APPENDIX
Appendix 9.2 When accessing buffer memory using sequence program
In the following program example, data are read from or written to the buffer memory of the Q series C24 using the REMFR/REMTO instruction.
POINT
Use GX
(1) Program conditions
The following program reads data from or writes data to the QJ71C24N buffer memory (CH1 side word/byte units designation area) when the read/write command (X1020, X1021) turns ON.
(a) Devices used:
• Read/write command.............................................................. | X1020, X1021 |
• Read/write command pulse signal ......................................... | M10, M11 |
• Completion device for REMFR/REMTO instruction .............. | M100 to 103 |
• Normal/abnormal completion flag for REMFR/REMTO |
|
instruction................................................................................ | M200 to 203 |
• Read from word/byte units designation area ......................... | D0 |
• Write to word/byte units designation area.............................. | D1 |
(2) Program examples
(a) Read from buffer memory
<Read command>
Changes the read command into pulses.
Reads the word/byte units designation area data of the buffer memory to D0.
Normal completion of REMFR instruction
Abnormal completion of
REMFR instruction
(b) Write to buffer memory
<Write command>
Changes the write command into pulses.
Sets the word/byte units designation to byte.
Transfers the setting value to the word/byte units designation area of the buffer memory.
Normal completion of REMTO instruction
Abnormal completion of
REMTO instruction
App. - 34 | App. - 34 |