Siemens SIMATIC TI525 User Manual

INSTALLATION
3-8
Hardware and Installation User Manual
3.3.3 Selecting Ladder Memory Pr otection — 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. T urn
switch 4 OFF to permit program editing.
DIP 2
ONOFF
Position not
Selected
Position
Selected
Push Down
L-Memory
protect of f
L-Memory
protect on
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.
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Siemens SIMATIC TI525 Specifications

General

Brand	Siemens
Model	SIMATIC TI525
Category	Control Unit
Language	English