Omron NT15S, Operation Manual

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129
Standard Mode
Section 4-8
The destination data set becomes the active data set after it has been copied.
After it has been copied, the name of the destination data set consists merely of
blanks. A new name can be defined with the system variable ActDSName.
4.8.2.4 Deleting a Data Set
Only the active data set can be deleted. To do so, the value 1 is written to the
system variable DSDelete.
The following conditions must be fulfilled in order for the data set to be deleted
successfully:
-
The active data set can not be edited at the same time.
- The data set must be stored in the RAM.
If any of these conditions is not satisfied, the data set is not deleted and a system
error message is output.
After the deletion, the data set with the lowest number in the current recipe
becomes the active data set.
4.8.2.5 Modifying a Data Set
The active data set can be modified, providing it is stored in the RAM.
To change the contents of a data set, the variables must be edited in the recipe
window. Note, however, that the new values are not written in the data set as soon
as the Enter key is pressed, but are first stored in a temporary buffer. The Data
Release key must then be pressed in order to accept them. If the new values are not
to be accepted, the system variable Break can be set to 1 to discard the contents of
the buffer. It is a good idea to program one of the soft keys to this variable, in order to
save time.
Another data set can not be selected until the buffer contents has either been
accepted or discarded.
If the controller changes to a different mask while a data set is being modified, or if
the external data release is cancelled again before the Data Release key is
pressed, the buffer contents will likewise be discarded.
The modified data set is not transferred to the controller automatically. An explicit
command from the operator or the controller is necessary first.
4.8.3 Data Set Transfer to / from a Controller
4.8.3.1 Transfer to a Controller
A data set can be transferred to the controller in the following ways:
-
The active data set can be transferred to the controller by setting the system
variable DSDownload to 1.
- The controller can issue a request for any data set. It first sets the variable
addresses for the recipe and data set numbers to the required values. It then
writes the value 7FFBH to the address of the serial signaling channel (see sec-
tion 4.22
Cyclic Poll Area).