Software Manual Freedom EVOware Standard 2.3 Freedom ...

14 - Advanced Programming Features for Scripts
Variables and Expressions in Scripts
14.1.4.16 REPLACE_DITI_SITE
If you are using DITIs, Freedom EVOware provides special facilities to ensure that
sufficient DITIs are present on the worktable for your script or process and to
automatically fetch new DITI racks as and when needed.
For each Get DITI command in your pipetting script, Freedom EVOware
automatically sets the two variables REPLACE_DITI_GRID and
REPLACE_DITI_SITE to the correct grid and site for the selected DITI type before
executing the command.
If your script includes an Activate DITI Handling command and all of the DITIs in
the rack have been used, Freedom EVOware calls the DITI replacement script
which is specified in the command. The replacement script is normally
implemented using one or more Transfer Labware commands
The worktable location of the DITI rack which needs replacing is specified in the
replacement script with the variables REPLACE_DITI_GRID and
REPLACE_DITI_SITE.
These two variables are only used by the automatic DITI handling feature in
Freedom EVOware Standard. Freedom EVOware Plus uses a different concept
for automatic DITI handling.
See 17.1 “Using the Automatic DITI Handling feature”, 17-1) for more
information.
14.1.4.17 SAMPLE_CNT
If you want to write a script which allows a different number of samples in each
run, you would normally need to modify the script each time you use it. The
SAMPLE_CNT counter variable allows you to write a script for the maximum
number of samples which you expect and to limit the script during runtime
according to the actual number of samples. SAMPLE_CNT is intended for use in
loops in combination with basic pipetting commands such as Aspirate, Dispense,
Mix, Get DITIs and Drop DITIs.
This feature is activated by assigning a positive value to SAMPLE_CNT.
If SAMPLE_CNT is set to a value which is greater than or equal to 0, Freedom
EVOware keeps a count of how many different tips are used in each cycle of the
following loop(s). The loop is then terminated the next time End Loop is executed
when the number of tips used reaches SAMPLE_CNT. If SAMPLE_CNT is not a
multiple of the number of tips used in one cycle of the loop(s), Freedom EVOware
modifies the tip selection in the final cycle of the loop.
The following figure shows an example of using the SAMPLE_CNT variable:
Fig. 14-3 Using the SAMPLE_CNT variable
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