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FX3G/FX3U/FX3GC/FX3UC Series
Programming Manual - Basic & Applied Instruction Edition
15 External FX I/O Device – FNC 70 to FNC 79
15.8 FNC 77 – PR / Print (ASCII Code)
Cautions
1. Command input and instruction operation
While the command input is ON: Even if the command input is continuously ON, execution is completed after a
series of outputs.
M8029 turns ON when the command input turns OFF after M8027 turns ON and
execution is completed.
While the command input is OFF: All outputs are OFF.
2. Relationship with the scan time (operation cycle)
This instruction is executed in synchronization with the scan time.
If the scan time is short, the constant scan mode can be used. If the scan mode is too long, the timer interrupt function
can be used.
3. Output type of the PLC
Use a transistor output type PLC.
4. When "00H (NULL code)" is contained in the data (while M8027 is ON)
The instruction is executed completely, and the data after "00H" is not output.
M8029 remains ON during one operation cycle.
5. Limitation in number of instructions
The PR instruction can only be executed twice in a program.
If it is necessary to use the PR instruction 3 times or more, use the indexing (V, Z) function in programming.
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