Mitsubishi Electric MELSEC iQ-R Series Programming Manual page 1050

Operation error
Error code Description
(SD0)
2820H The module with the I/O number specified by (U) does not have buffer memory.
2823H The module with the I/O number specified by (H) does not have buffer memory.
The address specified by (s) is outside the range of buffer memory or CPU buffer memory.
The (n) points of data starting from the address specified by (s) are not within the range of buffer memory or CPU buffer memory.
(FROM(P) instruction)
The (n)2 points of data starting from the address specified by (s) are not within the range of buffer memory or CPU buffer memory.
(DFROM(P) instruction)
• Module data can also be read using the module access device. ( MELSEC iQ-R CPU Module User's
Manual (Application))
• If refresh settings are not made for the refresh area of the read/write enabled area in the CPU buffer
memory, the area can be used as a read/write specifiable area. Even when refresh settings are made, the
area can be used as a read/write specifiable area in the reference send range and later.
2048
524287
• A CPU buffer memory access device can be used to read data from the CPU buffer memory. ( MELSEC
iQ-R CPU Module User's Manual (Application))
• The FROM(P) and DFROM(P) instructions can read data from the buffer memory address with a capacity of
64K or less. To read data from the buffer memory address with a capacity exceeding 64K, use the
FROMD(P) or DFROMD(P) instruction. ( Page 1054 FROMD(P), DFROMD(P))
7 APPLICATION INSTRUCTIONS
1048
7.27 Module Access Instructions
0
System area
Refresh area
Read/write enabled