7. APPLICATION INSTRUCTIONS
7 − 108
MELSEC-A
(2) ASCII code output up to 00H code (Unusable with the An and A3V.)
1) The number of points used for the output module is 10 points which start at
the Y number specified at (D).
2) 480ms is required to transmit 16 codes as each code is transmitted 30ms by
the output module (16 × 30ms = 480ms). The PR instruction performs
processings during 10ms interrupts in order of data output, strobe signal on,
strobe signal off. Any other instruction is executed between the processings.
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.
6) If contents of the device which stores ASCII codes are changed while ASCII
codes are output, the changed data are output.
7) If code 00
H is not found in the specified device, operation error occurs.
PR instruction execution flag
(used for interlocking)
Sequence
program
Output Y
Strobe signal output
ASCII code output
Printer
or
indicato
Head of
output
Defines
end of
ASCII
string
Device which store ASCII code
Upper 8 bits Lower 8 bits
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