RIGHT
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.
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