Mitsubishi MELSEC-A series, Programming Manual

Page: 309 / 508

7. APPLICATION INSTRUCTIONS
7
−
107
MELSEC-A
(1) ASCII code output of 16 characters
1) The number of points used for the output module is 10 points which start at
the Y number specified at (D).
2) The output signal from the output module is sent at 30ms per character.
Therefore, 480ms (=16
×
30ms) is required until 16 characters are sent.
However, since the control during sending is performed by the interrupt
processing at intervals of 10ms, the sequence processing is performed
continuously.
10 points beginning with the Y number specified in D are provided to the
output unit during sequence processing, irrespective of I/O refresh after
END.
3) In addition to the ASCII code, a strobe signal (10 msec ON, 20 msec OFF) is
also output from the device specified at (D) + 8.
4) Until the execution of sending the ASCII code of 16 characters after
execution of the PR instruction, the PR instruction execution flag (device
(D)+9) is ON.
5) Multiple PR and PRC instructions can be used. In such a case, however,
provide interlock by use of the PR instruction execution flag (contact of
device (D)+9) so that the instructions may not turn on at the same time.
Device which store ASCII code
PR instruction execution flag
(used for interlocking)
Sequence
program
Output Y
Strobe signal output
ASCII code output
Printer
or
indicator
Head of
output
Upper 8 bits Lower 8 bits