INSTALLATION
3-12
Hardware
and Installation User Manual
3.4.2 Downloading
Pr
eset Constants — TI535 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, without altering their value in the
RLL program. If you cycle power or execute AUX Function 10 or 11 while the
battery is enabled, switch 4 on DIP 1 determines whether values in preset
memory are retained or 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 3-9. T
urn switch 4 ON to have values downloaded
from the RLL
program.
T
urn switch 4 OFF to have preset values retained.
DIP
1
ONOFF
Retain
presets
Download
presets
Position not
selected
Position
selected
Push
down
Figure 3-9 Switch Settings — TI535 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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