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7-170
PRC
[Timing Chart]
(2) Output signals from the output module are transmitted at the rate of 30 ms per character.
For this reason, the time required to the completion of the transmission of the designated
number of characters will be 30 ms 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.
(3) In addition to the ASCII code, the output module also outputs a strobe signal (10 ms ON, 20
ms OFF) from the + 8 device.
(4) Following the execution of the PRC instruction, the PRC instruction execution flag ( + 9
device) remains ON until the completion of the transmission of the designated number of
characters.
(5) The PRC instruction can be used multiple times, but it is preferable to establish an interlock
with the PRC instruction execution flag ( + 9 device) so that they will not be ON
simultaneously.
(6) If no comments have been registered at the device designated by , processing will not be
performed.
(7) 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.
Y38
(Strobe signal)
Y30 to Y37
10
ms
10
ms
41
H
42
H
4E
H
AB n
OFF
ON
Y39
OFF
30ms x 16 = 480 ms
43
H
4F
H
OC
10
ms
30 ms
ON
OFF
ON
PRC
SM721
SM720
OFF
OFF
ON
ON
Preprocessing
(several scans)
(Flag indicating strobe
signal is being output)
(File access in
progress flag)
(File access
completion flag)
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.
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
D
D
D
S