Appendix G MSG-SND/MSG-RCV Functions (Ethernet)
G.1 Message Transmit Function (MSG-SND)
A-76
( 9 ) Remote CPU Number (PARAM07)
Refer to G.1.4 Function Setting and Parameter Details for MEMOBUS and Extended MEMOBUS Protocols.
( 10 ) Offset (PARAM08 to PARAM11)
Specify the offset addresses of the read data storage area and the write data source of the transmission side.
The address for the transmission side will be displaced by the number of words designated by the offset.
Note: 1. For more information, refer to G.1.8 Relationship between Data Address, Data Size, and Offset for
MSG-SND Function.
2. The offset cannot be a negative value.
The offset parameter is prepared for each target data type.
The following table lists the offset parameters.
The valid offset parameter may differ, depending on the function code.
The following table lists the valid parameters for each function code.
( 11 ) Reserved by System 1 (PARAM12)
Used by system (the channel number of communication buffer in use is stored).
Note: At the first scan during power up, make sure to set it to “0” by using the user program. After that, the reg-
ister is used by system. Do not change the value thereafter with the user program.
( 12 ) Reserved by System 2 (PARAM13 to PARAM16)
Used by system. Never change the value with the user program, etc.
Table G.15 Offset Parameter List
Parameter Contents Description
PARAM08 Coil offset Sets the coil’s offset word address.
PARAM09 Input relay offset Sets the offset word address of an input relay.
PARAM10 Input register offset Sets the offset word address of an input register.
PARAM11 Holding register offset Sets the offset word address of a holding register.
Table G.16 Valid Parameter List for Offset of Each Function Code
Function Code Function
Valid Offset
Parameter
01H Reads coil state
PARAM08
02H Reads input relay state
PARAM09
03H Reads holding register content
PARAM11
04H Reads input register content
PARAM10
05H Changes single coil state
PARAM08
06H Writes to single holding register
PARAM11
0FH Changes multiple coil states
PARAM08
10H Writes to multiple holding registers
PARAM11
16H Mask writes to holding register
PARAM11
17H Reads/Writes multiple holding registers
PARAM11
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