Downloading Preset Constants - Ti525 Models; Switch Settings - Ti525 Download/Retain Presets - Siemens SIMATIC TI525 Hardware And Installation Manual

3.3.4 Downloading Preset Constants — TI525 Models
The drum and timer/counter instructions have reserved sections of memory
where preset variables are stored. These variables may be changed with an
operator interface, such as a TCAM or VPU, or with an RLL instruction,
without altering their value in the RLL program. If you cycle power or execute
AUX Function 10 while the battery is enabled, switch 5 on DIP 2 determines
whether the changed values in preset memory are retained or the original
values are downloaded from the RLL program. If the battery is dead, low, or
disabled, the preset values are always downloaded from the RLL program in an
EPROM/EEPROM, if one is installed.
Refer to Figure 3-7. Turn switch 5 ON to have values downloaded from the RLL
program. Turn switch 5 on DIP 2 OFF to have preset values retained.
Figure 3-7 Switch Settings — TI525 Download/Retain Presets
Executing AUX Function 12 (PLC Complete Restart) with your
programming device causes the presets to be downloaded from
the RLL program, regardless of the state of this dipswitch.
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INSTALLATION
OFF ON
Retain
presets
DIP 2
NOTE
3-9
Download
presets
Position Position not
selected selected
Push down
Hardware and Installation User Manual