INSTALLATION
3-9
Hardware
and Installation User Manual
3.3.4 Downloading
Pr
eset 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. T
urn switch 5 ON to have values downloaded
from the RLL
program.
T
urn switch 5 on DIP 2 OFF to have preset values retained.
DIP
2
ONOFF
Position not
selected
Position
selected
Push down
Retain
presets
Download
presets
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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