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7 APPLICATION INSTRUCTIONS
7.9 Display Instructions
[Timing Chart]
• Output signals from the output module are transmitted at the rate of 30ms per character. For this reason, the time required
to the completion of the transmission of the designated number of characters will be 30ms n (ms). At 10ms interrupt
intervals, the PRC instruction executes data output, strobe signal ON, and strobe signal OFF. The other instructions are
executed continuously during a period between the above processings.
• In addition to the ASCII code, the output module also outputs a strobe signal (10ms ON, 20ms OFF) from the (D)+8 device.
• Following the execution of the PRC instruction, the PRC instruction execution flag ((D)+9 device) remains ON until the
completion of the transmission of the designated number of characters.
• The PRC instruction can be used multiple times, but it is preferable to establish an interlock with the PRC instruction
execution flag ((D)+9 device) so that they will not be ON simultaneously.
• If no comments have been registered at the device designated by (S), processing will not be performed.
• When a comment is read, SM720 turns ON for one scan after the instruction is completed. SM721 turns ON during the
execution of the instruction. The PRC instruction cannot be executed while SM721 is ON. If the attempt is made, no
processing is performed.
10
ms
10
ms
41H 42H 4EH
AB N
OFF
ON
OFF
30ms × 16 = 480ms
43H 4FH
OC
10
ms
30ms
ON
OFF
ON
OFF
OFF
ON
ON
Y38
(Strobe signal)
Y30 to Y37
Y39
(Flag indicating strobe signal
is being output)
SM721
(File access in progress flag)
SM720
(File access completion flag)
Preprocessing
(several scans)
None of
instructions can
be executed.
PRC instruction cannot be executed again.
Instructions other than PRC instruction (SP.FREAD, SP.FWRITE,
PUNROAD, PLOAD, PSWAPP) can be executed.
PRC
Strobe signal
OFF
ON
30 ms
10 ms 10 ms
10 ms
10 ms 10 ms
Data output
Execution of sequence program
Processing of PRC instruction
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