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STE 58760
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3-26
3.4 SETTING EXTERNAL SELECTION FILES
To select a file to be executed using external input signals, the name of the file should have first
been registered in the external selection file (EXTRNSEL. SYS). This paragraph describes the
contents of the external selection file. For details of how to create and change this file, see 3.2,
"Changing File Data".
Note)
To select a file to be executed from outside of the controller, it is necessary to specify an input
signal line to be used for selecting the file as well as creating the external selection file. For
details of the system configuration file, see 3.3, "Setting System Configuration".
3.4.1 Signals Used for Selecting File
To select a file, use a signal having up to 8 consecutive signal points among 32 input signal
points. Signals used to select a file are specified in the system configuration file. Change
the data line corresponding to the file selection signal line in the system configuration file in
accordance with the signals to be used.
Example)
When using the 6 points (extending from points 10 to 15) of an input signal, change the data
line of the system configuration file as follows.
[9.]SPECIFY FOR EXTERNAL FILE SELECTION SIGNAL
[1<=CH.NO. <=24,1<=LENGTH<=8]
= 10 6
To actually select a file, take the timing using a strobe signal and acknowledge signal. For
details of the signal timing for selecting a file, see the Interface Manual.
Any signal used for selecting a file is read in as a file selection number. The file selection
number is one digit numeric value in binary notation representing the conversion of the state of
each input signal being specified. The smallest input signal number of the input signals being
specified is treated as bit 0, and, in order, each bit corresponds with its input signal number.
The ON and OFF states of each signal correspond with 1 and 0, respectively.