7 Applied Instructions
7.8 External FX I/O Device
370
FXCPU Structured Programming Manual
(Basic & Applied Instruction)
Cautions
1. Limit of number of times of use of command
Only one of HKY command and DHKY command can be used in the program.
If desired to use plural times, you can program by the index modifier (V, Z) function.
2. When keys are pressed simultaneously
When plural keys are pressed, only the first pressed key is valid
3. When command contact is turned OFF
If turned OFF, the content of is not changed, but all of to +7 are turned OFF.
4. Number of bits occupied
1) To occupy 4 points for connecting 16 keys from the beginning device of input (X).
2) To occupy 4 points for connecting 16 keys from the beginning device of output (Y).
3) To occupy 8 points from beginning device for output of key pushing information.
Be careful not to overlap with the device used in control of the machine.
- to +5 : Key pushing information of keys A to F
- +6 : Key sense output of keys A to F.
- +7 : Key sense output of keys 0 to 9
5. Intake timing of key input
HKY and DHKY commands are executed simultaneously with the operation period of PLC.
At the end of a series of key scan, a time of 8 scans is needed.
To prevent intake error due to filter delay of key input, you can utilize the function of "constant scan mode" or
"timer interruption."
6. Output format
Select and use the PLC of transistor output type.
7. Designation of input and output variables
When handling 32-bit data in a structured program, you cannot designate 16-bit device directly unlike in
simple project. When handling 32-bit data, please use the label. However, the 32-bit counter is a device of 32
bits long, and the device can be designated directly. When designating the device, please use the global
label.
8. Object devices are limited.
S1: FX3U, FX3UC PLCs only are applicable.
However, index modifier (V, Z) is not applicable.
S2: FX
3U, FX3UC PLCs only are applicable.
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