Mitsubishi MELSEC-A series, Programming Manual

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7. APPLICATION INSTRUCTIONS
7
−
109
MELSEC-A
PRC
(1) Outputs the comment (ASCII code) of the device specified at (S) to the output
module specified at (D). The number of points used for the output module is
eight 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
×
30 ms=480 ms). The PRC instruction performs process-ings
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 PRC instruction, the PRC 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 PRC instruction execution flag (contact of device
(D) +9) so that the instructions may not turn ON at the same time.
PRC instruction execution flag
(used for interlocking)
ASCII code output
Strobe signal output
Output Y
Printer or
indicator
Comment of
×
1
Head of output
Sequence
program