APPENDICES APPENDIX
Appendix 3 Buffer Memory
497
A
• Do not write data in the "System area" of the buffer memory.
If data is written to any of the system areas, the programmable controller system may malfunction.
The system area exists in the user area partially, therefore, take caution when reading from/writing to the buffer memory.
• To use the dedicated instructions, change the following initial settings (default values) for data communications by setting
parameters with an Engineering tool, or by executing the CSET instruction in the program.
For details on the registration operation by an Engineering tool, refer to the following section.
Page 422 PARAMETER SETTING
For the CSET instruction, refer to the following manual.
MELSEC iQ-R Programming Manual (Instructions, Standard Functions/Function Blocks)
Initial setting Setting item
Communication using MC protocol Setting the unit of data length sent by the on-
demand function
• "Word/byte units designation" (addresses: 96H/136H)
Setting the buffer memory used by the on-
demand function
• "Buffer memory start address designation" (addresses: A0H/
140H)
• "Send buffer memory length designation" (addresses: A3H/143H)
Communication using nonprocedural/
bidirectional protocols
Setting the unit of data length to be sent and
received
• "Word/byte units designation" (addresses: 96H/136H)
Setting the data send area • "Send buffer memory start address designation" (addresses:
A2H/142H)
• "Send buffer memory length designation" (addresses: A3H/143H)
Setting the data receive area • "Receive buffer memory length designation" (addresses: A7H/
147H)
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