Mitsubishi Electric MELSEC iQ-R Series User Manual page 499

Precautions
• 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.
Initial setting
Communication using MC protocol
Communication using nonprocedural/
bidirectional protocols
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)
Setting the unit of data length sent by the on-
demand function
Setting the buffer memory used by the on-
demand function
Setting the unit of data length to be sent and
received
Setting the data send area
Setting the data receive area
Setting item
• "Word/byte units designation" (addresses: 96H/136H)
• "Buffer memory start address designation" (addresses: A0H/
140H)
• "Send buffer memory length designation" (addresses: A3H/143H)
• "Word/byte units designation" (addresses: 96H/136H)
• "Send buffer memory start address designation" (addresses:
A2H/142H)
• "Send buffer memory length designation" (addresses: A3H/143H)
• "Receive buffer memory length designation" (addresses: A7H/
147H)
APPENDICES APPENDIX
Appendix 3 Buffer Memory
A
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